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| Growth and its new model of voids with different shape in triaxial stress fields |
| Revised:December 29, 1998 |
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| DOI：10.7511/jslx20004082 |
| KeyWord:void,stress triaxiality,shape,cell,gro( |
| LI Zhen\|huan 1 KUANG Zhen\|bang 2 ZHANG Ke\|shi 3 |
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| Abstract: |
| By means of controlling the macroscopic stress triaxiality of the cell, the finite element (FE) simulation analyses have been carried on the growth mechanism of voids with different shape in the wide triaxial stress fields from the smooth bar to the crack sample. The FE calculation results show: (1)the shape change and volume change are two kinds of basic mechanism of void growth, and their uses to voids growth are different in the different samples with different stress triaxiality levels. (2)the known void growth models presented by other researcher have larger error describing void growth in different samples. Based on these, in the present paper, the authors present a new void growth model. Compared with other known four kinds model, the new model can response the comprehensive use of shape change and volume change to the void developing, so it can describe effectively the void growth in different triaxial stress fields, and this new model can response the change of fracture mechanism of materials in different sample. |
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