校车车身悬置横梁强化路耐久性断裂试验研究  

Experimental Study on Durability Fracture Behavior of Mounting Crossbeam for School Bus Body Based on Enhancement Roads

作　　者：门玉琢[1] 于海波 石利敏 

机构地区：[1]长春工程学院机电工程学院,吉林长春130012 [2]中国第一汽车股份有限公司技术中心,吉林长春130011

出　　处：《机械设计与制造》2014年第7期49-51,共3页Machinery Design & Manufacture

基　　金：国家自然科学基金(51378075);吉林省科技发展计划资助项目(201201135);吉林省教育厅春苗计划项目(2013299);吉林省高校新世纪科学技术优秀人才项目

摘　　要：为研究某型校车试验场强化路与山区公路可靠性试验阶段出现的车身悬置横梁断裂问题,采集并对比横梁的相对应位置与断裂横梁裂纹附近的应变载荷谱,应用Neuber法则和循环应力-应变滞回环曲线方程,将名义应变历程转换为断裂部位的局部应力-应变响应,根据Manson-Coffin模型修正平均应力对疲劳损伤的影响,并利用INFIELD和LMSTecWare软件计算相对疲劳损伤。计算结果表明,强化路中比利时路的疲劳损伤比例超过70%,是产生裂纹的主要工况,横梁因高应力集中而产生较大应变和疲劳损伤发生振动疲劳断裂,研究结果为横梁的结构改进提供了指导依据。In order to study the fracture problem of school bus body mounting crossbeam breakage occurring in the phase of proving ground enhancement road and mountain road reliability test, the strain loading spectrum of the contrast crossbeam corresponding position and near the broken crossbeam cracks was collected. Neuber rule and cyclic stress-strain hysteresis loop curve equation were used to convert the nominal strain history into the local stress-strain response. In accordance with the impact of Manson-Coffin model modification of mean stress on fatigue damage calculation, INFIELD and LMS-TecWare software was used to calculate the relative fatigue damage. The calculation results indicated that the proportion of fatigue damage on enhancement road exceeded 70%, which was the major cause of cracks, leading to resonance and making the crossbeam subjected to great strain and fatigue damage and then vibration fatigue fracture due to high stress concentration.

关 键 词：可靠性 载荷谱 疲劳损伤 屈服极限 

分 类 号：TH16[机械工程—机械制造及自动化]