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  • 1.
    Cannmo, Patrik
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    An interface model based on damage coupled to slip and dilatation1998Inngår i: Fracture from defects: Proceedings of the 12th Bienniel Conference on Fracture - ECF, held in Sheffield, U.K., 14-18 September 1998, West Midlands, U.K.: Engineering Materials Advisory Services , 1998, s. 957-962Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The mesomechanics behavior of a polycrystalline microstructure subjected to creep and constant strain rate loadings is investigated. The analysis is based on a Voronoi polygonization strategy for the generation of grains, that are bonded to each other via interfaces along the grain boundaries. A new constitutive model is proposed for the rate-dependent debonding along these interfaces, whereby damage is kinetically coupled to viscoplastic slip and dilatation. The paper may be viewed as generalizing the rate-independent model used in Cannmo et al. (1995).

  • 2.
    Cannmo, Patrik
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Mähler, Lennart
    Runesson, Kenneth
    Modelling of interfacial viscoplastic slip coupled to damage in a polycrystalline microstructure1997Inngår i: Computational Mechanics, ISSN 0178-7675, E-ISSN 1432-0924, Vol. 20, nr 1-2, s. 12-19Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The mesomechanics behavior of a polycrystalline microstructure subjected to creep and constant strain rate loadings is investigated. The analysis is based on a Voronoi polygonization strategy for the generation of grains, that are bonded to each other via interfaces along the grain boundaries. A new constitutive model is proposed for the rate-dependent debonding along these interfaces, whereby damage is kinetically coupled to viscoplastic slip and dilatation. The paper may be viewed as generalizing the rate-independent model used in Cannmo et al. (1995).

  • 3.
    Cannmo, Patrik
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Runesson, Kenneth
    Ristinmaa, Matti
    Modelling of plasticity and damage in a polycrystalline microstructure1995Inngår i: International journal of plasticity, ISSN 0749-6419, E-ISSN 1879-2154, Vol. 11, nr 8, s. 949-970Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The mesomechanical behavior of a polycrystalline microstructure subjected to monotonic and cyclic loadings is investigated. The analysis is based on a Voronoi polygonization strategy for generation of grains embedded in a contiguous matrix. The main emphasis is to investigate the interaction between the microconstituents and the failure processes along grain boundaries. A rational interface theory based on damage development coupled to inelastic slip and dilatation is developed. The theory uses the interface width as a constitutive parameter, which regularizes the theory of LEMAITRE [1992], that is restricted to perfect bond between grain and matrix. In a series of FE-analyses parameter variations were performed. The unit cell size (as compared to the average grain diameter), the grain-matrix area ratio, the interface width and constitutive parameters. It appears that the composite behavior can be designed as brittle or ductile solely depending on the strength and rate of damage development in the interfaces. A localization band was detected, and its orientation is in the range that is predicted within continuum theory

  • 4.
    Cannmo, Patrik
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Seifeddine, Salem
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    Svensson, Linnea
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    Svensson, Ingvar L
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    Stress-Strain Modelling Influenced by Porosities in Cast Aluminium Alloys2006Konferansepaper (Fagfellevurdert)
  • 5.
    Cannmo, Patrik
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Snygg, Henrik
    FE-modeling of dynamic experimental testing with large elastic-plastic deformations2001Inngår i: Proceedings of IMAC-XIX: a conference on structural dynamics : February 5-8, 2001, Hyatt Orlando, Kissimmee, Florida, Bethel, Conn.: Society for Experimental Mechanics , 2001, s. 531-537Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Several types of dynamic tests are carried out at SP Swedish National Testing and Research Institute. The tests considered in this paper, which are all simulated with FE-calculations, are as follows: a drop test of cask filled with water, a tennis racket/ball test, a test of a full face protector for hockey players and an impact test of a simplified bumper. To obtain a high-quality verification of the FE-results high-speed video recording of the test sequence is done in all four cases. Parameter studies are done regarding velocity and drop height. The FE-models are built up in the commercial software ABAQUS and I-deas, and are all solved numerically with ABAQUS/Explicit. The material models used in the FE-calculations include linear elastic, elastic-plastic with non-linear hardening, hyperelastic and linear hydrodynamic behavior. Different types of tests are carried out on material specimens in order to determine the material parameters used in the FE-models.

