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重型采矿设备的疲劳寿命预测十分重要。首先,对早已存在有慢性疲劳裂纹的铲矿机起动臂进行现场监测,从监测数据中归纳了吊杆的载荷范围。针对试验数据,建立吊杆的有限元模型来预测其压应力和应变。进行了8个裂纹发展速度试验,获得使用材料的疲劳特性。基于Palmgren-Miner’s累积损坏原则和裂纹发展速度的试验结果,计算出恒振幅的换算应力范围。
Fatigue life prediction for heavy mining equipment is very important. First, on-site monitoring of the shovel miner’s starting arm, which already exists chronic fatigue cracks, summarizes the load range of the boom from the monitoring data. According to the experimental data, the finite element model of boom is established to predict the compressive stress and strain. Eight crack growth rates were tested to obtain the fatigue properties of the materials used. Based on the results of the Palmgren-Miner’s cumulative damage principle and the crack growth rate, the range of converted stress for constant amplitude was calculated.