高速铁路弹条强度的试验分析与数值模拟

Numerical Simulation and Experimental Analysis of WJ-7 Projectile Strength

WJ-7型扣件弹条技术是高速铁路无砟轨道的关键技术之一,为研究弹条在实际工作时的应力分布状况和强度,首先采用MTS809电液伺服液压试验机对机械加工后的弹条进行拉伸试验,得出弹条的抗拉强度在1900 MPa左右;然后采用应变电测法测出弹条各测点在不同扣压力下等效应力值;最后使用ABAQUS有限元软件建立完整的扣件模型,对扣件弹条进行数值分析。通过试验和有限元对比得出弹条扣压力与等效应力呈线性关系且弹条后端大圆弧处是应力最大的危险部位;扣压力为30 kN时,弹条后端大圆弧处等效应力为1929.5 MPa,超过了弹条的抗拉强度。

WJ-7 fastener spring bar technology is one of the key technologies of ballastless track of high-speed railway.In order to study the stress distribution and strength of the spring bar in actual work,MTS809 electro-hydraulic servo hydraulic testing machine was used first,the elastic bar was subjected to a tensile test,and the tensile strength of the elastic bar was about 1900 MPa;then the equivalent stress value of each measuring point of the elastic bar under different buckling pressures was measured by strain electrical measurement method;finally,the ABAQUS finite element software was applied to set up the complete fastener model and the numerical analysis of the fastener spring bar was conducted.Through test and finite element comparison,it was found that the spring bar buckle pressure was linearly related to the equivalent stress and the large arc at the rear end of the spring bar was the dangerous part with the greatest stress;when the buckling pressure was 30 kN,the equivalent stress at the large arc at the rear end of the spring bar was 1929.5 MPa,exceeding the tensile strength of the spring bar.