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  • 1.
    Albo Zieme, Louise
    et al.
    Jönköping University, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    Bergstedt, Pontus
    Jönköping University, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    A pre-study for functional coatings evaluated on light metals to be applied on a new HPDC Mg-alloy: Investigating tribological and thermophysical properties, as-cast and coated2021Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Magnesium with two-thirds of the density compared to aluminium and one-quarter of steel, intrigues product developers and material scientists due to the light metal’s excellent combination of strength to weight ratio as well as their capability of being produced as a High Pressure Die Cast component compared to other ferrous or light metal alloys.

     

    However, a magnesium alloy inherits some concerning drawbacks, limiting the exploitation in structural applications and mechanical design such as automotive, heavy machinery and aerospace components. The need for a magnesium alloy that could withstand a sufficient amount of wear, temperature and corrosive environment, leads towards the investigation and evaluation of a suitable, functional coating as a solution to exploit the evident advantages a magnesium alloy exhibits. A substantial amount of research is required in order to reduce an existing knowledge gap that is the ongoing development in the search for a sufficient functional coating and adherence capability to the highly reactive substrate that is a magnesium alloy.

     

    This industrial master thesis is an early stage investigation to evaluate how the currently used aluminium substrate with an electrodeposited coating relate and compares to a heat-treated electroless deposited coating through tribological and thermophysical induced stresses. These properties are tested with proven industrial standard methods resulted in a comprehensive conclusion and discussion regarding the feasibility of applying the coating onto a commercial magnesium alloy closely related to the Mg-alloy developed by Husqvarna and thereby contributing to technological advances to the highly relevant topic within product development in materials engineering.

    Fulltekst (pdf)
    A pre-study for functional coatings evaluated on light metals to be applied on a new HPDC Mg-alloy
  • 2.
    Gonapati, Santosh Reddy
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    Talur Chandrashekar, Gnanesh
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    On the possibility to increase the maximum operating temperature(MOT) of Al-20%SiC composites for wear friction and thermophysical properties.2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Aluminium is one of the prominent metals used in the automobile industries apart from cast-iron. Aluminium is used for lightweight material properties and, it meets some of the prominent mechanical properties. When aluminium is combined with silicon carbide, it improves some of the mechanical properties and provides similar strength as that of the cast-iron. The purpose of aluminium silicon carbide is to recover some of the mechanical properties and the thermal properties for the disc brakes. Aluminium is enhanced with 20% silicon carbide is cast using stir casting. In this paper, two different compositions are compared. The hardness of the samples was analyzed with the help of the Nano-indentation test. Alloy-1 shows better hardness values compared to Alloy-2. The scratch resistivity of the sample surfaces was analyzed under the microscope with the help of the Nano-scratch test. The presence of SiC particles in the aluminium matrix withstands the indenter to penetrate deep into the surface.

  • 3.
    Gustafsson, Tim
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Jansson, Johan
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Development and Implementation of an Anisotropic Material Model based on the Fibre Orientation in GFRPs2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Based on the fibre orientation distribution of a glass fibre reinforced polymer (GFRP) an anisotropic material model is developed and implemented in the commercial Finite Element code LS-Dyna. The material model is coupled with the fibre orientation extracted from flow filling simulations performed in Moldex3D. Central mathematical models used are the Eshelby-Mori-Tanaka model for calculating a composites effective stiffness, Advani and Tucker’s orientation averaging method for considering the fibre orientation tensors, a Lagrange polynomial controlled radial return algorithm for the application of nonlinear hardening and finally Hashin’s damage initiation criterion to establish the initiation and evolution of damage. The material model is calibrated by adjusting Lagrange polynomial data points, until the simulation response corresponds to that of experimental tensile tests. Two different glass fibre reinforced composites are evaluated, and it is concluded that the model can capture the behaviour of the experimental curves with high accuracy. By validation against experimental results, it is shown that the material model performs well. The model is also compared to other advanced commercial material modelling software’s.

