Depending on the FEM model of wheel load drop,the dynamic responses are simulated and calculated for different railway structures impacted by a falling wheel-set,and the track\'s vibration isolation performance is compared among the common solid bed track,the low vibration track(LVT) and the floating slab track(FST).

A 3-D FE model was established in order to investigate dynamic responses of the round PCB and find the weakness of solder joint in packaging under drop impact.

With increase in electronic package density,the reliability of a board-level package under drop impact load becomes a key issue.

Drop direction is an important parameter of drop impact,this paper presented a new method to measure drop direction and introduced the basic structure,measurement circuit and principle of the sensor.

This paper began with an experiment of drop hammer impact crushing on glass balls by using drop hammer test installation.

The hi-Cr white cast iron for working under the severe repetitive-impact abrasion condition should be heat treated to obtain martensitic matrix with only few of residual austenite, that would increase its impact-spalling resistance.

An analysis is made on the cracks formed on the grinding mill cylinders and the fatigue failure is considered to be a main cause and also, the falling impact of some big blocks will somehow damage the grinding mill cylinders.