Research of creep test at room temperature of the impact of the creep on loss in the toe load of WJ-7 ballastless track fastener

摘要

In order to investigate the room temperature influence of creep on ballastless track fastening bucklepressure loss, the research on the impact of the creep on loss in the toe load of WJ-7 ballastlesstrack was carried out in the study. Respective tests were carried out for two groups of fasteners(five sets of fasteners for each) with unchanged deformation of fasteners and unchanged initialtoe load of fastening, embedded with the pressure sensor and stress sensor in the positionscorresponding to the assembled fasteners to measure the tow load of fastening. Under thecircumstance that certain buckle load was kept, the changes in displacement of T bolts and Tnuts were used to indicate the creep deformation of the elastic bar, and the creep rule of thefastener and its impact on the tow load of fastening under two circumstances were comparedand analysed.