基于递归有限元仿真的机载设备疲劳寿命预测  

Fatigue Life Prediction of Airborne Equipment Based on Recursive Finite Element Simulation

作　　者：向华平[1] 陈腾飞[1] XIANG Huaping;CHEN Tengfei(Nanjing Research Institute of Electronics Technology, Nanjing 210039, China)

机构地区：[1]南京电子技术研究所,南京210039

出　　处：《兵器装备工程学报》2021年第9期139-143,共5页Journal of Ordnance Equipment Engineering

摘　　要：为了减轻产品质量,机载设备承载结构往往设计成薄壁骨架形式。在进行有限元仿真时,受制于计算规模,网格密度无法匹配一些应力集中或者应力梯度大的部位,导致计算精度受到影响。针对该问题,采用递归思想,通过引入位移边界映射理论,以某机载过渡框为例,较为精确预测到应力集中区域的详细应力解。研究结果表明,该预测模型提升了疲劳寿命预测的置信度,且与试验结果基本吻合,具有工程应用价值。The loading structures of airborne equipment are often designed in the form of thin-walled skeleton in order to reduce the weight of the products.In the finite element simulation,subject to the calculation scale,the mesh grid density can not match some parts with high stress concentration or stress gradient,resulting in different degrees of impact on the calculation accuracy.The detailed stress solution of an airborne transition frame was predicted accurately by introducing the displacement boundary mapping theory with the idea of global local.The confidence of fatigue life prediction was improved,which is basically consistent with the test results.This method has certain application value for similar engineering problems.

关 键 词：有限元 边界映射 疲劳寿命 S-N曲线 

分 类 号：U270[机械工程—车辆工程]