  • 4.
    Jammula, Chaitanya Krishna
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design. Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Correlating the microstructure with wear properties of aluminium silicon carbides2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Aluminium is one of the metals playing a prominent role in automobile industry after cast iron. Because of its light weight property and good mechanical properties. When aluminium reinforced with silicon carbide showing good tribological properties and improved strength. Aluminium silicon carbide needs some good wear and frictional properties to use it as break disc. Aluminium reinforced with 15% and 20% silicon carbide and casted in two different ways, liquid casting and stir casting. Four different composites are compared in this paper. Hardness test was carried out on the samples. Increase in the Vickers hardness with increase in silicon carbide reinforcement for both the castings is observed. Rockwell C hardness is showing decreasing trend with increase in SiC reinforcement. The scratch resistance of the surface under micro level was analysed with the help of nano scratch test. The SiC particles in the aluminium matrix are resisting the indenter from deep deformation of the surface. Frictional forces are dropped whenever the indenter met the SiC particles. In other cases, SiC particles are deforming the aluminium matrix in the form of broken particles. The plastic deformation of aluminium is observed, and material is piled up on sideways of groove at high load.Sliding wear behaviour of the composites are investigated by means of reciprocating pin on plate wear rig. The test was carried out at load of 20N for five different sliding duration. Aluminium with 20% silicon carbide of liquid casting is used as a base metal. The worn-out surface of the samples is analysed in SEM. The metallography of the worn-out samples is showing some deep grooves and abrasion of the material. Wear debris from both the surfaces are forming into a cluster of layers. These layers are protecting the surface from wear in some areas were observed. Composition of tribo layer formed during the test was investigated with the help of EDS analysis. The tribo layer are rich in aluminium and silicon elements because both the samples are made of aluminium silicon carbide.

    Fulltekst (pdf)
    Correlating the Microstructure with Wear Properties of Aluminium Silicon Carbide
  • 5.
    Jansson, Anton
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Pejryd, Lars
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Surface vs Truss lattice networks, benefits and limitations2018Inngår i: NAFEMS nordic: Exploring the Design Freedom of Additive Manufacturing through Simulation, NAFEMS , 2018, s. 217-218Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The use of additive manufacturing is growing rapidly among industries within many different fields of fabrication. The benefits of applying additive manufacturing can be many and an application that have received special interest is the ability to design lightweight components. Lightweight components can be fabricated with additive manufacturing with the use of lattices that have a high stiffness to weight ratio and topology optimised, complex, designs. The most commonly used lattices today are based on trusses, however, there is also the possibility to generate lattices based around continuous surfaces. In this study, the properties of the popular body-centred-cubic lattice are compared the properties of the lesser known Schwartz diamond surface lattice. The mechanical compression properties, the fabrication processes, and the possibilities of the lattices are discussed and analysed.

  • 6.
    Jarefalk, Lina
    et al.
    Jönköping University, Tekniska Högskolan.
    Dahlin, Emilia
    Jönköping University, Tekniska Högskolan.
    Multikriterieanalys av samverkanskonstruktioner2020Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Fulltekst (pdf)
    fulltext
  • 7.
    Manjunath, Tushar
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    Nixon, Nirmal
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    On the Possibility to Increase Maximum Operating Temperature (MOT) of Al 20%SiC Composites for Mechanical Properties2020Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The main objective of this project is to seek the possibility to increase the maximum temperature, to improve mechanical properties and also analyse the microstructure of Al-20%SiC composite by manipulating its transition metals using four different additions of Zr, Ni, Si, Ti, Mg, Mn, Cr, Fe and Cu and conduct tensile and compression test to find out the mechanical properties of the composite of Brake Discs at ambient and elevated temperatures as company’s requirements(AC Floby) the casting will be done using vertical high pressure die casting process at Jönköping University which is collaborated with AC Floby for the materials and machining. The tensile and compression tests were conducted at Jönköping University in accordance to standard ASTM B557M for standard tension test of metals at room temperature and ASTM E21 for the tensile test of metal at elevated temperature, ASTM E9 for compression test.

    The scope of this project is to obtain stronger brake discs that can withstand high temperature and loads, to reduce vehicle’s weight and emissions by using the Al-20%SiC alloy since it has low density, high thermal conductivity, good corrosion resistance, strength and wear property.

