基于有限元法的飞机蒙皮裂纹加强补片优化设计

胶接增强修复补片的可设计性是胶接技术的优点之一，科学设计飞机结构损伤部位的增强补片是保证修补效果的重要因素。本文利用 ANSYS 软件对飞机2024蒙皮裂纹复合材料增强补片进行三维有限元建模与仿真计算，计算了复合材料单级补片和多级补片边缘胶层最大剪应力，给出了飞机2024蒙皮裂纹单侧修补时的补片优化设计参数。计算表明，用复合材料增强修补铝合金蒙皮裂纹时，补片应设计成多级形式；当补片级数超过5级时，补片边缘的胶层剪应力显著减小，与单级补片相比，其最大剪应力下降了85%。

Optimization Design of Enhanced Patch for Aircraft Skin Crack based on Finite Element Method

Flexible design pattern is an advantage for bonded repair,it is an important factor to optimize the enhanced patch pattern to ensure the durability of the repaired structure.In the paper,a 3D finite element analysis model of 2024-skin crack with composite patch was created and simulated ,the max shearing stress of single and multiple patch at edge was cal-culated,the optimized factor of one side repair of 2024-skin crack were listed.Through calculating,the enhanced patch should be designed to multiple shapes when the crack of aluminum alloy skin was repaired by composite material.The shear-ing stress at the patch edge was reduced obviously when patch series was more then grade 5,and its max shearing stress was reduced 85% compare with single patch.