针对某型3．5 t叉车货叉疲劳断裂问题，在建立货叉有限元模型基础上，运用形状优化法对货叉进行结构优化，使货叉在质量没有增加的情况下，最大应力降低了18．86%.再以静态分析结果为基础，以VDI (德国工程师协会)循环实测的载荷谱为依据，基于Miner疲劳理论，对优化前后的货叉有限元模型进行疲劳模拟分析，优化后的货叉寿命是优化前的1．93倍，疲劳试验结果满足企业要求.%Shape optimization was carried to a certain type of 3. 5 t forklift fork based on a finite element model in order to improve its fatigue fracture. The optimization reduced 18. 86% of the maximum stress of the fork without increase of weight. Based on this static analysis, a fatigue simulation analysis was then conducted to the un-optimized and optimized forks under Miner’s Rule according to the load spectrum measured by the Association of German Engineers ( VDI) . Fatigue tests have proved that the fatigue life of the optimized fork is 1. 93 times that of the un-optimized one, meeting the needs of the industry.
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