    This project is part of a large project which was done by the next group that handles with the possibility to increase the maximum operating temperature of Al-20%SiC alloys to obtain wear friction and thermal physical properties. Hence, this gives the opportunity to understand the mechanical properties and thermal physical properties of the same newly developed Al-20%SiC alloys that is shared with the other group to validate the outcome of compositions of alloy 1 and alloy2 used in the project and compare between the two alloys. The operating temperature will rise, and the alloy strength falls due to elevated temperature and other microstructure defects hence our aim is to make the properties of alloy sustain at elevated temperature and reduce coarsening and wear in Brake Discs. Hence, we initiated by narrowing down the additions into the metal matrix Aluminium by using Thermo calc software to study the effect of each element on the Aluminium and the binary phase diagram of each alloying element in aluminium primary matrix. And to determine the effect of reinforcing SiC particles that provides strength, tensile and compressive properties at elevated temperature and came up with the satisfying additions for the alloy which will be explained further below in the report. A validation of the alloy was carried out against the tensile and compression experimental results to evaluate the predictive and better properties of the newly developed alloy for brake discs by comparing with the alloy 1 and alloy 2 compositions.

     

  • 8.
    Manne, Akhil
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Hiregoudra, Pramod S
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Modelling and Simulation of Mold filling in gravity casting of Aluminium and MMC alloys.2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Download (pdf)
    Abstract-Master Thesis
  • 9. Mohammadpour Kasehgari, Saba
    Castability and Thermophysical Properties of Aluminum Matrix Composites with Varying SiCp Additions2023Independent thesis Advanced level (degree of Master (Two Years)), 80 poäng / 120 hpOppgave
    Abstract [en]

    The present study investigates the castability and thermophysical properties of aluminum Metal Matrix Composite (Al-MMC) reinforced with varying silicon carbide particle (SiCp) contents. The composite materials with increasing fractions of SiCp from 10 to 30 wt.% were produced by casting to implement the measured data as input for the material database of the casting simulation of a brake rotor. In this regard, material properties like thermal diffusivity, thermal expansion, and specific heat capacity were evaluated for the investigated materials. In addition, the data of specific heat capacity, density, and thermal conductivity as a function of temperature accompanied by thermal arrest points captured by computer-aided cooling curves (CACC) were imported into the simulation software to create a new dataset for Al-MMC/SiCp with varying compositions. The improvement of the new simulation using the adapted material database in filling, solidification, and defect prediction was validated by microstructure analysis and comparison between the previous and the new simulation version.

  • 10.
    Pakkam Gabriel, Vivek Richards
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    FATIGUE MODEL: Stiffness prediction of damaged laminates based on the concept of damaged layers' effective stiffness2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Despite composite materials are widely used in many applications, prediction on damage mechanism of the composite materials is still very difficult. Using the findings from the research on damage mechanism under fatigue loading, its transverse cracking and its crack opening and sliding displacement, a mathematical model has been developed. The model showed results closer to the real-time experimental results in crack initiation and growth. The aim of the thesis is to develop a computational tool using the mathematical model and effective stiffness concept of the layers with cracks to predict the degradation of the longitudinal young’s modulus and shear modulus of the composite laminate. In addition to that, graphical user interface is also created making the user control the tool easily. The tool developed shows promising results but still lacks the information on the effects of delamination on crack opening displacement and effective shear modulus.