  • 6. Christensen, XP.W
    et al.
    Klarbring, A
    Pang, J.S.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Formulation and comparison of algorithms for frictional contact problems1998Inngår i: International Journal for Numerical Methods in Engineering, ISSN 0029-5981, E-ISSN 1097-0207, Vol. 42, nr 1, s. 145-173Artikkel i tidsskrift (Fagfellevurdert)
  • 7. Gustafsson, E
    et al.
    Hofwing, Magnus
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Simulation and Measurement of Residual Stresses in a Stress Lattice2007Inngår i: Proceedings of the the 2nd International Conference of Simulation and Modelling of Metallurgical Processes in Steelmaking, September 12-14, Austria, 2007, Leoben: ASMET , 2007, s. 285-290Konferansepaper (Fagfellevurdert)
  • 8. Gustafsson, E
    et al.
    Hofwing, Magnus
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Simulering och mätning av restspänningar i spänningsharpor2007Inngår i: Luleå tekniska universitet, Svenska Mekanikdagar, 13-15 juni, 2007, 2007Konferansepaper (Annet vitenskapelig)
  • 9. Gustafsson, E
    et al.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Shape optimization of castings by using successive response surface methodology2008Inngår i: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 35, nr 1, s. 11-28Artikkel i tidsskrift (Fagfellevurdert)
  • 10. Gustafsson, E
    et al.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Structural optimization of castings by using ABAQUS and Matlab2005Inngår i: Proceedings of the Seminar on Competent Design by Castings (GJUTDESIGN -2005), June 13-14, Espoo, FINLAND,, 2005Konferansepaper (Fagfellevurdert)
  • 11. Gustafsson, E.
    et al.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Structural optimization of castings by using Abaqus and Matlab2005Inngår i: Proceedings of the Abaqus World Users' Conference, May 18-20, Stockholm, Sweden, 2005., 2005Konferansepaper (Fagfellevurdert)
  • 12.
    Gustafsson, E
    et al.
    Högskolan i Jönköping.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Strukturoptimering av gjutgods med hänsyn tagen till gjutspänningar2007Inngår i: Luleå tekniska universitet, Svenska Mekanikdagar, 13-15 juni, 2007, 2007Konferansepaper (Annet vitenskapelig)
  • 13. Gustafsson, E
    et al.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Successive Response Surface Methodology by using Neural Networks2007Inngår i: Proceedings of the 7th World Congress on Structural and Multidisciplinary Optimization, May 21-25, Seoul, Korea, 2007Konferansepaper (Fagfellevurdert)
  • 14.
    Gustafsson, Erik
    et al.
    Väderstad-Verken AB.
    Hofwing, Magnus
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Residual stresses in a stress lattice - experiments and finite element simulations2009Inngår i: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 209, nr 9, s. 4320-4328Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this work residual stresses in a stress lattice are studied. The residual stresses are both measured and simulated. The stress lattice is casted of low alloyed grey cast iron. In fact, nine similar lattices are casted and measured. The geometry of the lattice consists of three sections in parallel. The diameter of the two outer sections are thinner than the section in the middle. When the stress lattice cools down, this difference in geometry yields that the outer sections start to solidify and contract before the section in the middle. Finally, an equilibrium state, with tensile stresses in the middle and compressive stresses in the outer sections, is reached. The thermo-mechanical simulation of the experiments is performed by using Abaqus. The thermo-mechanical solidification is assumed to be uncoupled. First a thermal analysis, where the lattice is cooled down to room temperature, is performed. Latent heat is included in the analysis by letting the fraction of solid be a linear function of the temperature in the mushy zone. After the thermal analysis a quasi-static mechanical analysis is performed where the temperature history is considered to be the external force. A rate independent J2-plasticity model with isotropic hardening is considered, where the material data depend on the temperature. Tensile tests are performed at room temperature, 200°C, 400°C, 600°C and 800°C in order to evaluate the Young´s modulus, the yield strength and the hardening accurate. In addition, the thermal expansion coefficient is evaluated for temperatures between room temperature and 1000°C. The state of residual stresses is measured by cutting the mid section or the outer section. The corresponding elastic spring-back reveals the state of residual stresses. The measured stresses are compared to the numerical simulations. The simulations show good agreement with the results from the experiments.

