2022-08-07T16:07:16Zhttps://nagoya.repo.nii.ac.jp/oaioai:nagoya.repo.nii.ac.jp:000103422021-03-01T19:30:30ZProposal of New Stability-instability Criterion for Crack Extension Based on Crack Energy Density and Physical Systematization of Other CriteriaWATANABE, Katsuhiko31368AZEGAMI, Hideyuki31369FractureStability-instability CriterionTearing ModulusCrack ExtensionCrack Energy DensityA new stability-instability criterion (named T_ε(T^*_ε) criterion) for crack growth which is \napplicable to small scale yielding cracks and also to large scale yielding cracks is proposed\n based on crack energy density concept. T_ε criterion is a criterion in which attention is paid to the rate of variation of crack energy density at a crack tip point of every moment, and T^*_ε criterion is another version of T_ε criterion and is a criterion in which attention is paid to the rate of variation of crack energy density at a fixed point which will be a new crack tip point after extension. The relations between T_ε(T^*_ε) criterion and other known criteria (criterion based on g-R-a curves; T_j, T_δ and T_W criteria) are also discussed and it is shown that the physical meanings of other criteria can be made clear and all criteria can be systematized based on the new criterion.journal article日本機械学会1985-12application/pdfBulletin of JSME2462828732880http://hdl.handle.net/2237/121620021-3764https://nagoya.repo.nii.ac.jp/record/10342/files/110002358293_Proposal_of_new_stability-instability.pdfenghttp://ci.nii.ac.jp/naid/110002358293/日本機械学会本文データは学協会の許諾に基づきCiNiiから複製したものである