Modeling of Creep-Fatigue Crack Propagation in Hastelloy X Considering Three Stages of Creep

被引：0

作者：

Zhang J. ^{[1
,2
]}

Li Z. ^{[1
]}

Lin J. ^{[1
]}

Yu Y. ^{[1
]}

Dai H. ^{[1
]}

机构：

[1] State Key Laboratory of Engines, Tianjin University, Tianjin

[2] School of Mechanical Engineering, Tianjin Ren’ai College, Tianjin

来源：

Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2024年 / 57卷 / 03期

基金：

中国国家自然科学基金;

关键词：

constitutive model; crack growth; creep-fatigue; finite element simulation; Hastelloy X;

D O I：

10.11784/tdxbz202212009

中图分类号：

学科分类号：

摘要：

A constitutive model that incorporates the three stages of creep was proposed by combining the strain hardening law with continuum damage mechanics. This model was used in finite element simulations of crack propagation in Hastelloy X CT specimens at 650 ℃. The influence of various creep stages on the pure creep crack propagation behavior was compared. The constitutive model was also applied in simulations of creep-fatigue crack propagation considering the three stages of creep. The impact of load amplitude，load ratio，and hold time on the crack growth rate，as well as the contribution of each loading condition to damage accumulation during crack propagation，were investigated. The findings reveal a high correlation between the constitutive model which considers all creep stages and the experimental results in pure creep crack propagation simulations. As the load escalated from 5 kN to 7 kN，there was an increase from 0.57 to 0.61 in the average prediction differences of crack propagation rate considering creep stages Ⅰ and Ⅱ，whereas the average prediction differences considering creep stage Ⅱ and considering creep stages Ⅱ and Ⅲ witnessed a decrease from 0.67 to 0.64 and from 0.16 to 0.07，respectively. The creep-fatigue crack propagation simulation demonstrated that as the load amplitude increased from 5 kN to 7 kN or the load ratio increased from 0.01 to 0.50，the crack growth rate increased for the former and decreased for the latter. The da/dt-Ct, avg curve’s slope remained virtually unchanged，but the proportion of creep damage increased and those of fatigue and interaction damage decreased. Creep damage had the most significant effect on the results of each loading case，followed by interaction damage，whereas fatigue damage had the least impact. As the hold time was extended from 1 s to 1 800 s，the cycle-related crack propagation rate grew，the time-related propagation rate fell，and the slope of the da/dt-Ct, avg curve increased. Creep damage increased，fatigue damage decreased，and interaction damage initially rose and then declined. The proportion of each damage was approximately equal at a hold time of 10 s，but fatigue damage accounted for 83% at a hold time of 1 s and creep damage accounted for 96% at a hold time of 600 s. © 2024 Tianjin University. All rights reserved.

引用

页码：321 / 333

页数：12

共 32 条

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