Damage regularisation with inertia gradients

Damage regularisation with inertia gradients
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通过惯性梯度进行损伤正则化

DOI:
10.1016/j.euromechsol.2011.08.005
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发表时间:
2012
期刊:
European Journal of Mechanics - A/Solids
影响因子:
--
通讯作者:
Bennett T
Bennett T
中科院分区:
--
文献类型:
--
作者:
Bennett T

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一个梯度增强模型,制定模拟微观结构引起的波色散,并能够实现网格的目标结果时,建模应变软化材料。长度尺度参数的引入,将微惯性效应和应变平滑。该模型的制定,使所有的梯度增强项包含在动能功能,而所有的非线性项被链接到应变能功能。此外,离散化的控制方程进行的方式,使只有C 0-连续性是必需的,是对称的弹性范围内。进行色散分析,以显示正确的格式,本构模型必须符合,以正则化的应变软化材料模型将发生。这种分散分析,然后用来探讨如何两个长度尺度可能会影响应变局部化发生的区域的宽度。数值算例表明,该模型在模拟应变软化行为的网格客观的方式和波的分散损伤的启动和积累的影响的功效。
A gradient enhanced model is formulated which simulates micro-structurally induced wave dispersion and is capable of achieving mesh objective results when modelling strain-softening materials. Length scale parameters are introduced to incorporate both micro-inertial effects and strain smoothing. The model is formulated such that all the gradient enhancement terms are contained within the kinetic energy functional, whilst all non-linear terms are linked to the strain energy functional. In addition, discretisation of the governing equations is performed in a manner such that only C0-continuity is required and is symmetric in the elastic range. Dispersion analysis is performed to show the correct format that a constitutive model must conform to in order that regularisation of strain-softening material models will occur. This dispersion analysis is then used to explore how the two length scales may influence the width of the zone in which strain localisation takes place. The efficacy of the model in simulating strain-softening behaviour in a mesh objective manner and the effects of wave dispersion on damage initiation and accumulation are demonstrated in numerical examples.
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