Osamu Okuno and Ishi Miura1
1Institute of Medical and Dental Engineering, Tokyo Medical and Dental University, Tokyo
Ductile fracture analysis by Monte Carlo simulation is carried out for square model that contains randomly distributed voids under uniaxial tension. It is assumed that the coalescence of voids is the results of internal necking or shear crack between voids. Ductile fracture strain and surfaces are computed. The following results are obtained. (1) The coalescence between adjascent voids occurs by internal necking. The coalescent mechanism between comparatively remote voids is shear crack. Predicted fracture surfaces are coincident well with observed one. (2) At high volume fraction of voids, internal necking occurs predominantly. And decrease the volume fraction of voids, shear crack increases. (3) On the first stage of flow, internal necking tends to occur. On the latter stage of flow, shear crack occurs frequently. (4) Relation between ductile fracture strains and volume fraction of voids is in good agreement with the experimental results for copper dispersion alloys by Edelson and Baldwin.
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