中文摘要：

基于非线性接触理论,建立了地铁弹条Ⅲ型扣件系统有限元模型。计算了弹条扣压力与弹程之间的关系,分析了Ⅲ型弹条插入铁垫板插孔不同长度下的弹条应力,研究了铁垫板端部插孔圆角半径对扣压力和应力的影响,基于数值结果,优化了铁垫板端部插孔圆角半径。结果表明：弹条插入铁垫板插孔的长度对弹条与铁垫板插孔间的接触状态影响明显;弹条应力集中区域出现在与铁垫板端部接触的弹条后端圆弧内侧表面;将铁垫板圆角半径改为8 mm,可以明显减小该区域的应力值。

英文摘要：

Based on the nonlinear contact theory, a finite element model of spring clip-III fastening system used in metro lines is established. The relation between fastening＇ s clamping force and vertical displacement of its finger is obtained. Stress level of spring clip is analyzed under different distance of the spring clip inserting into the shoulder. The influence of radius of the shoulder end on clamping force and stress is investigated. Based on numerical results, the radius of the shoulder end is optimized. Results show that the distance of the spring clip inserting into the shoulder greatly affects the contact state between the clip and the shoulder. A local stress concentration in the clip occurs at the clip＇ s backend arc surface that is contacted with the shoulder end. When the shoulder end radius is changed to 8 mm, the stress value of the local stress concentration area significantly decreases.