| Author Name | Affiliation | | YU Xue-mei | College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China
AVIC Harbin Aircraft Industry Group Co.LTD.,Aircraft Design Institute,Harbin 150060,China | | TANG Li-qiang | College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China | | YANG Yong | College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China |
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| Abstract: |
| Spherical cavity expansion model is often used to study the mechanic characteristics of pressure sensitive mediums. The most important one we do in the paper is that we construct a four-region model with σθ≠0 in damage region,which is different from what Satapathy did before and is more reasonable. By adopting this model,different constitutive equations were constructed by different method-elastic mechanics in elastic region,damage mechanics and fracture mechanics in damage region,and macro-micro mechanics theory in plastic region. Then using Durban’s self-similarity assumption,the control differential equations with boundary conditions were established,and the static numerical solution of stress field and displacement field in the three different regions of elastic,damage and plastic area were discussed respectively. Results showed that this four-region model can describe precisely the mechanic characteristics of pressure sensitive mediums under initial pressure. |
| Key words: pressure-sensitive material spherical cavity expansion damage mechanics self-similarity assumption constitutive equation |
| DOI：10.11916/j.issn.1005-9113.2010.03.021 |
| Clc Number:O346.5 |
| Fund: |
