摘要
针对某电动出租车扭力梁总成开裂失效问题进行了材料性能、焊接性能和结构应力系统性的原因分析。分析结果表明,焊接内应力和侧向工况外应力共同叠加导致扭力梁总成疲劳开裂;通过扭力梁加强板结构优化,侧向工况裂纹源处近加强板和横梁本体位置处的外应力集中分别降低了29.4%和17.3%,实现了开裂处内应力和外应力叠加后总应力的降低,最终完成了改进方案总成试制并通过了试验验证;在底盘结构件工程设计阶段,应充分利用CAE技术驱动结构优化设计,从而实现外应力和内应力降低;相比降低内应力,降低外应力通常具有较好的费效比。
Aiming at the crack failure problem of the torsion beam assembly of an electric taxi,a systematic cause analysis of material properties,welding performance and structural stress was conducted.The analysis results show that the joint superposition of welding internal stress and lateral external stress causes fatigue cracking occurred;the external stress concentration at the crack source near the stiffener and the beam body under the lateral working condition decreased by 29.4%and 17.3%respectively,which realized the reduction of the total superimposed stress of the internal stress and the external stress at the crack,and finally the overall improvement plan in the engineering design stage of chassis structural parts was completed;CAE technology should be fully used to drive structural optimization design,so as to reduce external stress and internal stress;compared with reducing internal stress,reducing external stress usually has more cost-effectiveness ratio.
作者
李欢
刘宁
余振龙
LI Huan;LIU Ning;YU Zhenlong(FAW Car Co.,Ltd.,Changchun 130012,China;Academy for Electromechanical,Changchun Polytechnic,Changchun 130022,China)
出处
《现代制造工程》
CSCD
北大核心
2023年第5期45-50,共6页
Modern Manufacturing Engineering
基金
2021年度吉林省高教科研重点课题项目(JGJX2021B32)
2022年度吉林省职业教育与成人教育教学改革研究课题项目(2022ZCY309)
2022年度吉林省教育厅产业化培育项目(JJKH20221362CY)
长春市科技发展计划项目(21ST07)
长春职业技术学院教师科技创新团队项目(02-1-1-JD016)。
关键词
扭力梁
疲劳开裂
焊接内应力
外应力
torsion beam
fatigue cracking
welding internal stress
external stress
