Fracture Toughness Prediction under Compressive Residual Stress by Using a Stress-Distribution T-Scaling Method-猫眼课题宝

DOI：

10.3390/met8010006

发表时间：

2017-12

期刊：

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通讯作者：

中科院分区：

其他

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作者：

T. Meshii;K. Ishihara

本研究考虑了由于压缩残余应力 (CRS) 而导致材料在延性到脆性转变温度区域的断裂韧性 Jc 的提高。使用 T 缩放方法对具有机械 CRS 的样本进行了直接的断裂预测，该方法最初是为了缩放不同温度之间的断裂应力分布而提出的。该方法针对 780 MPa 级高强度钢和 0.45% 碳钢进行了验证。结果表明，没有和有 CRS 的断裂载荷下的缩放应力分布是相同的，并且 Jc 的改进是由于 J 和裂纹尖端应力分布之间的一一对应关系的丧失造成的。该方法的优点是仅使用应力-应变关系并通过弹塑性有限元分析来预测具有 CRS 的试样的断裂载荷，即无需对没有 CRS 的试样进行断裂韧性测试。

The improvement in the fracture toughness Jc of a material in the ductile-to-brittle transition temperature region due to compressive residual stress (CRS) was considered in this study. A straightforward fracture prediction was performed for a specimen with mechanical CRS by using the T-scaling method, which was originally proposed to scale the fracture stress distributions between different temperatures. The method was validated for a 780-MPa-class high-strength steel and 0.45% carbon steel. The results showed that the scaled stress distributions at fracture loads without and with CRS are the same, and that Jc improvement was caused by the loss in the one-to-one correspondence between J and the crack-tip stress distribution. The proposed method is advantageous in possibly predicting fracture loads for specimens with CRS by using only the stress–strain relationship, and by performing elastic-plastic finite element analysis, i.e., without performing fracture toughness testing on specimens without CRS.

Fracture Toughness Prediction under Compressive Residual Stress by Using a Stress-Distribution T-Scaling Method

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