低压铸造A356铝合金副车架的疲劳失效分析  

Fatigue failure analysis of low astingg A356 aluminum alloy subframe

作　　者：梁帅 马焕祥 王苗 王文博 Liang Shuai;Ma Huanxiang;Wang Miao;Wang Wenbo(Ningbo Innovation Research Institute,Beihang University,Ningbo 315800,China;Ningbo Xusheng Group Co.,Ltd.,Ningbo 315806,China)

机构地区：[1]北京航空航天大学宁波创新研究院,浙江宁波315800 [2]宁波旭升集团股份有限公司,浙江宁波315806

出　　处：《汽车知识》2024年第9期132-135,共4页AUTOMOTIVE KNOWLEDGE

基　　金：宁波市北仑区关键核心技术攻关项目(项目编号:2021BLG004)。

摘　　要：本文研究低压铸造A356铝合金副车架的失效和疲劳特性,揭示了铸造缺陷对疲劳寿命的影响。研究表明,铸造过程中产生的孔隙、缩孔和夹杂物成为疲劳裂纹萌生点,导致裂纹扩展。疲劳试验显示,副车架在579831次加载后几何形状处发生裂纹。扫描电镜(SEM)和能谱分析(EDS)显示断口残留物和氧化铝夹杂,降低了力学性能。建议改进铸造工艺、减少夹杂物并优化结构设计以延长疲劳寿命。This paper investigates the failure and fatigue characteristics of low-pressure casting A356 aluminum alloy subframes,revealing the effect of casting defects on fatigue life.The study shows that the pores,shrinkage holes and inclusions generated during the casting process become fatigue crack initiation points,leading to crack extension:fatigue tests show that the subframe cracks at the geometry after 579831 loadings;scanning electron microscopy(SEM)and energy spectrum analysis(EDS)show that fracture residues and alumina inclusions degrade the mechanical properties,and it is suggested that the casting process be improved,inclusions be reduced,and the structure be optimized to extend the fatigue life.design to extend the fatigue life.

关 键 词：A356铝合金 副车架 失效分析 疲劳试验 

分 类 号：U463.324[机械工程—车辆工程]