EWIS支架装配变形及其承载分析

民用飞机EWIS系统支架遍布全机,在空间狭小的区域,考虑到装配和维修的要求,需采用单侧安装工艺,若支架装配时未固定好或操作不当,会导致支架承受安装力矩载荷,使支架结构产生塑性变形和残余应力,严重的会导致支架破坏。为了分析EWIS支架在安装力矩下的应力和变形情况,采用ABAQUS对典型标准支架进行有限元分析,考虑材料的非线性特性,得到了支架在不同安装力矩下的变形和应力情况,并对塑性变形后的支架继续承载进行了分析,对比分析支架塑性变形前后承载的应力,得出了变形对承载的影响。采用非线性有限元分析方法可对支架安装力矩的作用进行模拟,并计算结构产生塑性变形后承载的应力水平,为民用飞机EWIS支架的装配过程和塑性变形后的承载分析提供参考。

Assembly plastic deformation and load capacity analysis of EWIS bracket

The Electrical Wiring Interconnection System (EWIS) and the supporting brackets are all over the whole aircraft. In the narrow space area, considering the requirements of assembly and maintenance, it is necessary to adopt one-sided installation process in which the brackets are not easy to fixed or assembled properly during wire installation. If the brackets is not fixed properly or operated improperly, it will cause the brackets to bear the installation torque load, cause the brackets structure to produce plastic deformation and residual stress, and seriously cause the structure damage. In order to analyze the stress and deformation of typical standard EWIS bracket under installation torque, the finite element analysis of typical standard brackets is carried out by ABAQUS. Considering the nonlinear performance of materials, the deformation and stress of bracket under different installation torque are obtained. The load capacity of the bracket with plastic deformation was analyzed. The stress before and after plastic deformation is compared and analyzed, and the influence of deformation on load capacity was obtained. The paper simulates the effect of installation torque of the brackets using nonlinear finite element method, and calculates the stress level bearing inertia loads after plastic deformation, which provides a reference for the assembly process of civil aircraft EWIS bracket and the bearing analysis after plastic deformation.