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The influence of stress-regime dependent creep model and ductility in the prediction of creep crack growth rate in Cr–Mo–V steel
Highlights Stress dependent creep model and ductility are implemented in a creep damage model. Creep crack growth rate in Cr–Mo–V steel is predicted over a wide range of C *. Creep model and ductility for determining creep damage change with increasing C *. This change leads to the line segments of the da/dt − C * curves.
Abstract In this paper, the stress-regime dependent creep model and ductility have been implemented in a ductility exhaustion based damage model, and their influence on creep crack growth (CCG) behavior of materials have been analyzed. By using the stress-regime dependent creep model and ductility, the CCG rate in a Cr–Mo–V steel over a wide range of C * has been predicted by finite element analyses. The predicted CCG rates agree with the available experimental data in the literature. The analysis results show that with increasing C *, the creep model and ductility for determining crack-tip creep damage accumulation change from the low-stress regime model and ductility through a combination of low- and high-stress regime model and ductility to high-stress regime model and ductility. These changes lead to the line segments of the da/dt − C * curves. In CCG life analyses and designs of high temperature components, the stress-regime dependent creep model and ductility need to be used.
The influence of stress-regime dependent creep model and ductility in the prediction of creep crack growth rate in Cr–Mo–V steel
Highlights Stress dependent creep model and ductility are implemented in a creep damage model. Creep crack growth rate in Cr–Mo–V steel is predicted over a wide range of C *. Creep model and ductility for determining creep damage change with increasing C *. This change leads to the line segments of the da/dt − C * curves.
Abstract In this paper, the stress-regime dependent creep model and ductility have been implemented in a ductility exhaustion based damage model, and their influence on creep crack growth (CCG) behavior of materials have been analyzed. By using the stress-regime dependent creep model and ductility, the CCG rate in a Cr–Mo–V steel over a wide range of C * has been predicted by finite element analyses. The predicted CCG rates agree with the available experimental data in the literature. The analysis results show that with increasing C *, the creep model and ductility for determining crack-tip creep damage accumulation change from the low-stress regime model and ductility through a combination of low- and high-stress regime model and ductility to high-stress regime model and ductility. These changes lead to the line segments of the da/dt − C * curves. In CCG life analyses and designs of high temperature components, the stress-regime dependent creep model and ductility need to be used.
The influence of stress-regime dependent creep model and ductility in the prediction of creep crack growth rate in Cr–Mo–V steel
Zhang, J.W. (author) / Wang, G.Z. (author) / Xuan, F.Z. (author) / Tu, S.T. (author)
2014-09-25
8 pages
Article (Journal)
Electronic Resource
English
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