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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.1; 20051026-28; Nanjing(CN) >Research on Forecasting Fatigue Life of the Axial Suspending Tube on Locomotive under the Random Stress Spectrum
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Research on Forecasting Fatigue Life of the Axial Suspending Tube on Locomotive under the Random Stress Spectrum

机译：随机应力谱预测机车轴向悬架疲劳寿命的研究

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摘要

Aiming at the phenomenon that there are fatigue cracks on the cast-steel Axial Suspending Tube on Locomotive, and in order to find out the reasons that caused these cracks, forecast its fatigue life and determine the repair cycle, in this paper, the cracks has been investigated. The fatigue crack's length of the Axial Suspending Tube obeys normal distribution. Finite Element Analysis of the Axial Suspending Tube has been done under limited load cases. The result shows that the position that had the maximum stress is the same position where the crack appeared. Spot testing between Xi-an and Zheng-zhou got the stress spectrum. The fatigue life was got by local stress-strain method and fracture mechanics method. This fatigue life has been compared with the other one got by nominal stress method, and these two fatigue lives are accordant. The comparison between the crack's initiation life got by local stress-strain method and actual data shows that the fatigue strength coefficiency caused by casting defects, which was assumed in this paper, is reasonable, and the local stress-strain method is a reasonable method to get the fatigue crack initiation life. An improved model was assumed, the comparison shows the great casting defect is the most important reason for the cracks. The fatigue life got in this paper provides the reliable basis for determining the repair cycle.
机译：针对机车铸钢轴向悬挂管上出现疲劳裂纹的现象，找出引起裂纹的原因，预测其疲劳寿命，确定维修周期，本文对裂纹进行了研究。被调查。轴向悬挂管的疲劳裂纹长度服从正态分布。轴向悬挂管的有限元分析已经在有限的载荷情况下进行了。结果表明，应力最大的位置与裂纹出现的位置相同。西安和郑州之间的现场测试得到了应力谱。疲劳寿命通过局部应力应变法和断裂力学法求得。将该疲劳寿命与通过标称应力法获得的另一疲劳寿命进行了比较，并且这两个疲劳寿命是一致的。通过局部应力应变法得到的裂纹萌生寿命与实际数据的比较表明，本文假设的铸造缺陷引起的疲劳强度系数是合理的，局部应力应变法是一种合理的方法。获得疲劳裂纹萌生寿命。假设模型是改进的，比较结果表明巨大的铸造缺陷是产生裂纹的最重要原因。本文得出的疲劳寿命为确定维修周期提供了可靠的依据。

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