Fatigue crack growth in miniature specimens: The equivalence of ΔK-correlation and that based on the change in net-section strain energy density

SCRIPTA MATERIALIA

卷:122

Article

Chandran, K. S. Ravi¹  Cao, F.¹  Newman, J. C., Jr.² 

[1] Univ Utah, Dept Met Engn, Salt Lake City, UT 84112 USA

[2] Mississippi State Univ, Dept Aerosp Engn, Starkville, MS 39759 USA

关键词: Fatigue;    Crack growth;    Net-section;    Strain energy;    Stress intensity factor;   

DOI  :  10.1016/j.scriptamat.2016.05.018

来源: Elsevier

【 摘 要 】

In fatigue crack growth experiments of miniature specimens of Ti-6Al-4V alloy, it is shown that the stress intensity factor range (Delta K) cannot uniquely correlate the crack growth rates based on the standard stress intensity factor solution, but can only on the basis of the solution for uniformly displaced ends. It also is shown that, remarkably, a similar and strong correlation exists between the change in the net section strain energy amplitude and the rate of fatigue crack growth. The proposed approach is direct and simpler and it throws a new light on the nature of driving force for fatigue crack growth in structural materials. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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