環状切欠部に生じた表面疲労き裂進展速度に関する弾・塑性破壊力学的解析

概要

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The stress-strain response was analyzed in the cross section of circumferentially notched specimens of root radii of 2, 3 and 5 mm by F. E. M.. Then, the cyclic J-integral range, ΔJ and the strain intensity factor range, ΔK_ε were estimated for the surface crack, where the stress and strain gradients were taken into account in the cross sections of the notched specimens. The crack shape was estimated by assuming that the crack extends so that the values of ΔJ or ΔK_ε become the same along the crack front. The analysis was in quite good agreement with the test result. The growth rate of the surface crack was successfully plotted against the J-integral range and the strain intensity factor range estimated using the axial and the equivalent stress-strain responses around the notch root.
一般社団法人日本機械学会の論文
1989-04-25