Studying the cracking reason of the air-condition pipe bracket of a light passenger vehicle during the durability test by establishing the Finite Element,and the modal analysis,inertial acceleration analysis and concentrated load analysis are carried out respectively.The analysis results show that the maximum stress of bracket exceeds the yield strength of material,and the stress concentration position is consistent with the initial cracking position of bracket under the concentrated load condition,which proves that this condition is the main reason for the cracking of bracket.By improving the structure,the maximum stress of bracket is reduced by 37.1%compared with before improvement,and finally successfully passed the vehicle durability test assessment.
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