对含裂纹材料与结构断裂力学评估中的最大环向应力准则（MTS）、最小应变能密度因子准则（SED）和平均应变能密度准则（ASED）以及在此基础上考虑应力场常数项影响修正的断裂准则进行介绍；基于考虑裂尖应力场奇异项和常数项的修正MTS准则、修正SED准则和修正ASED准则，对比分析了裂尖应力场常数项对I型裂纹的起裂扩展行为，探究了裂纹尖端应力场常数项以及材料泊松比对I型裂纹偏折、断裂极限的影响规律，掌握了应力场常数项对I型裂纹偏折、起裂扩展影响阀值。研究结果表明，裂纹尖端应力场常数项T应力对I型裂纹起裂扩展偏折角及断裂判据的影响不可忽略，研究结果可为含裂纹材料与结构断裂力学评估提供一定参考。
The maximum tangential stress (MTS), minimum strain energy density factor (SED), averaged strain energy density (ASED) criterion and the modified criteria based on MTS, SED and ASED considering non-singular stress term T-stress are introduced. The effect of non-singular stress term T-stress and the Poisson’s ratio on the mode I crack fracture initiation angel and the critical intensity factor based on different criterion were analyzed and compared. The influence trend and threshold of the T-stress effect on mode I crack fracture deflection and crack onset propagation condition were then given. The analysis results show that the constant T-stress has a significant effect on mode I fracture behavior for linear elastic materials.
2024,46(13): 1-8 收稿日期：2023-05-29
DOI：10.3404/j.issn.1672-7649.2024.13.001
分类号：O346.1
作者简介：黄如旭(1987-),男,研究员,研究方向为海洋工程结构疲劳与断裂
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