航空发动机螺栓连接薄层单元建模方法  

Modeling method of bolted joints of aero-engine based on thin-layer element

作　　者：姚星宇[1] 王建军[1] 翟学[1] 

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100191

出　　处：《北京航空航天大学学报》2015年第12期2269-2279,共11页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：螺栓连接广泛应用于航空发动机结构中,对航空发动机动力特性有重要影响.薄层单元法能够很好地模拟复杂连接结构并保持结构完整性.以薄层单元法为基础,给出航空发动机螺栓连接结构薄层单元法参数化建模原理,研究薄层单元材料参数对螺栓连接刚度的影响规律,并从理论推导出发确定薄层单元相关材料参数,最后将该方法应用到实际结构中,并与精细有限元模型结果对比,从而验证薄层单元法的正确性和应用前景.研究结果表明:薄层单元法能够很好地模拟航空发动机螺栓连接结构;对轴向、弯曲刚度起决定作用的是薄层单元轴向弹性模量,对剪切刚度起决定作用的是薄层单元xy、xz平面的剪切模量;薄层单元材料参数能够用螺栓连接结构参数示出.The bolted joints,which are commonly used in aero-engine structure,have important influences on dynamic characteristics of aero-engine. The thin-layer element method can simulate complex connection structure and maintain the structure integrity. Based on the thin-layer element method,the modeling principles of aero-engine bolted joints was studied and the influence law of material parameters of thin-layer element on bolted joints stiffness was researched. Then the material parameters of thin-layer element through theoretical derivation were determined. Finally it was applied to actual structure and compared with detailed finite elements model so as to verify the correctness and aspect of this method. The results indicate that the thin-layer element method can simulate aero-engine bolted joints excellently; the axial and bending stiffness are decided by axial elastic modulus of thin-layer element,and the shear stiffness is decided by the xy and xz plane shear modulus of thin-layer element; the material parameters of thin-layer element can be expressed by structural parameters of bolted joints.

关 键 词：螺栓连接 薄层单元法 航空发动机 连接刚度 有限元 

分 类 号：V232.7[航空宇航科学与技术—航空宇航推进理论与工程]