边缘结构材料对透明件疲劳寿命的影响及优化

本文通过对某飞机侧风挡有机层合玻璃透明件进行增压载荷下低周疲劳试验,发现其边缘连接孔周围出现变形甚至破裂的现象。基于ABAQUS软件中隐式计算的方法对该侧风挡进行了增压载荷加载的仿真分析。建立了解析刚体模拟透明件和机身骨架之间的螺栓连接结构。计算结果中透明件的应力分布与疲劳试验中透明件边缘的破坏规律一致。选择涤纶钢作为透明件边缘的加强材料,对新结构的透明件进行了相同的低周疲劳试验。试验结果未发现其边缘孔位置出现变形及破坏,同时仿真结果显示层合透明件的最高应力水平下降了50.5%。通过仿真分析发现随着边缘粘接材料弹性模量的增加,透明件的最大等效应力降低,但变化率减小。本文结论对透明件边缘粘接材料的选择及结构的优化具有一定的指导意义。

Effects of Edge Joint Material on Fatigue Life of Transparent Parts and Optimization

Distortion and crack were found around the side window's connecting hole after the low-cycle fatigue test on the laminated glass of an aircraft's side window . The loading process of side window was simulated by ABAQUS software using implicit calculation method .The analytical rigid was built to simulate the structure connected by bolts between transparent parts and frame of aircraft .The result shown that the stress filed of transparent part was coincident with the transparence's damage tendency in fatigue test .The new structure with polyester steel bonding its edge was tested by the same low-cycle fatigue test .There was no distortion and crack around the hole of edge ,at the same time the simulation results shown that the highest stress value of laminated transparent parts decreased 50.5% . The simulation results indicate that the maximum Mises stress of transparent decreased with the increase of edge material's elastic modulus ,but the rate of change decreases .Result of this study is instructive in the aspect of edge materials' selection and structure optimization .