  • 11.
    Puthukuttyparambil Ravi, Vishnu
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    Varghese, Antony
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    Comparing the mechanical properties and tribological behaviour of squeeze cast Al-20%SiC and hypereutectic Al-Si alloy2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    For the booming automobile industry, the demand for the light weight and more efficient materials are increasing day by day. Grey cast irons have been playing a crucial role in the manufacturing of the disc brake rotors. But the material of grey cast have many drawbacks such as the weight, and corrosion factors, which will have a great influence on meeting the market demands and also from the environmental point of view. Aluminium plays a vital role in meeting these demands for the growing industry, but the metal aluminium has its own limitations and then arise the demand for the alloying elements. The alloying elements considered in the current thesis work are the Al-20%SiC and the Al-Hypereutectic alloy. The Al-20%SiC alloy is currently used by the manufacturer for the production of their lightweight disc brakes and it is currently manufactured with the process of squeeze casting. The metal exhibits better mechanical properties and other factors that the manufacturer look into. But as the industry is growing in a rapid phase and there is an increasing demand for more reliable alloying elements. The manufacturer considers about the usage of Al-hypereutectic alloy to replace the usage of Al-20%SiC alloy. The current thesis work is focused on the study of the mechanical properties and tribological behaviour of both of these alloys and to verify, if the new alloy can meet the demands of the manufacturer.

  • 12.
    Sarius, N.G.
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Lauridsen, J.
    Thin Film Physics Division, Department of Physics, Chemistry, and Biology, IFM, Linköping University, Linköping, Sweden .
    Lewin, E.
    Department of Materials Chemistry, The Ångström Laboratory, Uppsala University, Uppsala, Sweden .
    Jansson, U.
    Department of Materials Chemistry, The Ångström Laboratory, Uppsala University, Uppsala, Sweden.
    Högberg, H.
    Thin Film Physics Division, Department of Physics, Chemistry, and Biology, IFM, Linköping University, Linköping, Sweden.
    Öberg, Å.
    ABB Corporate Research, Västerås, Sweden .
    Sarova, G.
    Harting, Corporate Technology Services, Espelkamp, Germany .
    Staperfeld, G.
    Harting, Corporate Technology Services, Espelkamp, Germany.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Eklund, P.
    Thin Film Physics Division, Department of Physics, Chemistry, and Biology, IFM, Linköping University, Linköping, Sweden.
    Hultman, L.
    Thin Film Physics Division, Department of Physics, Chemistry, and Biology, IFM, Linköping University, Linköping, Sweden.
    Contact Resistance of Ti-Si-C-Ag and Ti-Si-C-Ag-Pd Nanocomposite Coatings2012Inngår i: Journal of Electronic Materials, ISSN 0361-5235, E-ISSN 1543-186X, Vol. 41, nr 3, s. 560-567Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ti-Si-C-Ag-Pd and Ti-Si-C-Ag nanocomposite coatings were deposited by direct-current magnetron sputtering on Cu substrates with an electroplated Ni layer. Analytical electron microscopy, x-ray diffraction, and x-ray photoelectron spectroscopy show that the nanocomposites consist of TiC, Ag:Pd, and amorphous SiC. The contact resistance of these coatings against a spherical Au-Co surface was measured for applied contact forces up to 5 N. Ti-Si-C-Ag-Pd coatings with Ag:Pd top coating had ~10 times lower contact resistance at contact forces below 1 N (~10 mΩ at ~0.1 N), and 2 to 3 times lower for contact forces around 5 N (<1 mΩ at 5 N), compared with the Ti-Si-C-Ag coating.

  • 13.
    Sarius, N.G.
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Lauridsen, J.
    Thin Film Physics Division, Department of Physics, IFM, Linköping University, Linköping, Sweden.
    Lewin, E.
    Department of Materials Chemistry, The Ångström Laboratory, Uppsala University, Uppsala, Sweden.
    Lu, J.
    Thin Film Physics Division, Department of Physics, IFM, Linköping University, Linköping, Sweden.
    Högberg, H.
    Thin Film Physics Division, Department of Physics, IFM, Linköping University, Linköping, Sweden.
    Öberg, Å.
    ABB Corporate Research, Västerås, Sweden.
    Ljungcrantz, H.
    Impact Coatings AB, Linköping, Sweden.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Eklund, P.
    Thin Film Physics Division, Department of Physics, IFM, Linköping University, Linköping, Sweden.
    Hultman, L.
    Thin Film Physics Division, Department of Physics, IFM, Linköping University, Linköping, Sweden.
    Ni and Ti diffusion barrier layers between Ti-Si-C and Ti-Si-C-Ag nanocomposite coatings and Cu-based substrates2012Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 206, nr 8-9, s. 2558-2565Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Sputtered Ni and Ti layers were investigated as a diffusion barrier to substitute electroplated Ni between Ti–Si–C and Ti–Si–C–Ag nanocomposite coatings and Cu or CuSn substrates. Samples were subjected to thermal annealing studies by exposure to 400 °C for 11 h. Dense diffusion barrier and coating hindered Cu from diffusing to the surface. This condition was achieved for electroplated Ni in combination with magnetron-sputtered Ti–Si–C and Ti–Si–C–Ag layers deposited at 230 °C and 300 °C, and sputtered Ti or Ni layers in combination with Ti–Si–C–Ag deposited at 300 °C.

