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| Research on an adaptive meshless thermo-elasto-plastic contact model |
| Received:April 19, 2007 |
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| DOI：10.7511/jslx20095007 |
| KeyWord:thermo-elasto-plastic contact adaptive meshless method temperature-dependent yield strength |
| Author | Institution |
| 张征 |
西北工业大学 机电学院,西安 |
| 刘更 |
西北工业大学 机电学院,西安 |
| 刘天祥 |
西北工业大学 机电学院,西安 |
| 佟瑞庭 |
西北工业大学 机电学院,西安 |
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| Abstract: |
| An adaptive meshless model is proposed to solve two-dimensional thermo-elasto-plastic contact problems. The strain energy gradient-based error estimation and the local adaptive refinement strategy for the adaptive meshless element-free Galerkin-finite element (EFG-FE) coupling method are combined with linear programming technique-initial stiffness method for contact problem. The model’s principle explanation, arithmetic analysis and numerical implementation are given. The example of rigid cylinder contacting with an elasto-plastic plane is analyzed to validate the adaptive meshless model. The thermal effects on the contact pressure, stresses distributions with different input parameters under the thermo-elasto-plastic contact conditions are discussed. The examples, which have considered the different conditions such as strain-hardening property of the materials, the frictional force and the frictional heat inputs and temperature-dependent yield strength, are also computed. According the two examples, the results of the contact pressures and the stresses distributions obtained from the last refinement stage nearly approach those from the uniformly refined solutions, while the cost of the CPU time for the adaptive refinement model is only about 7%-10％ of that for the uniform refinement model. The results indicate that the adaptive refinement model is accuracy and efficient. |
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