Sökning: "Finite strains"
Visar resultat 11 - 15 av 90 avhandlingar innehållade orden Finite strains.
11. Modeling of evolving anisotropy at finite elasto-plastic strain
Sammanfattning : Simulation tools are used to a wide extent in the product development process today, both to obtain better products and to reduce the development time required. Anisotropic materials are utilized in many engineering applications. LÄS MER
12. Evolution of Anisotropy in Continua Exposed to Large Strains
Sammanfattning : This thesis deals with the modeling of anisotropic materials at finite deformations. The major emphasis is the development of constitutive models able to account for the evolving directionally dependent properties of these materials. In addition, the numerical implementation of the models developed is addressed. LÄS MER
13. Aspects on finite element simulation of sheet metal forming processes
Sammanfattning : This thesis has focused on four different aspects of finite element simulation of sheet metal forming processes. Four substantial research areas are the development of a methodology for predicting the limiting strains in connection with the Forming Limit Diagram, the applicable mode of procedure for finite element simulation of the hydromechanical deep drawing process, the adaptive mesh refinement strategy based on gradients of the effective plastic stresses and strains; and the reliability and sensitivity assessments within sheet metal forming processes. LÄS MER
14. Strain rate dependent material model for polymer composites
Sammanfattning : We propose a micromechanical model that is able to predict the nonlinear behaviour and failure of unidirectional fibre reinforced polymer composites subjected to dynamic loading conditions. This novel material model is heterogeneous on the micro level and homogeneous on the ply level. LÄS MER
15. An adaptive finite element method for the compressible Euler equations
Sammanfattning : This work develops a stabilized finite element method for the compressible Euler equations and proves an a posteriori error estimate for the approximated solution. The equations are approximated by the cG(1)cG(1) finite element method with continuous piecewise linear functions in space and time. LÄS MER