Experimental Study on Impact Force Behaviors Subjected to Ice-Block Detached from High-Speed Train
As the ice-block detached from a high-speed train has a large mass and high speed, the great impact may cause damage to the track structure. It is the premise and foundation of track damage re-search to investigate the impact force behaviors subjected by the ice-block. The impact force history of a cylindrical ice-block projected by a light-gas gun was directly recorded through an annular force measure-ment transducer during an impact event, and the influence of impact velocity on impact force behaviors was analyzed. The impacting fragmentation characteristics of the ice were observed by a high-speed video during the impact event. The experimental results demonstrated that under the same projection pres-sure, the same impact force histories were obtained. The maximum deviation of the impact velocity, the peak forces, and their corresponding times are less than 7.6％, which indicated the impact force experi-mental system is reliable and stable. The impact force curves, the failure mode, and the fragmentation characteristics of the ice-block at the speed of 150 km/h to 350 km/h are all basically the same. With the increase of the impact velocity, the impact time becomes short, while the peak force and the total im-pulse increase linearly. The initial landing time has little change, fluctuating within 32～40μs. The peak force increases linearly with the increase of kinetic energy and total impulse of the ice-block, and the maximum linearity deviation is basically within 10％.
万方数据
维普