  • 15.
    Hofwing, Magnus
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Design of Experiments - A- D- I- S-optimality2010Inngår i: proceedings of the 2nd International Conference on Engineering Optimization, 2010Konferansepaper (Fagfellevurdert)
  • 16.
    Hofwing, Magnus
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Robustness and FEA of residual stresses in castings2009Licentiatavhandling, med artikler (Annet vitenskapelig)
  • 17.
    Hofwing, Magnus
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    D-optimality of non-regular design spaces by using a Bayesian modification and a hybrid method2010Inngår i: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 42, nr 1, s. 73-88Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this work a hybrid method of a genetic algorithm  and sequential linear programming is suggested to obtain a D-optimal design of experiments. Regular as well as non-regular design spaces are considered. A D-optimal design of experiments maximizes the determinant of the information matrix, which appears in the normal equation. It is known that D-optimal design of experiments sometimes include duplicate design points. This is, of course, not preferable since duplicates do not add any new information to the response surface approximation and the computational effort is therefore wasted. In this work a Bayesian modification, where higher order terms are added to the response surface approximation, is used in case of duplicates in the design of experiments. In such manner, the draw-back with duplicates might be eliminated. The D-optimal problem, which is obtained by using the Bayesian modification, is then solved by a hybrid method. A hybrid method of a genetic algorithm that generates a starting point for sequential linear programming is developed. The genetic algorithm performs genetic operators such as cross-over and mutation on a binary version of the design of experiments, while the real valued version is used to evaluate the fitness. Next, by taking the gradient of the objective, a LP-problem is formulated which is solved by an interior point method that is available in Matlab. This is repeated in a sequence until convergence is reached. The hybrid method is tested for four numerical examples. Results from the numerical examples show a very robust convergence to a global optimum. Furthermore, the results show that the problem with duplicates is eliminated by using the Bayesian modification.

  • 18.
    Hofwing, Magnus
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    D-optimality of non-regular design spaces by using a Genetic Algorithm2009Inngår i: proceedings of the 8th World Congress on Structural and Multidisciplinary Optimization, June 1-5, Lisbon, Portugal, 2009, 2009Konferansepaper (Fagfellevurdert)
  • 19.
    Hofwing, Magnus
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Robustness of residual stresses in castings and an improved process window2009Inngår i: proceedings of the 35th Design Automation Conference, August 30-September 2, San Diego, USA 2009., 2009Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this work the robustness of residual stresses in finite element simulations with respect to deviations in mechanical parameters in castings is evaluated. Young's modulus, the thermal expansion coefficient and the hardening are the studied parameters. A 2D finite element model of a stress lattice is used. The robustness is evaluated by comparing purely finite element based Monte Carlo simulations and Monte Carlo simulations based on linear and quadratic response surfaces. Young's modulus, the thermal expansion coefficient and the hardening are assumed to be normal distributed with a standard deviation that is 10% of their nominal value at different temperatures. In this work an improved process window is also suggested to show the robustness graphically. By using this window it is concluded that least robustness is obtained for high hardening values in combination to deviations in Young's modulus and the thermal expansion coefficient. It is also concluded that quadratic response surface based Monte Carlo simulations substitute finite element based Monte Carlo simulations satisfactory. Furthermore, the standard deviation of the responses are evaluated analytically by using the Gauss formula, and are compared to results from Monte Carlo simulations. The analytical solutions are accurate as long as the Gauss formula is not utilized close to a stationary point.

  • 20.
    Hofwing, Magnus
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Simulation of residual stresses in stamping dies2008Inngår i: Proceedings of the IDDRG 2008 Conference: Best in class stamping, 16-18 June 2008, Olofström, Sweden / [ed] Nader Asnafi, Olofström: Industriellt utvecklingscentrum i Olofström AB , 2008, s. 765-776Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In the past stamping dies have in principle been designed by rules of thumb and intuition. As the sheet metals in the vehicle industry have got increased mechanical properties in recent years the demands on the stamping dies have increased. For instance increase in stiffness is desirable in order to better control spring-back. The most simple way to satisfy this new demand would be to make the stamping dies even more heavy in order to be able to handle the new sheet metals. Since there are restrictions of the weight of the stamping dies in the stamping machines and since the overhead cranes usually have reached the limit of what they can handle, this is not a desirable solution. Another approach, in order to increase the stiffness without increasing the weight is to use topology optimization. Recently in a master thesis at Volvo Car Corporation a conceptual design of a stamping die has been done by topology optimization. In that work no consideration is taken to the fact that the stamping die is casted. Casting implies that residual stresses possibly are produced during the solidification and cooling process. The residual stresses might affect the fatigue life and the risk of failure of the stamping die.

    In this work the residual stress state after casting is analyzed for the original stamping die as well as the optimized stamping die from the master thesis discussed above. The analyses are performed using an uncoupled approach, where one thermal analysis is followed by a quasi-static elasto-plastic analysis. The thermal analysis simulates the solidification and cooling during the casting process, while the quasi-static elasto-plastic analysis uses the temperature history, obtained from the thermal analysis, in order to build up residual stresses. The thermal analysis includes the release of latent heat. Furthermore, the material properties included in the heat equation (density, conductivity, specific heat) are given as temperature dependent properties for the mould as well as the casting. In the quasi-static elasto-plastic analysis the plasticity is described by the von Mises yield surface in combination with isotropic hardening and the mechanical properties (thermal expansion coefficient, Young's modulus, yield stress, hardening parameter, Poisson's ratio) are given as temperature dependent properties. The simulations show high levels of residual stresses.

