| 有限差分法在铸造应力场模拟中的应用 |
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| 引用本文： | 廖敦明,陈立亮,周建新,刘瑞祥.有限差分法在铸造应力场模拟中的应用[J].华中科技大学学报(自然科学版),2011(1):45-49. |
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| 作者姓名： | 廖敦明 陈立亮 周建新 刘瑞祥 |
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| 作者单位： | 华中科技大学材料成形与模具技术国家重点实验室; |
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| 基金项目： | 国家自然科学基金资助项目(50805056); 教育部留学回国人员科研启动基金资助项目(2009); 国家科技重大专项基金资助项目(2009ZX04014-082) |
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| 摘 要： | 基于单向热-力耦合模型,用有限差分法(FDM)进行温度场模拟,将所求得的温度结果作为体载荷施加到应力分析的三维模型中,采用不同差分格式对控制方程进行离散,计算应力应变,开发出FDM/FDM铸件热应力场数值模拟系统.该系统使得铸造应力应变分析与传热分析使用同一FD网格模型,避免了采用不同模型进行热-力耦合分析时的结点匹配问题,减小由此产生的单元温度载荷传递误差.采用实际铸件进行了浇注实验和残余应力测试试验,模拟结果与实际情况一致,表明FDM可以用来模拟铸件残余应力的形成和预测热裂产生的倾向.
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| 关 键 词： | 热应力 裂纹 有限差分法 离散 铸造 凝固过程 |
Application of FDM in casting thermal stresses simulation |
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| Liao Dunming Chen Liliang Zhou Jianxin Liu Ruixiang.Application of FDM in casting thermal stresses simulation[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,2011(1):45-49. |
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| Authors: | Liao Dunming Chen Liliang Zhou Jianxin Liu Ruixiang |
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| Institution: | Liao Dunming Chen Liliang Zhou Jianxin Liu Ruixiang(State Key Lab of Material Processing and Die and Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China) |
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| Abstract: | Based on unilateral thermal-force coupling model,the heat transfer was simulated by finite difference method(FDM),then taking the temperature result as thermal load added onto the 3D model the stress and strain were calculated and various difference scheme were adopted to discrete the control equations.A FDM/FDM numerical simulation system was developed to analyze temperature and stresses fields during casting solidification process.When adopting FDM,thermal analysis and stress analysis can use the same FD ... |
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| Keywords: | thermal stress crack finite difference method(FDM) discrete casting solidification process |
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