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首页> 外文会议>ASME international design engineering technical conferences and computers and information in engineering conference 2014 >SIMULATING ASSEMBLY GEOMETRIC AND STRESS VARIATION CONSIDERING MACHINING-INDUCED RESIDUAL STRESS
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SIMULATING ASSEMBLY GEOMETRIC AND STRESS VARIATION CONSIDERING MACHINING-INDUCED RESIDUAL STRESS

机译：考虑机加工引起的残余应力的模拟几何和应力变化

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摘要

Nowadays, large monolithic machined parts are increasingly used in aerospace industry. Machining-induced residual stress usually dominates thin part's distortion. The resultant part input with mutual corresponding distortion pattern and inner residual stress has an impact on subsequent assembly geometric and stress variation of thin-walled structure. Final pre-stressed assembly state further affects product functionality. This paper illustrates a simulated methodology combining automatic scripting technique with a FEA tool to reveal the assembly variation's distribution and pattern caused by the fluctuation of machining-induced residual stress. A typical assembly unit case in aircraft is investigated by applying the proposed methodology, more specifically, considering the uncertainty of the dominant shear stress via simulating the normal distributed weights of basis functions. Moreover, the quantitative effect of introducing residual stress is explored to examine the applicability of traditional Method of Influence Coefficients, which constructs a sensitivity matrix of the linear relation between incoming part variation and output assembly variation using FEA. This study enhances the understanding of the effect of introducing residual stress into assembly and helps the statistical inference about both geometric and stress aspects.
机译：如今，大型整体加工零件越来越多地用于航空航天工业。机加工引起的残余应力通常主要控制薄零件的变形。具有相互对应的变形模式和内部残余应力的合成零件输入对薄壁结构的后续装配几何形状和应力变化有影响。最终的预应力组装状态会进一步影响产品功能。本文说明了一种将自动脚本技术与FEA工具相结合的模拟方法，以揭示由于加工引起的残余应力波动而引起的装配变化的分布和图案。通过应用所提出的方法来研究飞机的典型装配单元情况，更具体地说，是通过模拟基函数的正态分布权重来考虑主剪应力的不确定性。此外，还探讨了引入残余应力的定量效果，以检验传统影响系数方法的适用性，该方法使用有限元分析法构造了输入零件变化与输出装配变化之间线性关系的灵敏度矩阵。这项研究增进了对将残余应力引入装配体的效果的理解，并有助于对几何和应力方面的统计推断。

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  • 来源
  • 会议地点 Buffalo NY(US)
  • 作者

    Lina Zhang; Hua Wang; Shuhui Li;

  • 作者单位

    State Key Laboratory of Mechanical System and Vibration Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures. Department of Mechanical Engineering Shanghai Jiao Tong University Shanghai, 200240, P.R. China;

    State Key Laboratory of Mechanical System and Vibration Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures. Department of Mechanical Engineering Shanghai Jiao Tong University Shanghai, 200240, P.R. China;

    State Key Laboratory of Mechanical System and Vibration Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures. Department of Mechanical Engineering Shanghai Jiao Tong University Shanghai, 200240, P.R. China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    assembly variation; residual stress; machining; FEA;

    机译：装配变化残余应力加工;有限元分析;

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