| 摘要: |
| 当前采用的温度场热源数值模型在准确表征焊接过程材料性能和产热机制与温度变化关系上存在困难。依据摩擦学原理,以材料屈服强度ReL为产热基本参数建立新型热源模型,产热量随温度、材料性能改变,实现搅拌摩擦焊产热自适应过程,更准确地描述了搅拌摩擦焊过程物理现象的本质。温度场试验与模拟结果的比较表明,该热量自适应热源模型具有较高的计算精度。 |
| 关键词: 搅拌摩擦焊 温度场 热源模型 数值模拟 |
| DOI： |
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| Auto-adapting heat source model for numerical analysis of friction stir welding |
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LI Hong-ke, SHI Qing-yu, ZHAO Hai-yan, LI Ting
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Department of Mechanical Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, China
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| Abstract: |
| The heat generation mechanism and dependency of material properties on temperature can' t be fully characterized by the heat source models used now.According to friction mechanics, a heat generation model based on yield strength was established.The model can make auto-adaptation to material property and temperature variation and represent the physical nature during FSW process. Comparison between experiment of thermal field and simulation results indicates that the accuracy is quite good for this new heat model. |
| Key words: friction stir welding temperature field heat source model numerical simulation |
