The fretting fatigue life under complex loads monotonously decreases with the increase of the high cycle load while the low cycle loads keep constant.
复合载荷下，低周幅值不变，增加高周载荷的幅值，微动疲劳寿命随幅值比的增加而降低。
The probability fatigue life - span of pressure vessel under the action of different cycle load is closely related to the cycle load with high stress.
承受不同循环载荷共同作用的压力容器，其概率疲劳寿命和在高应力水平上的循环载荷有着密切的关系。
Solving this problem is helpful to prolong the working cycle of the delayed coking equipment and insure treatment of low quality material in high load.
解决大瓦斯线结焦是延长焦化装置生产周期，确保高负荷加工劣质原料的关键手段之一。
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