应力场常数项对Ⅰ型裂纹起裂扩展行为影响  

Influence of constant T stress on mode-I crack propagation behavior

作　　者：黄如旭[1] 谢晓忠 陈沙古[1] 万正权[1] HUANG Ruxu;XIE Xiaozhong;CHEN Shagu;WAN Zhengquan(State Key Laboratory of Deep-sea Manned Vehicles,China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心深海载人装备国家重点实验室,江苏无锡214082

出　　处：《舰船科学技术》2024年第13期1-8,共8页Ship Science and Technology

摘　　要：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 Tstress 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.

关 键 词：常数项 混合型裂纹 Ⅰ型裂纹 裂纹偏折 断裂准则 

分 类 号：O346.1[理学—固体力学]