首页> 外文会议>IUYAM Symposium on Theoretical and Numerical Methods in Continuum Mechanics of Porous Materials, Sep 5-10, 1999, Stuttgart, Germany >Perspective of Computational Micro-Macro-Transition for the Postcritical Analysis of Localized Failure
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Perspective of Computational Micro-Macro-Transition for the Postcritical Analysis of Localized Failure

机译:局部失效后临界分析的计算微观宏转换的视角

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The simulation of localized failure in elastic-plastic solids, e.g. in the form of shear bands, yields the typical mesh-dependent postcritical results within standard finite element formulations. We here propose a new relaxation technique based on a micromechanically motivated approach which overcomes this problem. The key idea is the introduction of a micro-structure at a typical Gauss-point of the finite element mesh which bifurcates in the form of an assumed fluctuation field when macroscopic localization occurs. The method can be understood as an approximated quasi-convexification of a non-convex incremental stress potential function.
机译:弹塑性固体中局部破坏的模拟,例如以剪切带的形式,在标准有限元公式中产生典型的网格相关后临界结果。我们在此提出了一种新的放松技术,该技术基于微机械驱动的方法,可以克服此问题。关键思想是在有限元网格的典型高斯点处引入微结构,当发生宏观定位时,微结构以假定的波动场的形式分叉。该方法可以理解为非凸增量应力势函数的近似拟凸。

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