【作者】 黄辉；

【导师】 袁国定； 王匀；

【作者基本信息】 江苏大学 ， 机械制造及其自动化， 2006， 硕士

【摘要】 扁挤压筒作为生产大型铝型材整体壁板的重要组成部分，对其进行强度分析和优化，改善其工况具有重要的实际意义。本文主要采用数值模拟与物理模拟相结合的方法，对扁挤压筒的应力分布进行分析，并运用优化技术对其结构进行优化。研究工作主要如下：系统研究了有限元模拟的关键技术(包括二维和三维)以及理论求解公式，为后续的数值分析提供了技术条件和理论基础。在此基础上，建立了预紧组合式扁挤压筒的平面和实体有限元模型，应用接触单元和耦合方法，对组合式扁挤压筒进行了数值模拟，并采用间接顺序法解决了扁挤压筒的热一结构耦合分析。分别考虑扁挤压筒单独受预紧力、热载荷，以及内压．预紧和热．预紧．内压的耦合作用的情况，获得了接触应力、温度分布、等效应力分布、轴向应力分布、应力集中区等结果，并指出其产生原因。采用光弹性实验方法对扁挤压筒进行了物理模拟，验证了扁挤压筒的轴向与径向的应力分布。建立了结构优化数学模型并运用FEM对其进行优化，比常用的尝试法简单、快捷、准确度高；提出采用新的型腔结构代替传统的结构，并采用变过盈量预紧方式代替传统的预紧方式，缓解了扁挤压筒由于内孔形状不规则而导致的应力集中问题。更多还原

【Abstract】 Flat receptacle is one of the most important in producing the over-all aluminum wallboard profiles (wallboard or profile in short term). It is significant to study the strength analysis and improve the working condition of the flat receptacle. This literature mainly adopted both numerical simulation and physical simulation to analyze the stress distributing of the flat receptacle, and using optimization technology to optimize the structure. The main work of this literature is as follow:Firstly, the key technology of numerical simulation theory and stress equations is discussed to offer the technique support and theories to subsequent analysis (including 2D and 3D). Then, the planar and three-dimensional models of prestressed flat receptacle are built. Moreover, the numerical simulation for the flat receptacle is made by contact element and coupling method and the thermal-structure coupling is simulated by using the indirect ordinal approach. The flat receptacles under the conditions of pressure, prestress, thermal load and their coupling load are simulated respectively, and get the corresponding results and causes. Use the photoelastic experiment to prove the flexibility and the veracity of the results from the FEA.The model for structure optimization of the flat receptacle is built, and it is optimized by using the FEM. Adopting the suitable shape of the inner hole and the changeable shrinking range can alleviate the stress centralization caused by the especial shape of the inner hole.更多还原