【摘要】 轮轨的相互作用实际上是反复荷载作用下的接触应力问题。只有运用塑性理论的安定性分析才能找到合理的强度判据。本文在论述轮轨接触应力的Hertz弹性解后,根据Melan定理进行了安定性分析,并提出了轮轨强度设计的新判据,即(τ_xz²+τ_yz²)_max≤k²。结果表明,新判据大大地提高了根据弹性解所确定的最大轴重。算例指出,最大轴重比弹性解提高64％左右。更多还原

【Abstract】 The wheel-rail interaction, in nature, is nothing but a problem of contact stress produced in a body subjected to repeated loads. A rational strength criterion of such a problem can be found only by a shakedown analysis on the theory of plasticity. In this paper, after the introduction of Hertz’s elastic solution of the wheel-contact stress, a shakedown analysis is made according to Melan’s rule and the new criterion for the wheel-rail strength design, i.e.( τ_xz² + τ_yz²)_max≤k², proposed as well. It is shown that the maximum axial load determined by the new criterion is much larger than that by the elastic solution. Illustrative examlpes reveal the maximum axial load can be increased by 64%.更多还原