き裂進展に及ぼす複数のき裂の相互作用

概要

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There is interaction among multiple cracks which are initiated in a plane surface by fatigue or environmentally assisted cracking. And it is observed that these cracks may coalesce as they approach each other. In this study, the interaction of multiple cracks with different relative locations and lengths was evaluated using a finite element method. Furthermore a program which would generate a finite element mesh depending on their different locations and lengths was developed. This program then was used to simulate the growth of two cracks as their distance is getting smaller, with their unsteady interaction taken into consideration. The simulation provided new knowledge about two cracks whose growth reduces their distance ; when two cracks are not brought into coalescence, the interaction due to their greater contiguity makes the outer crack tips of the two cracks grow faster than a single crack. And the time to fracture involving two contiguous cracks becomes almost the same as the time required for coalesced cracks to lead to fracture. Finally, Monte Carlo simulations were performed to reproduce the crack initiation and growth on a computer. The simulation gave a realistic distribution form which shows that multiple cracks lie abreast on the surface.
一般社団法人日本機械学会の論文
2000-08-25