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Title of article :
Three-dimensional effects on fatigue crack closure under fully-reversed loading
Author/Authors :
Carlyle، نويسنده , , Adam G. and Dodds Jr.، نويسنده , , Robert H.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
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Abstract :
For extension of fatigue cracks at engineering length-scales, the increase in crack opening loads (Kop) caused by plasticity-induced closure plays a key role in estimates of growth rates in structural metals. Under conditions of small-scale yielding, our prior work reveals the existence of a similarity scaling parameter, K ¯ = K max / σ 0 B , that scales the effects of differing peak load (Kmax), specimen thickness (B), and material yield stress (σ0) on Kop/Kmax across varying materials and loading levels. This work explores the applicability of the scaling parameter to specimens under fully-reversed (i.e. R = −1) cyclic fatigue loading. Numerical results again show that the magnitude of Kop/Kmax at each location along the crack front remains unchanged when Kmax, thickness, and material yield stress all vary to maintain a fixed value of K ¯ .
Keywords :
3-D finite element analysis , Crack closure , Fatigue , Small-scale yielding , Similarity scaling , Stress ratios , Fully-reversed loading
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