     

  • 21. Ireman, P
    et al.
    Klarbring, A
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    A model of damage coupled to wear2003Inngår i: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 40, nr 12, s. 2957-2974Artikkel i tidsskrift (Fagfellevurdert)
  • 22. Ireman, P
    et al.
    Klarbring, A
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Algorithms for thermoelastic wear problems2002Inngår i: Contact mechanics: proceedings of the 3rd Contact Mechanics International Symposiuum, Praia da Consolação, Peniche, Portugal, 17-21 June 2001, Dordrecht: Kluwer Academic , 2002, s. 363-370Konferansepaper (Fagfellevurdert)
  • 23. Ireman, P
    et al.
    Klarbring, A
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Algoritmer för termoelastiska nötningsproblem2001Inngår i: Svenska Mekanikdagar, Linköpings universitet, 11-13 juni,2001, 2001Konferansepaper (Annet vitenskapelig)
  • 24. Ireman, P
    et al.
    Klarbring, A
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Finite element algorithms for thermoelastic wear problems2002Inngår i: European journal of mechanics. A, Solids, ISSN 0997-7538, E-ISSN 1873-7285, Vol. 21, nr 3, s. 423-440Artikkel i tidsskrift (Fagfellevurdert)
  • 25. Ireman, P
    et al.
    Klarbring, A
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Gradient Theory of Damage Coupled to Frictional Contact and Wear, and Its Numerical Treatment2009Inngår i: CMES - Computer Modeling in Engineering & Sciences, ISSN 1526-1492, E-ISSN 1526-1506, Vol. 52, nr 2, s. 125-158Artikkel i tidsskrift (Fagfellevurdert)
  • 26. Klarbring, A
    et al.
    Lundvall, O
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    A flexible multi-body approach for frictional contact in spur gears2004Inngår i: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 278, nr 3, s. 479-499Artikkel i tidsskrift (Fagfellevurdert)
  • 27.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    A method for structural dynamic contact problems with friction and wear2003Inngår i: International Journal for Numerical Methods in Engineering, ISSN 0029-5981, E-ISSN 1097-0207, Vol. 58, nr 15, s. 2371-2385Artikkel i tidsskrift (Fagfellevurdert)
  • 28.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    A Newton algorithm for fretting problems1996Inngår i: Euromech Colloquium 351, Systems with Coulomb friction, Vadstena, Sweden, August 5-7, 1996, 1996Konferansepaper (Annet vitenskapelig)
  • 29.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    A Newton algorithm for wear problems1997Inngår i: 3rd EUROMECH Solid Mechanics Conference, Stockholm, Sweden, August 18-22, 1997, 1997Konferansepaper (Annet vitenskapelig)
  • 30.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    A Newton method for three-dimensional fretting problems1999Inngår i: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 36, nr 14, s. 2075-2090Artikkel i tidsskrift (Fagfellevurdert)
  • 31.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    An augmented Lagrangian method for fretting problems1996Inngår i: Euromech Colloquium 346, March 20-22, Oxford, 1996., 1996Konferansepaper (Annet vitenskapelig)
  • 32.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    An augmented Lagrangian method for fretting problems1997Inngår i: European journal of mechanics. A, Solids, ISSN 0997-7538, E-ISSN 1873-7285, Vol. 16, nr 4, s. 573-593Artikkel i tidsskrift (Fagfellevurdert)
  • 33.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    An Efficient Tradeoff Approach for Topology Optimization with Manufacturing Constraints2010Inngår i: 36th Design Automation Conference, ASME proceedings, 2010Konferansepaper (Fagfellevurdert)
  • 34.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    An Implicit Method for Frictional Contact, Impact and Rolling2005Inngår i: European journal of mechanics. A, Solids, ISSN 0997-7538, E-ISSN 1873-7285, Vol. 24, nr 6, s. 1016-1029Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper an implicit method for frictional contact, impact and rolling is suggested. A nonclassical formulation of a two-dimensional hyperelastic body unilaterally constrained to rigid supports is proposed by following the ideas of Moreau and Jean. A total Lagrangian formulation of the system is given. The elastic properties are defined by coupling the second Piola–Kirchhoff stress to the Green–Lagrange strain via the Kirchhoff–St. Venant law. The equation of motion is written in the spirit of Moreau by using the mean value impulses introduced by Jean. The mean value impulses appear explicitly in the equation of motion. In such manner the treatment of nonconstant kinematic transformation matrices becomes straightforward. The rigid supports are described by smooth functions. By utilizing these functions and the mean value impulses, new contact/impact laws of Signorini and Coulomb type are formulated. The governing equations are solved by a nonsmooth Newton method. This is performed by following the augmented Lagrangian approach and deriving the consistent stiffness matrix as well as the contact stiffness matrices. Three two-dimensional examples are solved by the method: a contact problem, an impact problem and a rolling contact problem.