  • 14.
    Staaw, Fredrik
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Rappner Ståhlkrantz, Filip
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Produktutveckling.
    Förstudie för fjädringsanordning på el-moped2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Arbetet har genomförts på tio veckor och har gått ut på att ta reda på om det är lämpligt att använda sig av fiberkomposit i en fjädringsanordning på en el-mopeds bakhjul. Detta i syfte att sänka fordonets vikt. Om det är lämpligt att använda sig av dessa material är en svår fråga som måste behandlas och vinklas på olika sätt. Det finns säkerhetsaspekter att ta hänsyn till men även miljö och hållbarhet. För att hitta material som klarar av de belastningar konstruktionen kommer utsättas för gjordes intervjuer och även litteraturstudier i cykler som sedan upprepades. Kraven som ställs på konstruktionen är dels att den ska klara av yttre störfaktorer såsom fukt, UV-ljus men självklart även de belastningar som uppstår under färd d v s acceleration, inbromsning, kurvtagning osv. Kraven som bör ställas på konstruktionen är att den ska vara tillräckligt böjstyv för att ta upp krafter men ändå kunna fjädra. Den bör även vara vridstyv vid kurvtagning. Fjädringens slaglängd kan, enligt en konkurrentanalys, variera mellan 44-100 mm. Den beror dock på hur konstruktionen kommer se ut och vikten på fordonet med förare. Samtliga material som hittades i CES (en materialdatabas) har högre sträckgräns än ett allmänt fjäderstål. Även tillverkningsmetoderna togs fram i CES utifrån de material som hittades. Materialen utvärderades mot varandra i en Pugh-matris för att få en rangordning, detsamma gjordes för tillverkningsmetoderna. Materialen och tillverkningsmetoderna poängsattes efter sin rangordning och stämdes därefter av vilka som kan använda vilka tillverkningsmetoder. Den slutgiltiga rangordningen visar vilka material som är mer och mindre mångsidiga när det gäller tillverkningsmetoder. Även två vanliga fjädringstyper jämfördes ihop med tillverkningsmetoder för att undersöka vilka metoder som kunde ta fram dessa geometrier

    Fulltekst (pdf)
    fulltext
  • 15.
    SUNIL, SOORAJ
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Numerical  Tool to Simulate Forming of Lamera HybrixTM2019Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Composite materials are playing an essential role in construction industries, automobile industries, and mechanical industries which have better physical properties than original materials. Hybrix material is a kind of Composite sandwich material which have better properties like lightweight, durable, eco-friendly than original material. In an attempt to prove the quality in finite element analysis Hybrix material, creating a numerical tool to simulate the metal forming conditions. Spring back effect and residual stress are also taken into account in the method.

    Fulltekst (pdf)
    fulltext
  • 16.
    Tolf, Anders
    et al.
    Jönköping University, Tekniska Högskolan, JTH, Material och tillverkning.
    Johannesson, Markus
    Jönköping University, Tekniska Högskolan, JTH, Material och tillverkning.
    Characterization of Fiber Orientation and Weld Line Effects in Reinforced Plastics with Reduced CO2eq Emissions2022Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    With increasing emphasis and regulations on the environmental footprint in industries, the integration of reduced carbon dioxide equivalent (CO2eq) plastic materials is desirable. Fiber-reinforced plastic materials mechanical properties differ with varying fiber orientations. Similarly, the welding line phenomenon, commonly present in more complex injection molded parts, decreases the mechanical performance. This thesis aims to experimentally investigate tensile behavior on reduced CO2eq reinforced plastics in different fiber orientations and weld line configurations. 

