Stochastic Multiscale Coupling of Inelastic Processes in Solid Mechanics

Stochastic Multiscale Coupling of Inelastic Processes in Solid Mechanics
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固体力学中非弹性过程的随机多尺度耦合

DOI:
10.1007/978-3-319-06331-7_9
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发表时间:
2014
期刊:
ArXiv
影响因子:
--
通讯作者:
A. Ibrahimbegovic
A. Ibrahimbegovic
中科院分区:
--
文献类型:
--
作者:
H. Matthies;A. Ibrahimbegovic

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在这里,我们考虑非均质材料的非弹性非线性响应,可能经历局部破坏。我们认为材料在许多尺度上是不均匀的,但为了简单起见,我们只考虑一个尺度的转变。微观尺度被认为是不完全已知的,因此是不确定的,因此是以概率为模型的。讨论了两种可供选择的方法:一种是局域化区域,需要相当详细的微观描述来捕捉相关效应;另一种是在区域中,它足够精确地定义宏观尺度上的“广义标准材料”的唯象模型,这些模型必须通过微观计算来确定。除了机械量在不同尺度之间的适当转移外,模型的随机部分也必须实现同样的转移。详细讨论了所提出的方法的几个主要组成部分,包括结构化网格的微结构近似、随机场表示和贝叶斯更新。
Here we consider the inelastic nonlinear response of heterogeneous materials, possibly undergoing localised failure. We regard the material to be heterogeneous on many scales, but for simplicity we only look at one scale transition. The micro-scale is regarded as incompletely known and hence uncertain, therefore modelled probabilistically. Two alternative approaches are discussed: one for localised regions where a rather detailed micro-description is necessary to capture relevant effects, and the other in domains where it is accurate enough to define phenomenological models of ‘generalised standard materials’ on the macro-scale, which have to be identified via micro-scale computations. Apart from a proper transfer of mechanical quantities across scales, the same has to be achieved for the stochastic part of the model. Several main ingredients of the proposed approaches are discussed in detail, including micro-structure approximation with a structured mesh, random field representation, and Bayesian updating.
DOI: 10.1016/j.jcp.2012.04.044
发表时间: 2012-07
期刊: J. Comput. Phys.
影响因子: --
作者:
B. Rosic;A. Litvinenko;O. Pajonk;H. Matthies
通讯作者: B. Rosic;A. Litvinenko;O. Pajonk;H. Matthies
DOI: 10.1016/j.engstruct.2012.12.029
发表时间: 2012-01
期刊: ArXiv
影响因子: --
作者:
B. Rosic;A. Kucerová;J. Sýkora;O. Pajonk;A. Litvinenko;H. Matthies
通讯作者: B. Rosic;A. Kucerová;J. Sýkora;O. Pajonk;A. Litvinenko;H. Matthies