Characterization of creep constraint effects on creep crack growth behavior by Q-type parameters

被引：2
|
作者：
Zhao, Lei [1 ,2 ]
Wu, Yan [1 ,2 ]
Xu, Lianyong [1 ,2 ,3 ]
Han, Yongdian [1 ,2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China
[2] Tianjin Key Lab Adv Joining Technol, Tianjin 300350, Peoples R China
[3] Tianjin Univ, State Key Lab Engines, Tianjin 300350, Peoples R China
来源：
ENGINEERING FRACTURE MECHANICS | 2023年 / 279卷
基金：
中国国家自然科学基金;
关键词：
Creep crack growth; Creep constraint; Finite element; Stress triaxiality; TIP CONSTRAINT; TEST SPECIMENS; PREDICTION; FRACTURE; FIELDS; STEEL; SIZE; 316H;
D O I：
10.1016/j.engfracmech.2022.109015
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The effect of creep constraint on creep crack growth behavior and the stress field around the creep crack-tip was studied under different specimen geometry conditions. The correlation between the constraint parameters Q and Qm with the stress triaxiality under creep conditions was investi-gated. The results showed that the Q and Qm depend linearly on the stress triaxiality. Moreover, based on the existing constraint parameters Q* and Qm, a new load-independent constraint parameter Q*m was proposed to quantify the creep constraint effect. The Q*m was superior to Q* in quantifying higher out-of-plane creep constraints induced by specimen width and thickness. Furthermore, the Q* and Q*m were employed to correlate with the normalized creep crack growth rate and initiation time. Finally, the constraint-dependent creep crack growth prediction model based on constraint parameters Q* and Q*m had been established.
引用
收藏
页数：19
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