摘要
为了研究弹条材质对扣件性能参数的影响,采用双线性随动强化模型,分段线性近似描述弹条材质的应力-应变关系,对SKL14弹条的扣压力-位移特性曲线进行了仿真计算,并分析不同材质对弹条性能参数的影响。研究结果表明:弹条的最大应力出现在弹条与轨距挡板接触的小圆弧处,主要表现为扭转和弯曲变形。采用38Si7材质的弹条在13mm位移的标准工作状态下,最大应力为1160MPa,已接近弹条的容许应力,尽管满足使用要求,但强度富余量不大;若采用60Si2MnA材质的弹条,则强度富余量增加7.93%,扣压力增加4.87%,残余变形值减小31.45%,建议WT扣件弹条材质可考虑采用60Si2MnA。
In order to study the material effect on performance parameters of fastening, the stress-strain relations of the clip＇s material described in the piecewise linear approximation way with Bilinear Kinematic Hardening Model, the clamping force-displacement characteristic curve of clip SKL14 is calculated and the effect of different material on performance parameters of clip is analyzed in this paper. The research result shows the maximum stress of clip SKL14 occurs with torsion and bending deformation at the small arc where the clip contacts with the gauge baffle. The maximum stress of clip 38Si7 is 1 160 MPa under the standard working condition with 13mm displacement, close to the allowable stress, which meets the operating requirement but hardly has redundant strength; if the clip is made of 60Si2MnA material, the redundant strength increases by 7.93 % , the clamping force increases by 4. 87 % , and residual deformation decreases by 31.45%. From above research, It is suggested to use 60Si2MnA for WT fastening clip.
出处
《高速铁路技术》
2012年第4期15-18,共4页
High Speed Railway Technology
关键词
弹条
扣压力
位移
残余变形
clip
clamping force
displacement
residual deformation
