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

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