管桩预应力自动张拉机张拉部件的优化设计与疲劳寿命分析
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TU757.3

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国家科技部创新方法专项(2016IM020200-03)


Optimization Design and Fatigue Life Analysis of the Tensioning Parts of Prestressed Pipe Automatic Tensioning Machine
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National science and technology ministry innovation method special project

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    摘要:

    针对现有管桩预应力张拉机的张拉部件因疲劳强度不足而引起断裂问题,设计了合抱式张拉部件,并结合实际生产工况进行了疲劳寿命分析和结构优化。以提高系统的响应速度为目标对张拉部件进行了轻量化的结构优化设计;考虑到其受到的变幅载荷是随机的,得到的疲劳寿命具有较大的离散性,且在前期优化设计中变幅载荷曲线难以准确获取,故对张拉部件进行了寿命预测和疲劳强度评估,将变幅载荷转化为峰值的恒幅载荷条件分析了其疲劳寿命。通过结合改善变截面处应力集中等方法,结果表明:重量减轻了3.5%,疲劳寿命提升了15.5%。本研究对优化设计方案的疲劳寿命预测与评估有工程实用价值,可为张拉机的设计与工程化提供参考。

    Abstract:

    With respect to the fracture of the tensioning parts of prestressed pipe automatic tensioning machine caused by the insufficient fatigue strength, the embracing tensioning parts are designed, and the fatigue life analysis and structural optimization are carried out in combination with the actual production conditions. In order to improve the response speed of the system, a lightweight structural optimization design is carried out for the tensioning parts. Considering that the variable amplitude load is random, the fatigue life obtained is quite discrete, and it is difficult to obtain the variable amplitude load curve accurately in the preliminary optimization design. The fatigue life and strength of tensioned parts is analyzed by transforming the variable amplitude load into the constant amplitude load of the peak value.The results show that the weight is reduced by 3.5% and the fatigue life is increased by 15.5%. Research on fatigue life analysis method of the variable amplitude load of the tensioning parts has practical engineering value for fatigue life prediction and evaluation of optimal design schemes,and can provide reference for the design and engineering of tensioner.

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汤亮,杜卫东,龚发云,等. 管桩预应力自动张拉机张拉部件的优化设计与疲劳寿命分析[J]. 科学技术与工程, 2020, 20(28): 11746-11754.
tangliang, duweidong, 龚发云,et al. Optimization Design and Fatigue Life Analysis of the Tensioning Parts of Prestressed Pipe Automatic Tensioning Machine[J]. Science Technology and Engineering,2020,20(28):11746-11754.

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  • 收稿日期:2019-10-13
  • 最后修改日期:2020-06-25
  • 录用日期:2020-03-25
  • 在线发布日期: 2020-11-03
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