铸钢车轮疲劳裂纹的产生与扩展分析

发布时间：2018-01-18 05:03

本文关键词：铸钢车轮疲劳裂纹的产生与扩展分析　出处：《铸造技术》2015年12期 　论文类型：期刊论文

【摘要】：铸钢车轮运行一段时间后,在表面会产生大量的裂纹,这会影响车轮的使用寿命,因此,研究疲劳裂纹的产生与扩展具有重要意义。裂纹的产生与轮轨接触应力、加工工艺密切相关,首先用有限元理论定量分析了接触应力和塑性变形,然后借助安定图理论预测车轮疲劳产生的可能性。结果表明,在循环应力作用下,塑性变形会不断累积,材料表面产生棘轮效应,该过程会促进裂纹源的萌生。裂纹源形成后,开始进入扩展期,依据材料性能学理论,将裂纹扩展期分成两个阶段,并对每个阶段分别叙述,其中第二阶段是促进宏观裂纹形成的关键期,并影响车轮表面宏观裂纹的分布形态。
[Abstract]:Cast steel wheels run for a period of time, in the surface will produce a large number of cracks, which will affect the service life of the wheel, therefore. It is very important to study the generation and propagation of fatigue crack, which is closely related to wheel / rail contact stress and processing technology. Firstly, the contact stress and plastic deformation are quantitatively analyzed by finite element theory. The results show that under cyclic stress plastic deformation will accumulate continuously and ratchet effect will occur on the material surface. The process will promote the initiation of the crack source. After the crack source is formed, it begins to enter the propagation period. According to the theory of material properties, the crack growth period is divided into two stages, and each stage is described separately. The second stage is the key period to promote the formation of macroscopic cracks and influence the distribution of macroscopic cracks on the wheel surface.
【作者单位】：郑州铁路职业技术学院机车教研室;
【分类号】：TG260
【正文快照】： 铸钢车轮是采用铸造工艺加工而成的。以大同某公司为例,生产过程如下:原材料—金属冶炼—液体浇注—石墨成型—铸件去毛刺、飞边—毛坯热处理—切削成形—质检—下线。该工艺加工工序少,成本较低,在重载铁路系统中具有很好的应用前景。当前世界上资源丰富的国家都采用增大轴重

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