Quantifying the creep crack-tip constraint effects using a load-independent constraint parameter Q
Quantifying the creep crack-tip constraint effects using a load-independent constraint parameter Q
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使用与载荷无关的约束参数 Q 量化蠕变裂纹尖端约束效应
DOI：
10.1016/j.ijmecsci.2016.11.002
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发表时间：
2016
影响因子：
7.3
通讯作者：
Zhao L
中科院分区：
文献类型：
--
作者：
Xu Lianyong;Zhang Xingfu;Zhao Lei;Han Yongdian;Jing Hongyang;Xu Lianyong;Zhang Xingfu;Zhao Lei;Han Yongdian;Jing Hongyang;Zhao L
在这项工作中，引入了与载荷无关的蠕变约束参数Q*，并通过六个不同裂纹样本的3D有限元分析证实了其与载荷无关。选择裂纹尖端前 0.2 毫米的固定距离来定义 Q*。此外，参数Q*用于量化裂纹深度、试件宽度和加载配置引起的面内约束以及试件厚度引起的约束效应。结果表明，Q*值随着裂纹深度(a/W≤0.5)和试件厚度的增加而增大，随着试件宽厚比W/B的增加而减小。此外，最高的约束水平出现在 CT 样本中，而最低的约束水平出现在 CCT 样本中。
In this work, a load-independent creep constraint parameterQ*was introduced, and its load-independence was confirmed by 3D finite element analyses of six different cracked specimens. A fixed distancer=0.2 mm ahead of crack tips was chosen to define theQ*. In addition, the parameterQ*was used to quantify the in-plane constraint induced by crack depths, specimen widths and loading configurations and the constraint effects induced by specimen thicknesses. The results revealed that the values ofQ*increased with increasing the crack depths (a/W≤0.5) and specimen thicknesses and decreased with increasing the width-thickness ratioW/Bof specimens. Furthermore, the highest constraint level occurred in the CT specimen while the lowest occurred in the CCT specimen.