    Ten materials with reduced CO2eq are investigated, the types of materials are as follows: PA6 (Polyamide6), PP (Polypropylene), and PA6/PP blend materials. Both short fiber-reinforced polymers (SFRP) and long fiber-reinforced polymers (LFRP) are investigated. The screening resulted in three selected materials for further investigation: one recycled PA6, one bio-based PA6/PP, and one alternative PP. The further investigation involves tensile testing in the five directions and three weld line configurations with non-standardized geometry specimens punched out from an injection molded plate with controlled fiber orientation. Two types of uniform fiber orientation plates are manufactured for the testing conditions, one with holes for weld line testing and one without for testing of orientation. The evaluated fiber orientations are 0° (fibers parallel to load direction), 22.5°, 45°, 67.5°, and 90° (fibers transverse to load direction). The weld line configuration consists of three consecutive holes with 96.5, 146.5, and 196.5 mm distances from the gating system. Three weld line test specimens are generated from each plate, they are denoted W1, W2, and W3 from their respective distance from the gating system, with W1 being closest to the gate. Optical microscopy of fiber orientation and failure modes for the test specimens are performed to investigate and validate the testing conditions. 

    Varying fiber orientation was found to greatly affect the stress-strain behavior in all four materials investigated. The tensile strength was reduced from longitudinal to transverse fiber orientation, with the most significant reduction near flow direction. High variations were present for the brittle materials supposedly from their weakness to stress concentrations. Strain tended to increase from the lowest at 0° to the maximum at 45°, from which it again decreased to a mid-value at 90° for all materials. The weld line strength reduced significantly for the brittle materials, whereas the ductile materials experienced a much smaller reduction. The three weld line cases failed at similar stresses, while having different stiffness.

    Fulltekst (pdf)
    Characterization of Fiber Orientation and Weld Line Effects in Reinforced Plastics with Reduced CO2eq Emissions
  • 17.
    Wahab, Abdul
    et al.
    Jönköping University, Tekniska Högskolan, JTH, Logistik och verksamhetsledning.
    Kessler, Carl
    Jönköping University, Tekniska Högskolan, JTH, Logistik och verksamhetsledning.
    Eco-Friendliness Assessment Of Primary Food Packaging: A case study to assess relevant criteria and evaluate packaging options for sustainable development.2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Purpose: The purpose of this thesis is to investigate how food start-ups (FS) can make their primary food packaging (PFP) more eco-friendly by identifying and evaluating the performance of suited packaging alternative. The purpose was fulfilled by answering the three research questions: 

    RQ1) How to assess the eco-friendliness of PFP?

    RQ2) Which are areas of improvement in environmental performance?

    RQ3) What are the differences in performance across similar PFP’s? 

    Methods: To answer the research questions both the literature review and empirical data was required. The literature study was conducted to gather relevant theories about primary food packaging in food start-ups. To get the required empirical data, a single case study was conducted at a case company that suited the subject. The case study consisted of multiple interviews and document study. This enabled for an analysis in the form of pattern matching in order to answer the research questions and achieve the purpose. 

    Findings: The Study found that to assess the PFP that have direct impact on the environment the functional features and the environmental framework play a central role in the eco- friendliness of PFPs which analyzed the requirements for the PFP and a multi criteria decision making approach for the environmental assessment for the Green-PE. The stakeholder expectations were found by analyzing the criterion for the PFP. In addition, a comparison for an eco-friendlier alternative was analyzed with the current Green-PE to justify the performance for the PFP in FS. 

    Implications: The study results present practical implications with assessing the current Green-PE and evaluating the gaps for improvement areas, while also comparing similar PFP which is an eco-friendlier option for food packaging start-ups. As there has been no general theoretical implications, the findings of the thesis can be used as a basis for deeper insights into the subject through more extensive research. 

