@article{oai:nagoya.repo.nii.ac.jp:00030834, author = {Murakami, Sumio and Ohno, Nobutada}, issue = {2}, journal = {Memoirs of the Faculty of Engineering, Nagoya University}, month = {Mar}, note = {Constitutive and evolution equations of creep and creep damage in polycrystalline metals are formulated by taking account of their microstructural mechanisms. The representation of the microstructural changes induced by creep damage in terms of a tensorial internal state variable and the oriented nature of the creep damage are first discussed. Then, by assuming that the effect of material damage in creep consists in the magnification of the stress effect due to internal fissures and voids, the constitutive and evolution equations for creep and creep damage are expressed as a set of tensorial functions of a net stress tensor and a damage effect tensor of rank two. These equations are specified in conformity with the experimental results reported so far. The relation between the present theory and the previous ones is also discussed. Finally, the present theory is applied to the creep damage analysis of a thin-walled tube subjected to non-steady combined tension and torsion.}, pages = {179--190}, title = {Constitutive equations of creep and creep damage in polycrystalline metals}, volume = {36}, year = {1985} }