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首页> 外文期刊>International Journal of Mechanical Sciences >Quantifying the creep crack-tip constraint effects using a load-independent constraint parameter Q
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Quantifying the creep crack-tip constraint effects using a load-independent constraint parameter Q

机译:使用独立于载荷的约束参数Q量化蠕变裂纹尖端约束效应

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摘要

In this work, a load-independent creep constraint parameter Q* was introduced, and its load-independence was confirmed by 3D finite element analyses of six different cracked specimens. A fixed distance r=0.2 mm ahead of crack tips was chosen to define the Q*. In addition, the parameter Q* 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 of Q* increased with increasing the crack depths (a/W <= 0.5) and specimen thicknesses and decreased with increasing the width-thickness ratio W/B of specimens. Furthermore, the highest constraint level occurred in the CT specimen while the lowest occurred in the CCT specimen.
机译:在这项工作中,引入了独立于载荷的蠕变约束参数Q *,并通过对六个不同裂纹样本的3D有限元分析来确定其载荷独立性。选择裂纹尖端之前的固定距离r = 0.2 mm来定义Q *。另外,参数Q *用于量化由裂纹深度,试样宽度和载荷构型引起的面内约束以及由试样厚度引起的约束效应。结果表明,Q *值随裂纹深度(a / W <= 0.5)和样品厚度的增加而增加,而随样品的宽厚比W / B的增加而减小。此外,最高约束水平出现在CT样品中,而最低约束水平出现在CCT样品中。

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