The combination structure and the circuitry board are extracted from the equipment to make impact vibration and sweep vibration experiment,and the damage laws of electro-product in vibration environment are analysed in this paper.

To simulate the effect of the defect on performance of steel structure, damage evolution law of weld metal must be predefined.

Through the studies to anti-freezing critical strength of subzero high strength pumped concrete, we deduced the freeze-damage law of early age, and, through studies to submicro-construction of damaged concrete, we found the parameters of pore at submicro-construction can reflect the damage status of the concrete effectively.

The measurement of the high-cycle fatigue damage variable and the study of the damage evolutional law;