  • 35.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Augmented Lagrangian methods for wear problems1995Inngår i: NSCM VIII: eighth Nordic seminar on computational mechanics : Göteborg November 17-18, 1995 : short papers, Göteborg: Department of Structural Mechanics, Chalmers University of Technology , 1995Konferansepaper (Annet vitenskapelig)
  • 36.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Conceptual design of a hub by using topology optimization and residual stress simulations2007Inngår i: handouts in the proceedings of the 1st European HTC, 23-24 October, Berlin, 2007, 2007Konferansepaper (Annet (populærvitenskap, debatt, mm))
  • 37.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Contact, impact and rolling of a nonlinear elastic body on rigid foundations2005Inngår i: Proceedings of Multibody Dynamics, International Conference on Advances in Computational Multibody Dynamics: June 21-24, Madrid, Spain, 2005, 2005Konferansepaper (Fagfellevurdert)
  • 38.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Contact Modeling in Topology Optimization2010Inngår i: the IV European Conference on Computational Mechanics (Abstracs), 2010Konferansepaper (Fagfellevurdert)
  • 39.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    En implicit metod för kontakt och stötproblem med stora rotationer2007Inngår i: Luleå tekniska universitet, Svenska Mekanikdagar, 13-15 juni, 2007, 2007Konferansepaper (Annet vitenskapelig)
  • 40.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Finite element treatment of thermoelastic wear problems1998Inngår i: Proceedings of the IUTAM-Symposium on Unilateral Multibody Dynamics, 1998Konferansepaper (Fagfellevurdert)
  • 41.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Finite element treatment of tribological problems1998Inngår i: Proceedings of the International Symposium on Impact and Friction of Solids, Structures and Machines, June 27-30, Ottawa, Canada, 1998, 1998Konferansepaper (Fagfellevurdert)
  • 42.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Finite element treatment of two-dimensional thermoelastic wear problems1999Inngår i: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 177, nr 3-4, s. 441-455Artikkel i tidsskrift (Fagfellevurdert)
  • 43.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Frictional Contact/Impact between a Hyperelastic Body and Moving Rigid Obstacles2006Inngår i: Proceedings of the 3rd European Conference on Computational Mechanics: June 5-9, Lisbon, Portugal, 2006., 2006Konferansepaper (Fagfellevurdert)
  • 44.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Simulation of Rotary Draw Bending using Abaqus and a Neural Network2005Inngår i: Proceedings of Nafems Nordic Conference on Component and System Analysis using Numerical Simulation Techniques - FEA, CFD, MBS: November 24-25, Gothenburg, 2005., 2005Konferansepaper (Fagfellevurdert)
  • 45.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    The Influence of Sliding Friction on Optimal Topologies2009Inngår i: Proceedings of the 5th Contact Mechanics International Symposium, April 28-30, Chania, Greece, 2009, 2009Konferansepaper (Fagfellevurdert)
  • 46.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering. Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    Topologioptimering av olinjära strukturer2009Konferansepaper (Annet vitenskapelig)
  • 47.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering. Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    Topology optimization of structures with manufacturing and unilateral contact constraints by minimizing an adjustable compliance–volume product2010Inngår i: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 42, nr 3, s. 341-350Artikkel i tidsskrift (Fagfellevurdert)
  • 48.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Topology optimization of linear elastic structures with contact boundaries2008Inngår i: 5th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2008), 2008Konferansepaper (Annet vitenskapelig)
  • 49.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Topology Optimization of Non-linear Elastic Structures by using SLP2009Inngår i: 35th Design Automation Conference, ASME, 2009Konferansepaper (Fagfellevurdert)
  • 50.
    Strömberg, Niclas
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Simulering och optimering.
    Topology Optimization of Two Linear Elastic Bodies in Unilateral Contact2010Inngår i: proceedings of the 2nd International Conference on Engineering Optimization, 2010Konferansepaper (Fagfellevurdert)
12 1 - 50 of 60
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