Surface versus internal fatigue crack initiation in steel: Influence of mean stress
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- 作者：Vidit Gaura ; b ; gaur.vidit@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Vé ; ronique Doqueta ; doquet@lms.polytechnique.fr" class="auth_mail" title="E-mail the corresponding author ; Emmanuel Persentb ; Charles Mareauc ; Elé ; onore Roguetb ; Jean Kitteld
- 关键词：Mean stress ; Internal crack ; Steel ; Defects ; Fish-eye
- 刊名：International Journal of Fatigue
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：82
- 期：part_P3
- 页码：437-448
- 全文大小：4297 K
文摘
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High-cycle fatigue tests were run at R ratios between −1 and 0.7 on 2.5%Cr–1%Mo steel.
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A shift in the crack initiation sites, correlated with a change in R ratio was found.
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Elastic–plastic F.E. computations and fracture mechanics can explain this shift.
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Internal cracks grew at very low ΔK with apparently with very limited closure effects.
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The threshold ΔK for internal cracks did not change with R between −0.5 and 0.25.