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Numerical analysis of toroidal voids as stress relievers in shrink-fitted shafts

机译：环形空隙作为收缩轴压力遥控器的数值分析

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摘要

High stress concentrations, slip and wear appear in shrink-fitted shafts near the contact edge in operational conditions. Due to these high stresses, and time fluctuation nature of the loads supported by shafts, cracks rapidly initiate at this surface location. This combination of events is known as fretting fatigue, which is a damage phenomenon produced in many mechanical joints. Several solutions to increase fretting fatigue life are found in practice, they include the introduction of compressive residual stresses or the reduction of stresses through a geometry modification, e.g., a slot in the shaft outside of the contact, an increase of the shaft's diameter in the contact zone, etc. This paper suggests a new geometry modification based on an increasingly popular technique that allows the manufacturing of pieces of difficult shapes, and nearly impossible to make with other techniques: additive manufacturing (AM). The idea is to introduce an internal void in the shaft, with a toroidal shape and beneath the contact edge. This feature makes the void surrounding zone more flexible, thus, reducing the contact stress field near the contact edge zone. Several geometrical configurations are numerically studied, concluding that, there is an optimal position of the void that produces, in terms of a multiaxial fatigue parameter, a significant decrease of the fatigue damage on the interest zone.
机译：高应力浓度，滑移和磨损出现在接触边缘的收缩轴上，在操作条件下。由于这些高应力，并且由轴支撑的负载的时间波动性质，裂缝在该表面位置迅速引发。这种事件的组合被称为烦恼疲劳，这是许多机械接头产生的损坏现象。在实践中发现了几种提高疲劳寿命的解决方案，包括通过几何修改引入压缩残余应力或应力的减小，例如，轴外的轴中的槽，轴的直径增加联系区等。本文提出了一种基于越来越流行的技术的新型几何修改，允许制造困难的形状，几乎不可能用其他技术制造：添加剂制造（AM）。该想法是在轴中引入内部空隙，环形形状和接触边缘下方。该特征使空隙周围区域更加柔韧，从而减小接触边缘附近的接触应力场。在数值上进行了几种几何配置，结论是，就多轴疲劳参数而言，空隙的最佳位置是在兴趣区对疲劳损伤的显着降低。

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