CAJ | 학술논문

为准确预测某副车架疲劳寿命，对其进行三维建模与有限元分析，获得其结构应力分布，并确定副车架的疲劳损伤热点；试验场条件下测取副车架的应变载荷，通过频谱分析与低通滤波等计算副车架结构各测点的最大主应力，利用雨流计数法编制副车架载荷谱；利用局部应力应变法与Miner准则进行应力集中修正，完成副车架的疲劳寿命预估。估算得出该副车架试验场预期寿命为9120 h。
위준학예측모부차가피로수명，대기진행삼유건모여유한원분석，획득기결구응력분포，병학정부차가적피로손상열점；시험장조건하측취부차가적응변재하，통과빈보분석여저통려파등계산부차가결구각측점적최대주응력，이용우류계수법편제부차가재하보；이용국부응력응변법여Miner준칙진행응력집중수정，완성부차가적피로수명예고。고산득출해부차가시험장예기수명위9120 h。
To predict accurately fatigue life of a subframe, we build a 3D model of this subframe and make FE analysis, and get structural stress distribution and determine fatigue damage heat points. We measure the strain load of the subframe in the proving ground, and use frequency spectrum analysis and low passing filtering to calculate the maximum principal stress of the subframe. We use rain flow count method to compile the load spectrum. Using local stress-strain method and Miner standard, we revise the stress concentration, and complete fatigue life prediction of subframe. The results show that estimation life of subframe is 9210 hours.