某型发动机机匣螺栓连接结构力学特性分析  

Analysis of Mechanical Characteristics of Bolt Connection Structure of a Certain Engine Casing

作　　者：胡良伟 刘文光[1] 曾天丁 Hu Liangwei;Liu Wenguang;Zeng Tianding

机构地区：[1]南昌航空大学航空制造工程学院,330063

出　　处：《工程机械》2020年第9期22-26,I0017,共6页Construction Machinery and Equipment

摘　　要：某型发动机机匣通常采用的连接方式是螺栓连接,螺栓连接的可靠性与稳定性对机匣力学特性有着较大影响。通过建立机匣与螺栓的有限元分析模型,研究螺栓预紧力对机匣螺栓连接结构轴向抗拉刚度的影响。结果表明:当螺栓预紧力较小时,随着预紧力逐渐增大,机匣螺栓连接结构轴向抗拉刚度也逐渐增大;当预紧力增大到一定值时,机匣螺栓连接结构轴向抗拉刚度趋于平稳;当螺栓预紧力过大时,会引起螺栓和连接表面的塑性变形,从而导致连接结构失效,降低轴向抗拉刚度。A certain type of engine casing is usually connected by bolts. The reliability and stability of bolt connection have a great influence on the mechanical characteristics of the casing. By establishing the finite element analysis model of casing and bolt, the influence of bolt preload on the axial tensile stiffness of casing bolt connection structure is studied. The results show that, when the bolt preload is small, the axial tensile stiffness of the casing bolt connection structure increases gradually with the increase of the preload;when the preload increases to a certain value, the axial tensile stiffness of the casing bolt connection structure tends to be stable;when the preload is too large, it will cause the plastic deformation of the bolt and the connection surface, which will lead to the failure of the connection structure and reduce the axial tensile stiffness.

关 键 词：螺栓连接结构 轴向抗拉刚度 螺栓预紧力 发动机 有限元 

分 类 号：V23[航空宇航科学与技术—航空宇航推进理论与工程] TH131.3[机械工程—机械制造及自动化]