When the load is the stress cycle, the mechanical properties of materials caused by the deterioration process 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。
The structural stiffness and its deterioration process, 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。
The deterioration process 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.
通过油液诊断技术对某大型冷轧轧机高压液压系统液压油的劣化过程进行研究，并分析该液压系统液压油迅速劣化的根源。
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