Quantitative characterization of creep constraint induced by crack depths in compact tension specimens
Quantitative characterization of creep constraint induced by crack depths in compact tension specimens
复制标题
DOI：
10.1016/j.engfracmech.2010.11.017
复制
发表时间：
2011-03
影响因子：
5.4
通讯作者：
P. Sun;G. Wang;F. Xuan;S. Tu;Z. D. Wang
中科院分区：
文献类型：
--
作者：
P. Sun;G. Wang;F. Xuan;S. Tu;Z. D. Wang
本文用有限元法计算了不同裂纹深度CT试件的C（t）、C积分、应力重分布时间和蠕变裂纹尖端应力分布，定量地研究了裂纹深度对蠕变约束的影响。结果表明，新的约束参数R可以表征蠕变约束。非稳态蠕变时裂纹深度的约束效应比稳态蠕变时更明显。分析了裂纹深度、载荷水平和裂纹尖端距离对蠕变约束参数R的影响。
In this paper, the C(t) and C∗ integrals, stress redistribution time tredand creep crack-tip stress distributions in the CT specimens with various crack depths have been calculated by the finite element method (FEM), and the creep constraint induced by crack depths are quantitatively investigated in detail. The results show that the creep constraint could be characterized by the new constraint parameter R. The constraint effect induced by crack depths at non-steady-state creep is more pronounced than that at steady-state creep. The effects of the crack depths, load levels (C∗) and distances from the crack tips on the creep constraint parameter R are analyzed.