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arXiv 2104.08607math.AP
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随机非均匀颗粒链脆性断裂变分模型的推导

Derivation of a variational model for brittle fracture from a random heterogeneous particle chain

Laura Lauerbach, Anja Schlömerkemper

摘要:

一个随机粒子链的相互作用能的数学连续极限示出产生新的洞察微观不均匀性的影响,宏观断裂法在脆性材料。我们推导出一个公式,它产生的弹性行为或裂纹是积极的首选。该公式明确地显示了对边界条件和链的微观结构的依赖性。数学分析是基于变分收敛$Γ$ -收敛的凹凸潜力连同遍历定理,这是常见的工具,在随机均匀化。

英文摘要:

A mathematical continuum limit of the interaction energy of a random particle chain is shown to yield new insight into the effect of microscopic heterogeneities on macroscopic fracture laws in brittle materials. We derive a formula which yields that either elastic behaviour or a crack is energetically preferred. The formula explicitly shows the dependence on the boundary condition and the microstructure of the chain. The mathematical analysis is based on a variational convergence $Γ$-convergence of convex-concave potentials together with ergodic theorems which are common tools in stochastic homogenization.

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