关键词: 内开拉手；CAE 分析；失效行为；最大应力

Abstract: The purpose of the article is to optimize the strength of weak positions to improve product reliability by studying the failure behavior of the door inner handle assembly in the process of use, so as to reduce the failure rate of the aftermarket and avoid user complaints. The article analyzes the failure of the door inner handle assembly of a heavy duty vehicle door system, and with the help of six sigma quality tools, the failure is confirmed and analyzed to find out the key influencing factors affecting the failure of the door inner handle assembly. By increasing the reinforcement to improve the strength of the inner handles, the computer aided engineering (CAE) comparative analysis, before and after the improvement of the product suffered the maximum stress, the inner handles assembly own strength increased by 36%, which can effectively solve the cracking, fracture and other problems caused by the lack of strength. Meanwhile, the tracking verification of the improved product shows that the after sales failure rate is reduced by more than 25%, which is a good effect of the improvement. This study can also provide reference for the failure analysis of other related parts.

Key words: Inside opening puller; CAE analysis; Failure behavior; Maximum stresses