Title: Numerical investigations on the effects of T-stress in creep crack
Abstract:The influence of T -stress on creep crack tip stress field is studied based on finite element method in this paper. The modified boundary layer (MBL) formulation is introduced and used for the power-l...The influence of T -stress on creep crack tip stress field is studied based on finite element method in this paper. The modified boundary layer (MBL) formulation is introduced and used for the power-law creeping solids. The influences of T -stress on the creep zone and creeping fracture parameters are presented with MBL formulation and the T -stress affected creep crack tip field is also compared with the elastic field. Under the MBL formulation, the stress field for creep crack tip is investigated under different levels of T -stress. It can be found that lower negative T -stress violate the HRR singularity and elastic field greatly in creep crack tip field. The near crack tip stress field under large positive T -stress still obeys HRR singularity, while the far field is not the accurate elastic field any more. The creep zone size is also influenced by T -stress, and the small negative T -stress has the larger creep zone than that of larger T -stress at the same creep time. A novel parameter is proposed to characterize the creep zone considering the influence of T -stress on C (t) or C *-integral. For the same stress intensity factor with different T -stress levels, the constraint parameter Q under small scale creep is demonstrated to be described by a three order polynomial function of T /s 0 . The research shows that the constraint parameter Q of creep crack for specimens is also verified to rely on T -stress level.Read More
Publication Year: 2017
Publication Date: 2017-06-30
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot