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首页> 外文期刊>International Journal of Solids and Structures >On the path of a crack near a graded interface under large scale yielding
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On the path of a crack near a graded interface under large scale yielding

机译：大规模屈服下渐变界面附近的裂纹路径

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The trajectory of a crack lying parallel to a thin graded layer between two plastically dissimilar materials is studied using the exclusion region (ER) theory of fracture. The ER theory is a theoretical framework for surface separation within which a broad range of fracture phenomenologies can be represented. In the present study, the direction of crack advance is determined by maximizing the resolved normal-opening force on the near-tip region, whereas separation itself is governed by the intensity of plastic deformation near the tip. A computational study was undertaken using the ER theory. The special-purpose finite element analysis platform accommodates arbitrary-and a priori unknown-crack trajectories. The model problem considered herein involves two plastically dissimilar, but elastically identical, materials joined by a thin, graded interface layer. The initial crack lies parallel to the interface layer, and crack advance occurs under conditions of extensive plastic flow. It is found that the position of the initial crack relative to the interface layer has a strong influence on the fracture behavior. In general, the crack trajectories tend to curve toward the less-ductile material. Also, the presence of the interface layer leads to fracture toughnesses that significantly exceed those of either material individually for the configurations studied. (C) 2003 Elsevier Science Ltd. All rights reserved. [References: 18]
机译：使用断裂的排除区域理论研究了与两种塑性不同的材料之间的平行于薄梯度层平行的裂纹的轨迹。 ER理论是一种用于表面分离的理论框架，在该框架内可以表示广泛的断裂现象。在本研究中，裂纹扩展的方向是通过最大程度地解决靠近尖端的法向打开力来确定的，而分离本身则受尖端附近塑性变形的强度控制。使用ER理论进行了计算研究。专用的有限元分析平台可容纳任意和先验的未知裂纹轨迹。本文考虑的模型问题涉及通过薄的渐变界面层连接的两种塑性不同但弹性相同的材料。初始裂纹平行于界面层，并且裂纹在大量塑性流动的条件下发生。发现初始裂纹相对于界面层的位置对断裂行为有很大的影响。通常，裂纹轨迹倾向于向低延展性材料弯曲。同样，界面层的存在导致断裂韧性明显超过所研究构型的任一种材料的断裂韧性。 （C）2003 Elsevier ScienceLtd。保留所有权利。 [参考：18]

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