期刊
MATERIALS
卷 15, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/ma15062156
关键词
fatigue crack growth; residual stresses; crack closure; crack tip plastic strain
类别
资金
- Portuguese Foundation for Science and Technology (FCT) [PTDC/EME-EME/31657/2017]
- European Regional Development Fund (ERDF) through the Portugal 2020 program
- Centro 2020 Regional Operational Programme [CENTRO-01-0145-FEDER-031657, UIDB/00285/2020]
- Fundação para a Ciência e a Tecnologia [PTDC/EME-EME/31657/2017] Funding Source: FCT
This study numerically investigated the effect of thermal residual stresses (TRSs) on fatigue crack growth (FCG), revealing that compressive stresses delay FCG while tensile stresses accelerate it. The research also found that TRSs only affect FCG by changing the crack closure level.
Residual stresses affect the fatigue behavior, given that compressive stresses delay the phenomenon, while tensile stresses accelerate it. However, the mechanisms behind the effect of residual stresses are not totally understood. A numerical study is developed here to understand the effect of thermal residual stresses (TRSs) on fatigue crack growth (FCG). The crack driving force was assumed to be the cumulative plastic strain at the crack tip. The heating of a region ahead of the crack tip produced elastic compressive TRS, which were 69% of material's yield stress. Alternatively, plastic deformation was produced by severe cooling followed by heating to generate compressive residual stresses. The crack propagation in the compressive residual stress field produced a decrease in the FCG rate. On the other hand, without the contact of crack flanks, the TRS showed no effect on FCG. Therefore, the TRSs only affect FCG by changing the crack closure level.
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