Crack sensitivity of nacre-like laminate composite materials: Monte Carlo simulation based on stability theory
Crack sensitivity of nacre-like laminate composite materials: Monte Carlo simulation based on stability theory
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DOI：
10.1016/j.ijsolstr.2020.06.043
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发表时间：
2020-07
影响因子：
3.6
通讯作者：
Yi Yan;A. Nakatani
中科院分区：
文献类型：
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作者：
Yi Yan;A. Nakatani
研究珍珠层的开裂过程对理解其增韧机理具有重要意义。采用基于确定性概念的传统断裂力学方法来再现珍珠层中复杂的裂纹现象存在一定的挑战。从稳定性分析的角度出发，提出了一种基于能量的蒙特卡罗（MC）方法来搜索运动允许变形场中的能量最小构型。MC算法实现的三种变形机制和随机性与系统的稳定性演化很好地协调。研究了宽高比、软相拉伸和剪切变形对裂纹模式转变的影响。调整这些参数后，发现裂纹分支、非局部裂纹和独立裂纹扩展三种特征裂纹模式。其中两种裂纹模式表现出明显的裂纹不敏感。从材料稳定性的角度讨论了这些裂纹模式的内部机理和裂纹敏感性。本研究为研究类珠状层合复合材料的裂纹扩展提供了新的视角和数值方法，并对这些特征裂纹模式的裂纹敏感性给出了一些新的解释。
Studying the cracking process of nacre is critical for understanding its toughening mechanisms. There are certain challenges in using the conventional fracture mechanics based on a deterministic concept for reproducing the complicated cracking phenomena in nacre. From the perspective of stability analysis, we present an energy-based Monte Carlo (MC) method to search the energy minimum configuration in the kinematically admissible deformation field. Three types of deformation mechanisms and the randomness implemented in MC algorithm coordinate well with system’s stability evolutions. We investigated the effect of aspect ratio, tensile and shear deformation of soft phase on the cracking mode transition. Three characteristic cracking modes of crack branching, unlocalized cracking, and independent crack propagation, are found with the adjustment of these parameters. Two of these cracking modes exhibit apparent crack insensitivity. The inner mechanisms of these cracking modes and the crack sensitivity are discussed from the view of material stability. This study offers a new insight and numerical method into the cracking propagation of nacre-like laminate composite materials, and gives some new explanations about the crack sensitivity of these characteristic cracking modes.