The effect of constraint on CTOD fracture toughness of API X65 steel
The effect of constraint on CTOD fracture toughness of API X65 steel
复制标题
DOI：
10.1016/j.engfracmech.2014.04.014
复制
发表时间：
2014-07
影响因子：
5.4
通讯作者：
Kejiang Han;J. Shuai;X. Deng;L. Kong;Xing Zhao;M. Sutton
中科院分区：
文献类型：
--
作者：
Kejiang Han;J. Shuai;X. Deng;L. Kong;Xing Zhao;M. Sutton
研究了裂纹尖端的约束条件和试件厚度对SENB试件临界CTOD(CTOD)的影响。利用Gurson型孔洞模型定量了约束对CTOD断裂韧性的影响。基于SENB试件厚度对CTOD断裂韧性的影响和裂纹尖端的应力约束，提出了APIX65钢基于约束的断裂失效准则。与已有试件和管道的有限元模拟结果相比，基于约束的断裂失效准则的预测误差在10%以内。
Constraints ahead of crack tips and the effect of specimen thickness on the critical CTOD (the CTOD fracture toughness) in SENB specimens are studied. The effect of constraint on CTOD fracture toughness is quantified using a Gurson type void model. Based on the effect of the SENB specimen thickness on CTOD fracture toughness and on the stress constraint ahead of the crack tip, a constraint-based fracture failure criterion for API X65 steel is proposed. Compared with the results of finite element simulations of SENT specimens and pipelines, prediction errors of the constraint-based fracture failure criterion are within 10%.