    Delimitations & Scope: The focus was to identify and evaluate the current PFP environmental impact and not the other aspects of the life cycle assessment since the scope was limited. Also, a single case study was used rather than multiple case studies to analyze the eco-friendliness for PEPs. 

    Fulltekst (pdf)
    fulltext
  • 18.
    Zoltán Kristóf, Molnár
    Jönköping University, Tekniska Högskolan, JTH, Material och tillverkning.
    Investigation of the mechanical effects of recycling post-industrial and post-consumer glass-filled Polyamide-62024Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis investigates the challenges and opportunities of recycling PA6-GF30, a glass-filled polyamide, to address the pressing environmental concerns surrounding polymer waste. Through a collaboration between Thule Group and Jönköping University, it aims to understand how the properties of recycled materials evolve over time and reprocessing cycles, proposing practical methods for their utilization in sustainable manufacturing practices.

    Thule Group's commitment to reducing emissions entails transitioning to sustainable materials, particularly through increased use of recycled engineering materials like PA6-GF30, to lower the carbon footprint of products, emphasizing the importance of maintaining product quality and safety while exploring the effects of recycled materials on mechanical properties.

    Through producing and testing post-industrial and post-consumer samples added to virgin PA6-GF30 with varying ratios, comparison with the commercially available polymers was conducted. In total, 15 different mixtures of pellets of different quantity and quality of recycled composites were investigated with tensile test and impact test, moreover the fibers of some batches were filtrated from the matrix and the fiber aspect ratio was examined with the help of an optical microscope.

    Results illustrated that recycled polymers generally showed more mechanical property degradation as the ratio of recycled polymers were increased. Furthermore, adding the same amount of post-consumer regrinds as opposed to post-industrial was more detrimental to the overall mechanical performance. Post-industrial composite regrinds performed 11,3% worse in UTS, meanwhile post-consumer regrinds dropped by 25,5% in the same characteristic when the samples made of 100% recycled materials were compared to the virgin composite. 

    The reason behind this phenomenon was investigated and supported by microscopy. One of them is the natural aging of the material that operates through chain scission, that slowly makes that polymer stiffer and weaker. The other and more dominant reason is the damage taken by the fibers, that create numerous stress concentration sites at fiber ends, within the structure, ultimately damaging the fiber-matrix interface.

    Fulltekst (pdf)
    fulltext
  • 19.
    Ödlund, Martin
    Högskolan i Jönköping, Tekniska Högskolan.
    Optimization Driven Development of Stringer to Leisure Boat2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The increasing demand for products of light weight and high performance to be produced and developed in shorter periods of times has put high pressure on the product development process. Much research is done in order to find ways on how to speed up this process at the same time as delivering products of higher quality to the customer. Much of the literature focuses on how important it is to “tear down the walls” between departments at a company by integrating as much different knowledge as early in the process as possible. Thereby, much of the costly problems found late in the process can be avoided leading to shorter development times and cost savings.

    Commonly companies use simulation software to verify their final designs before the products pass forward to prototyping and test production. In some cases products need to be redesigned and big changes of the product geometry might be necessary which often is very costly in such a late stage of the process.

    Eker Design in Fredrikstad, Norway, wants to investigate the potential of using simulation driven design in an early stage of the product development process. In order to make this investigation this exam work has been carried out on a real design case by the development of a new “stringer” totally from scratch. A stringer is what gives rise to the stiffness of the boat and is a structure mounted in-between the hull and the deck. The stringer was developed to the Hydrolift SX22 leisure boat by using simulations and topology optimization software as the driving force for the design. The research questions to be answered were:

    • Is it possible to develop a stringer through a design process based on topology optimization and simulation software with equal performance as the existing stringer?
    • How does the optimized result perform in comparison to the existing stringer?
    • Can any weight reduction be achieved with a new stringer design?

    In the end of the work the existing stringer and the new stringer design was compared and evaluated. The results showed that the new stringer with a weight reduction of 30% performed very well in comparison to the existing one. This proves that the topology optimization and simulation driven design process beneficially can be used in marine architecture. It has also proven to be an efficient method to lower the material usage and increase the strength of the stringer. 

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