Interaction of Edge and Internal Cracks In a Rotor Steel

概要

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The interaction of edge and internal cracks under a tensile load has been investigated using a Ni-Cr-Mo-V alloy rotor forging at - 75℃. Four kinds of crack configurations were used ; all the specimens has one internal crack and one edge crack. The length of the internal crack was kept constant but the length of the latter as well as the distance between cracks was varied systematically. At each crack tip, K_I value was estimated by the FEM calculation and the strength zone width, SZW, was measured. SZW at crack tips mutually interacting was larger than the predicted value from Bates' relation using the K_I values, although at the innermost tip, SZW and K_I values were well correlated by the relation. The influence of the internal crack on the edge one became larger as the edge crack became shorter.
一般社団法人日本機械学会の論文