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A-type frame fatigue life estimation of a mining dump truck based on modal stress recovery method

机译：基于模态应力恢复方法的矿用自卸车A型框架疲劳寿命估算

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摘要

Cracks of A-type frame of a mining dump truck have occurred before exceeding structural fatigue design life. In order to accurately predict location of cracks and fatigue life of this component and find the reasons, a fatigue life analysis method combined with experiment and simulation is presented. Compared with the tested peak stress and simulated maxi mum stress of A-type frame under full loadings, the difference is acceptable so that the accuracy of finite element model of A-type frame is guaranteed. The rigid and flexible hybrid model of whole truck is built to get the stress situation based on modal stress recov ery method, taking flexible body of A-type frame into account. Compared with the tested acceleration, the vertical simulated acceleration of the seat is acceptable, which ensures the validity of rigid and flexible hybrid model of this mining dump truck. According to the linear Palmgren-Miner hypothesis and S-N curve, fatigue life of A-type frame is assessed. The results show that the predicted cracks location and fatigue life of A-type frame is well accordance with the practical situation. To extend life of A-type frame, a mod ified structure is presented in this paper.
机译：在超过结构疲劳设计寿命之前，发生了矿用自卸车的A型车架的裂缝。为了准确预测该部件的裂纹位置和疲劳寿命并找出原因，提出了一种结合实验和仿真的疲劳寿命分析方法。与A型框架在满载条件下的测试峰值应力和模拟最大应力相比，该差异是可以接受的，从而保证了A型框架的有限元模型的准确性。建立了整车的刚柔混合模型，以模态应力恢复方法为基础，考虑了A型车架的柔性体，得出了应力情况。与测试加速度相比，座椅的垂直模拟加速度是可以接受的，从而确保了该矿用自卸车的刚性和柔性混合模型的有效性。根据线性Palmgren-Miner假设和S-N曲线，评估A型框架的疲劳寿命。结果表明，预测的A型框架裂纹位置和疲劳寿命与实际情况吻合较好。为了延长A型框架的使用寿命，本文提出了一种改进的结构。

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