A peridynamic material model for the analysis of dynamic crack propagation in orthotropic media
A peridynamic material model for the analysis of dynamic crack propagation in orthotropic media
复制标题
DOI：
10.1016/j.cma.2014.04.002
复制
发表时间：
2014-07-01
影响因子：
7.2
通讯作者：
Curtis, P.
中科院分区：
文献类型：
--
作者：
Ghajari, M.;Iannucci, L.;Curtis, P.
在基于键的周向断裂理论框架内，提出了一种新的各向异性材料动态断裂分析的材料模型。该模型能够预测复杂的断裂现象，如自发裂纹成核和裂纹分支，弯曲和逮捕，继承从基于键的周向理论的能力。该模型的一个重要特征是粘结性能，即刚度常数和临界拉伸，是粘结取向在主材料轴上的连续函数。这有利于具有随机取向的各向异性材料（例如多晶微结构）的断裂分析。通过模拟复合材料板的单轴拉伸和皮质骨致密拉伸试样的断裂，并与分析和实验数据进行定量比较，验证了模型的弹性和断裂行为。为了进一步证明所提出的模型的能力，动态断裂的多晶微观结构（氧化铝陶瓷）进行了模拟。本文研究了晶界断裂能和晶粒内部断裂能对多晶材料的相互作用和竞争断裂模式即沿晶断裂和穿晶断裂的影响。(C)2014爱思唯尔有限公司版权所有。
A new material model for the dynamic fracture analysis of anisotropic materials has been proposed within the framework of the bond-based peridynamic theory. This model enables predicting complex fracture phenomena such as spontaneous crack nucleation and crack branching, curving and arrest, a capability inherited from the bond-based peridynamic theory. An important feature of the model is that the bond properties, i.e. the stiffness constant and critical stretch, are continuous functions of bond orientation in the principal material axes. This facilitates fracture analysis of anisotropic materials with random orientations, such as polycrystalline microstructures. Elastic and fracture behaviour of the model has been verified through simulating uniaxial tension of a composite plate and fracture of a cortical bone compact tension specimen, and making quantitative comparisons to analytical and experimental data. To further demonstrate the capabilities of the proposed model, dynamic fracture of a polycrystalline microstructure (alumina ceramic) has been simulated. The influence of the grain boundary and grain interior fracture energies on the interacting and competing fracture modes of polycrystalline materials, i.e. intergranular and transgranular fracture, has been studied. (C) 2014 Elsevier B.V. All rights reserved.