Simulation of thermal deformation of cylindrical mechanical parts bounded by boundary constraint based on conversion mechanism of thermal into mechanics

MIAO En-ming; XU Zhi-shang; ZHOU Xiao-shuai; LEI De-rong; NI Yang

doi:10.3788/OPE.20152302.0504

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Simulation of thermal deformation of cylindrical mechanical parts bounded by boundary constraint based on conversion mechanism of thermal into mechanics

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- Simulation of thermal deformation of cylindrical mechanical parts bounded by boundary constraint based on conversion mechanism of thermal into mechanics
- Optics and Precision Engineering Vol. 23, Issue 2, Pages: 504-510(2015)
- 作者机构：
  
  1. 合肥工业大学仪器科学与光电工程学院,安徽合肥,230009
  2. 中国石油新疆油田分公司, 工程技术研究院,新疆克拉玛依,834000
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152302.0504
  CLC： TH161.24
- Received：04 April 2014，
  
  Revised：28 May 2014，
  
  Published：25 February 2015
- 稿件说明：
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苗恩铭, 徐祗尚, 周小帅等. 基于热力转换机理仿真圆柱体零件形体边界约束的热变形[J]. 光学精密工程, 2015,23(2): 504-510

MIAO En-ming, XU Zhi-shang, ZHOU Xiao-shuai etc. Simulation of thermal deformation of cylindrical mechanical parts bounded by boundary constraint based on conversion mechanism of thermal into mechanics[J]. Editorial Office of Optics and Precision Engineering, 2015,23(2): 504-510
苗恩铭, 徐祗尚, 周小帅等. 基于热力转换机理仿真圆柱体零件形体边界约束的热变形[J]. 光学精密工程, 2015,23(2): 504-510 DOI： 10.3788/OPE.20152302.0504.

MIAO En-ming, XU Zhi-shang, ZHOU Xiao-shuai etc. Simulation of thermal deformation of cylindrical mechanical parts bounded by boundary constraint based on conversion mechanism of thermal into mechanics[J]. Editorial Office of Optics and Precision Engineering, 2015,23(2): 504-510 DOI： 10.3788/OPE.20152302.0504.

摘要

提出了热变形精确分析理论与一种仿真方法以保证热误差影响下机械零件的最佳配合。从微观分子力学理论出发

在充分考虑材料属性、温度以及形体边界约束对热变形影响的基础上

提出了热力转换热变形分析理论

将零件热变形问题等效为力变形问题。针对一组铝制空心圆柱体零件进行了热变形测量实验

给出了基于ANSYS Workbench仿真环境的热力转换热变形仿真方法

并对比分析了实验结果与仿真结果。结果显示:铝制空心圆柱体零件受高温变形时

不同内外径尺寸的空心圆柱体其热膨胀系数是不相同的;外圆径向热膨胀系数大约是内圆径向热膨胀系数的2倍;基于热力转换理论的仿真结果与实验结果吻合较好

吻合度达到98%以上

验证了热力转换热变形分析理论的合理性和有效性。提出的方法弥补了ANSYS Workbench传统热分析完全忽略形体边界约束影响零件热变形的缺陷

为后期热鲁棒性结构设计提供了重要参考。

Abstract

An accurate analysis theory of thermal deformation and a simulation method were proposed to ensure the optimum performance of mechanical aparts affected by thermal errors. From the view of microscopic molecular mechanics theory

an analysis theory of conversion of thermal into mechanics for thermal deformation was put forward

by which the thermal deformation of a part was equivalent to the force deformation by taking the effect of material properties

temperatures and the boundary constraints of shape on thermal deformation into account fully. Then

measurement experiments of thermal deformation of hollow cylinder parts were carried out

and a simulation method of thermal deformation based on ANSYS Workbench was given. Finally

simulation and experiment results were compared. The results show that thermal expansion coefficients of the outer circle are approximately twice that of the inner circle in the radial direction when an aluminum alloy hollow cylinder part is deformated under a high temperature. Meanwhile

the simulation results based on the proposed theory are consistent with the experimental results very well and the fit is more than 98%

which validates the rationality of our theory. As the method makes up the drawback that traditional thermal analysis of ANSYS Workbench completely ignores the physical boundary constraints affecting part thermal deformation

it provides an important reference for the structure design of thermal robustness subsequently.

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Keywords

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