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A型弹性垫板应用于无砟轨道限位凸台的垂直面上,要求具有一定刚度和弹性,在潮湿、碱性、-20℃~40℃环境下经久耐用,不吸水,耐磨;在列车通过时频繁承受道床板动态间歇冲击载荷和收缩应力的综合作用下弹性不变化,静态压力下收缩量满足设计要求。A型弹性垫板除应达到基本的力学性能外,最重要的性能指标为静态压缩量,即胶料的恒定压缩永久变形。根据作者试验积累,可用胶料的拉断永久变形表征橡胶材料的恒定压缩永久变形,反应了橡胶垫板在受到周期应力作用下的回弹性,缩短试验周期。当拉断永久变形值小于20%时,可基本满
A type of elastic pad used in the ballastless rail limit boss on the vertical surface, requires a certain stiffness and flexibility in the humid, alkaline, -20 ℃ ~ 40 ℃ environment durable, non-absorbent, wear-resistant; in Under the combined effect of dynamic intermittent impact load and shrinkage stress of track bed, the elasticity does not change and the shrinkage under static pressure meets the design requirements. In addition to meeting basic mechanical properties, the most important performance measure for Type A is the static compression, which is the constant compression set of the compound. According to the author’s experiment accumulation, the permanent set deformation of the rubber material can be characterized by the permanent deformation of the rubber material, which reflects the resilience of the rubber plate under cyclic stress and shortens the test period. When the pull off the permanent deformation value is less than 20%, can be almost full