コースティック法による破壊靱性計測の精度に及ぼす塑性変形の影響

概要

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In order to investigate the effect of plastic deformation near a crack tip on the accuracy of the measurement of static and dynamic fracture toughnesses by the caustic method, a two-dimensional finite-element simulation of fracture toughness tests is performed. A crack subject to a static or dynamic uniform pressure on its surfaces is considered, and caustics in reflection are generated by assuming the plane stress condition. Crack propagation is simulated by the node release technique. The numerical errors due to the node release technique are eliminated by truncating high-frequency components in the solution of displacements. It is found that the plastic deformation near a crack tip under static loadig has a greater effect on the "measured" stress intensity factor than that under impact loading. For impact loading, the smallness of the stress-intensity-factor-controlled field is found to be more important than the effect of plastic deformation.
社団法人日本機械学会の論文
1994-10-25