介绍了一种预测受多轴交变载荷工程构件的低周疲劳寿命的方法。
A method is outlined for making low cycle fatigue life prediction for engineering components subject to multiaxial loading.
结果表明，扭转预应变降低低周疲劳寿命，循环应力随扭转预应变的增大而增大。
The results show that low cycle fatigue life is reduced and cyclic stress is raised by torsional prestrain raising.
提出了一个用于计算非对称循环载荷下材料低周疲劳寿命的累积损伤模型和方法。
In this paper, a method of computation for the low-cyclic fatigue life under the action of asymmetrical cyclic load is proposed.
在详细分析试验和有限元计算结果的基础上，提出了复杂应力状态下的低周疲劳寿命模型。
Based on experimental data and finite element analysis results, a low-cycle fatigue life model is proposed for the powder metallurgy superalloys under multiaxial stress states.
本文对预测高温低周疲劳寿命的FMDF公式作了改进，结果明显提高了精度，使其方便实用。
This paper presents a modification to the FMDF model for predicting high-temperature low-cycle fatigue life, which improves accuracy of the model and facilitates the application of it.
记录了各自的循环应力—应变滞后环，得出了试样的循环响应特征和各试样的高温低周疲劳寿命。
The individual cycle-strain hysteresis loops were recorded, and the cycling response and high temperature low cycle fatigue life were obtained.
提出了汽轮机主汽阀和调节阀阀壳低周疲劳寿命和蠕变寿命的定量设计方法，并给出了应用实例。
The paper also presents the low cycle fatigue life and creep life's quantificational method of steam turbine's main stop valve and control valve, and applied examples.
高温低周疲劳(HLF)寿命预测方法对于承受变幅载荷的高温构件的设计具有重要意义。
High temperature low cycle fatigue (HLF) life prediction models have great significance for design of high temperature structure under cycLic loading.
低周疲劳常采用寿命分散系数描述结构疲劳强度的固有分散性，而高周疲劳采用疲劳强度减缩系数来描述。
The factor of life scatter is used for depicting the dispersibility of fatigue strength in low cycle fatigue, but in high cycle fatigue is the fatigue strength reduction factor.
结果表明：与纯低周载荷作用相比，高低周复合载荷下球墨铸铁的裂纹扩展速率明显加快，极大地降低材料的疲劳寿命。
The results show that the crack growth rate under high-low cycle complex fatigue load is greater than that under low cycle fatigue load, and so the fatigue life is obviously reduced.
引入了概率循环应变—寿命曲线描述低周疲劳循环应变—寿命试验数据的分散性。
To model the random cyclic strain life relations during low cycle fatigue, probability based cyclic strain life curves are suggested.
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 fretting fatigue life under complex loads monotonously decreases with the increase of the high cycle load while the low cycle loads keep constant.
本文对45号钢在静载荷下与在循环加载下的本构关系进行了探讨，并给出了低周与高周应变循环的疲劳寿命表达式。
The 45 steel natural relation of dead load with cyclic load and low frequency and high frequency strain cycling fatigue life are studied.
在低周塑性疲劳阶段构件的疲劳开裂寿命仍可提高1倍左右。
In the low cycle plastic fatigue period, the fatigue progress life Nfcan al - so be increased by 1 time.
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.
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.
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