نتایج جستجو برای: elastoplasticity

تعداد نتایج: 253  

Journal: :JSME international journal. Ser. 1, Solid mechanics, strength of materials 1990

Journal: :Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 2012

2013
THOMAS BETZ CHRISTIAN MEYER

The paper is concerned with the optimal control of static elastoplasticity with linear kinematic hardening. This leads to an optimal control problem governed by an elliptic variational inequality (VI) of first kind in mixed form. Based on Lp-regularity results for the state equation, it is shown that the control-to-state operator is Bouligand differentiable. This enables to establish second-ord...

Journal: :J. Nonlinear Science 2009
Andreas Mainik Alexander Mielke

We provide a global existence result for the time-continuous elastoplasticity problem using the energetic formulation. For this we show that the geometric nonlinearities via the multiplicative decomposition of the strain can be controlled via polyconvexity and a priori stress bounds in terms of the energy density. While temporal oscillations are controlled via the energy dissipation the spatial...

2015
VITO CRISMALE

We show the existence of globally stable quasistatic evolutions for a rateindependent material model with elastoplasticity and incomplete damage, in small strain assumptions. The main feature of our model is that the scalar internal variable which describes the damage affects both the elastic tensor and the plastic yield surface. It is also possible to require that the history of plastic strain...

Journal: :SIAM J. Math. Analysis 2015
Elisa Davoli Gilles A. Francfort

We propose a new evolution model for large strain elastoplasticity. In a quasi-static setting the suggested model can be formulated as a variational evolution. We establish existence of a closely related evolution in a regularized context. We then discuss how the proposed model performs in both a rigid-plastic, and a one-dimensional settings and compare the results with those that could be achi...

2004
Vlado A Lubarda

Some fundamental issues in the formulation of constitutive theories of material response based on the multiplicative decomposition of the deformation gradient are reviewed, with focus on finite deformation thermoelasticity, elastoplasticity, and biomechanics. The constitutive theory of isotropic thermoelasticity is first considered. The stress response and the entropy expression are derived in ...

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