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首页> 外文期刊>Journal of Materials Engineering and Performance >Comparative Study of the Geometric Effects on Fracture Behaviors of Side-Grooved and Plain-Sided Compact Tension Specimens
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Comparative Study of the Geometric Effects on Fracture Behaviors of Side-Grooved and Plain-Sided Compact Tension Specimens

机译：侧面沟槽和透明紧凑型张力标本骨折行为几何效应的比较研究

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摘要

This paper investigates the fracture response and crack-tip constraint of two typical compact tension specimens. They are pre-cracked plain-sided and side-grooved specimens. In order to clarify the significant effects of geometric parameters on the crack-tip stress fields, an extensive series of detailed 3D elastic-plastic finite element analyses have been carried out. Taking the standard ratio of geometric parameters as a basis, several non-standard geometric parameters are adopted in the calculation for comparison, including specimen thickness, width, crack length. Accordingly, the variation of local J-integral and crack-tip opening displacement have been vigorously investigated over the crack front. Most importantly, the crack-tip stress fields are analyzed in detail with the emphasis on the stress triaxiality and opening mode stress. Furthermore, the crack-tip plastic strain and deformation are compared under small-scale yielding and large-scale yielding between plain-sided and side-grooved specimens, and the constraint parameter Q is employed to explain the distribution of the near-tip plastic strain. Through the vigorous research work, the variation of fracture behavior caused by geometric parameters is reasonably explained and understood.
机译：本文研究了两种典型紧凑张力标本的断裂响应和裂纹尖端约束。它们是预裂纹的透明和侧面沟槽标本。为了阐明几何参数对裂纹尖端应力场的显着影响，已经进行了广泛的3D弹塑性有限元分析。以标准比例的几何参数为基础，在计算中采用了几种非标准几何参数，以进行比较，包括样品厚度，宽度，裂缝长度。因此，在裂缝前部剧烈地研究了局部J-积分和裂纹开口位移的变化。最重要的是，详细分析裂缝尖端应力场，并强调应力三轴性和开放模式应力。此外，在小规模的屈服和大规模之间比较裂纹尖端塑料应变和变形，并且在透明和侧沟样本之间的大规模屈服，并且使用约束参数Q来解释近尖塑性应变的分布。通过剧烈的研究工作，合理地解释和理解由几何参数引起的断裂行为的变化。

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