用循环计数法求出载荷及应力幅频率分布，用概率密度函数拟合，为疲劳设计提供可靠性高的数据资。
The loads and the distribution of stress amplitude frequency are obtained by cycle count and reliable data for fatigue design are provided by probability density function fit.
校核了主轴在循环载荷下的疲劳强度，为主轴的失效分析和优化设计提供了可靠的理论依据。
After checking the spindle's fatigue strength which suffered from a circulating load, it can provide reliable theoretical basis for failure analyzing and optimization designing of the spindle.
通过对广泛应用于机械设计中的非对称循环下构件疲劳强度条件的分析，提出了存在的问题。
Through analysis and calculation of the fatigue strength condition of component parts this paper discovers the erratam and analyses the reason.
在高低周复合疲劳研究中采用了正交试验设计的方法，并以此为基础综合研究了低周应力、高低周应力比、高周循环次数和高周循环频率对复合疲劳寿命的影响及其机理。
Based on the orthogonal test design, this paper studied the effect of low cycle stress, high-low cycle stress ratio , high cycle number and high cycle frequency on complex fatigue life.
提出铝合金光试样非对称循环疲劳极限的估算公式。该公式可供疲劳设计使用。
The estimating formulae of nonsymmetry cycle fatigue limits for aluminium alloy smooth specimens are presented in this paper. The estimating formulae can be used for fatigue design.
由于扭杆受到的是循环应力，因此设计时考虑了疲劳失效问题；
The fatigue failure has been considered as torsion bar spring are subject to periodic forces.
设计了涡轮盘低循环疲劳试验件，在旋转试验器上进行了涡轮盘的高温低循环疲劳试验。
An experimental turbine disk was designed, and the high temperature LCF test of the rotor was carried out on the spin test rig.
设计了涡轮盘低循环疲劳试验件，在旋转试验器上进行了涡轮盘的高温低循环疲劳试验。
An experimental turbine disk was designed, and the high temperature LCF test of the rotor was carried out on the spin test rig.
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