但 敏,熊翰韬,金玉阳,杨程皓.多层连接结构的轴向应力分布的数值计算与试验[J].航空发动机,2024,50(3):107-113
多层连接结构的轴向应力分布的数值计算与试验
Numerical and Experimental Investigation of Axial Stress Distribution in Multi-layer Connection Structures
  
DOI:
中文关键词:  航空发动机  多层连接结构  轴向应力分布  分布模型
英文关键词:aeroengine  multi-layer connection structure  axial stress distribution  distribution model
基金项目:中央高校基本科研项目(3122023015)资助
作者单位
但 敏,熊翰韬,金玉阳,杨程皓 中国民航大学 航空工程学院天津 300300 
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中文摘要:
      为了解多层连接结构的轴向应力分布,从双层法兰螺栓连接结构连接轴向载荷分布着手,建立了被连接件轴向应力分 布的中空椭球体分布模型,推导出被连接件的轴向连接刚度理论表达式;并进行了连接结构扭矩与预紧力关系的试验及压力分布 测试试验;将该模型应用于航空发动机多层法兰连接结构,采用数值模型和试验方法对中空椭球体模型进行验证。结果表明:测 试试验件预紧力与力矩呈正相关,且拧紧系数约为0.2,可满足工程中无润滑条件下螺栓拧紧力矩系数的经验值;连接界面接触范 围随扭矩的增大先增大到一定范围后保持不变;与被连接件轴向应力分布的试验测试结果相比,采用改进的中空椭球体模型和原 中空圆锥体模型的计算结果的最大误差分别为9.42%和21.97%,证明了改进的中空椭球体分布模型的精度较高。
英文摘要:
      To analysis the axial stress distribution of multi-layer connection structures,starting from the axial load distribution of double flange bolt connection structures,a hollow ellipsoid distribution model of axial stress distribution of connected parts was proposed, and the theoretical expression of axial member stiffness of connected parts was derived. Experimental investigations of the torque-preload relationship and pressure distribution were carried out. The proposed model was applied to multi-layer flange connection structures of an aeroengine, and the hollow ellipsoid model was numerically and experimentally verified. The results show that the preload is positively cor? related with the torque,and the tightening coefficient is about 0.2, which is consistent with the empirical value of bolt tightening torque coefficient under no lubrication condition in engineering. With the increase of torque,the contact range of the connection interface increases to a certain extent and then remains unchanged. Compared with the experimental results of axial stress distribution of the con? nected parts, the maximum error of the calculation results using the improved hollow ellipsoid model and the original hollow cone model are 9.42% and 21.97%, respectively, proving the improved hollow ellipsoid distribution model has higher accuracy.
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