When the load is the stress cycle, the mechanical properties of materials caused by the deteriorationprocess is known as fatigue damage.
当荷载是循环往复应力时，引起的材料力学性能劣化过程称为疲劳损伤。
2
The structural stiffness and its deteriorationprocess, bearing capacity, ductility, energy dissipation, failure mechanism and failure feature were analysed systematically.
较系统地分析了结构的刚度及其衰减过程，以及承载力、延性、耗能、破坏机制和破坏特征等。
3
The deteriorationprocess of hydraulic oil in a high-pressure hydraulic system of cold rolling mill is studied through oil diagnosis technology, and the reason is also analyzed.