交差貫通穴材における疲労き裂伝ぱ挙動

概要

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Fatigue crack propagation behavior was observed by means of the beach mark method on the fracture surface. In the specimen with perpendicularly intersecting two holes, the fatigue crack was initiated at the internal corners of two holes and propagated from the internal section to the outside. In the first stage of crack propagation, the crack front formed a straight line and the cracked area in the form of a triangle was observed. This shape gradually changed with the crack propagation. In the final stage of crack propagation, a parabola-like crack front was observed. The crack propagation was examined with the change in the cracked area S. The crack propagation rate of the area, dS/dN, was found to be proportional to the area S, and the crack propagation law could be expressed as dS/dN=CΔσ^nS (Δσ is the cyclic stress range, n and C are constant).
一般社団法人日本機械学会の論文
1992-09-25