About this Abstract |
| Meeting |
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
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| Symposium
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11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
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| Presentation Title |
A Susceptibility Index for Stress Relaxation Cracking: Monkman-Grant Analysis and Example Study |
| Author(s) |
Yanfei Gao, Xiaping Fan, Jorge Penso, Zhili Feng |
| On-Site Speaker (Planned) |
Yanfei Gao |
| Abstract Scope |
The stress relaxation cracking (SRC) has been commonly observed with HAZ cracks during PWHT or under service conditions. The synergy among residual stress evolution, microstructural evolution, and damage accumulation makes it difficult to develop an engineering design approach. The premise of this work is that failure strain asymptotes can be extracted from standard creep tests, which can be combined with a linear cumulative damage law to derive the lifetime under variable stress history. Therefore, we can now decouple (i) the effects of microstructural evolution on material degradation and (ii) the measurements of stress relaxation. The elastic follow-up gives a time scale, while metallurgical factors can be lumped into the Monkman-Grant strain. An SRC susceptibility index is derived which depends on the initial stress level and the failure strain, which allows for a rapid screening of various materials in their SRC resistance. Three examples are given to validate our proposed approach. |
| Proceedings Inclusion? |
Undecided |