螺纹道钉抗拔力对再生塑性复合轨枕的影响分析

再生塑性复合轨枕是一种新型材料轨枕。为研究螺纹道钉上拔力对轨枕的影响,通过轨枕材料轴向拉伸试验数据得到轨枕材料真实应力应变曲线,道钉使用木枕用螺纹道钉。假设轨枕各向同性,应变与速率无关,道钉与轨枕接触良好,建立螺纹道钉与轨枕1/4有限元模型。由钢轨在横向作用力下的转动计算出上拔力,对道钉施加上拔力,分析在螺纹道钉抗拔过程中轨枕的位移与应力应变状态。结果表明:上拔力将影响整个轨枕宽度范围,螺栓底部以及螺纹端部与轨枕接触区域应力较大,也最容易产生塑性区域;加大上拔力会在螺纹端部形成塑性区域带最终导致破坏。

The Effect of the Screw Spike Anti-pullout Force on Recycled Plastic Composite Crosstie

Recycled plastic composite crosstie is a new type of crosstie. This paper aims to analyze the effect of screw spike pullout force on the crosstie and obtain the true stress and strain curve line based on the axial tension experiment data. The screw spike applicable to wood crosstie is used. The composite crosstie is assumed to be isotropic and rate independent and in good contact with the spike,and quarter finite element models of screw spike and crosstie are established. The pullout force is calculated in terms of the rotation of the rail under lateral force,and the force on the top of screw spike is applied to analyze the crosstie displacement,the stress and strain during the process of pulling screw spike out of the crosstie. The results show that the pullout force has an effect on the whole width of the crosstie. The stresses of crosstie elements which are close to the screw spike bottom and threads are comparatively larger,and these regions are prone to failure at the same time. Increasing the pullout force may lead to a plastic region at the end of the screw and result in failure.