以Vossloh300-1型扣件系统中的ω型SKL15弹条为研究对象，采用有限元软件建立扣件系统仿真模型，在3种材料属性（线弹性模型、双线性模型、拉伸试验获取的弹塑性模型）和2种接触属性（绑定约束、非线性接触）下对弹条的力学行为进行模拟，通过疲劳试验验证模型的有效性，并研究了弹条材料属性以及弹条与嵌入块的接触属性对弹条非线性力学行为的影响。结果表明：在弹条与嵌入块的接触属性为非线性接触以及弹条本构模型为弹塑性模型的条件下，采用有限元模拟得到的弹条跟端最大主应变方向及最大主应变与试验结果相吻合，二者的相对误差分别为5%和3.4%，有限元模型有效。采用非线性接触以及弹塑性本构模型定义弹条材料得出的弹条力学行为与实际情况较接近。

Taking ω-type SKL15 spring clip in Vossloh300-1 rail fastening system as research object, the rail fastening system model was established by finite element software, and the mechanical behaviors of the spring clip were simulated under the conditions of three material properties (linear elastic model, bilinear model and elastic-plastic model obtained by tensile tests) and two contact properties (binding constraint and nonlinear contact). The validity of the models was verified by fatigue tests, and the influence of the material properties of the clip and the contact properties between the spring clip and embedded block on the nonlinear mechanical behavior of the spring clip was studied. The results show that when the contact relationship between the spring clip and the embedded block was nonlinear and the constitutive model of the spring clip was elastic-plastic model, the maximum principal strain direction and the maximum principal strain at the heel of the spring clip obtained by finite element simulation were consistent with the test results; the relative errors of them were 5% and 3.4%, respectively, which verified the validity of the finite element model. The mechanical behaviors of the spring clip obtained by defining spring clip material with nonlinear contact and the elastic-plastic constitutive model were close to the actual condition.