某车型举升门内外板开裂问题解决策略

Resolution Strategy on Inner/Outer Crack of Liftgate in Automobile System

针对我公司某车型在整车可靠性耐久试验中出现的举升门内外板开裂问题,在Hypermesh、Nastran等平台下对开裂区域进行了CAE分析和结构设计分析,发现尾门内外板应力集中和窗框加强板结构设计不合理,导致举升门内外板所受应力超过了材料本身屈服强度,从而成为开裂的主要原因。通过窗框加强板形状的规整和焊点数量的增加,使得道路试验总里程远远超过坏路里程,不仅通过了道路试验,还节约了10%以上的成本,为公司带来了经济效益。

Focusing on the inner/outer crack trouble of liftgate from reliability endurance test for an automobile system of our company,CAE analysis and structural design are performed for the crack area under Hypermesh and Nastran platforms.It is discovered that,stress concentration on inner/outer plate of taildoor,and inappropriate structural design on reinforcing plate of window frame,are two factors causing a larger stress on inner/outer plate of liftgate than yield strength of material itself,becoming a main reason of cracking.Through regularization on shape of reinforcing plate of window frame,and increase of weld spot number,total mileage in the road test is greater than bad road mileage,which not only passes the road test,but also saves cost of 10%or more,bringing economic benefits to our company.