Strain range

The thermal fatigue liveswere evaluated by the methods of equivalent strain range and equivalent plastic strain energy density.

利用带缺口试件进行了同相和异相热疲劳试验，并借助轴对称热疲劳力学行为的有限元数值分析程序，计算和分析了缺口处的复杂应力和应变，探讨用当量应变范围和当量塑性应变能密度评价热疲劳寿命的可能性。

The experiments confirm that the equivalent strain range from Mises equivalent theory is related with the life as Manson Coffin formula.

采用Ｍｉｓｅｓ当量准则，求出当量应变范围，通过实验证实，它与寿命之间存在着ＭａｎｓｏｎＣｏｆｆｉｎ公式关系，并把这一表达式推广到复杂应力状态且摆脱结构形状和尺寸的影响，从而可把实验室中利用试件进行的一维状态下疲劳特性的试验结果用于复杂应力状态下不同形状和尺寸的构件。

25Cr1Mo steel, the high temperature low cycle fatigue life was evaluated by the criterions of equivalent strain range, equivalent plastic strain energy and equivalent gross energy.

2 5Cr1Mo钢材料圆柱形试件的高温低周疲劳行为的研究 ,用当量应变范围准则、当量塑性应变能准则和当量总应变能准则评价多维应力状态下的高温低周疲劳寿命。

The influence of phase on thermal mechanical fatigue life is discussed by comparing with three different kinds of the phenomenological descriptions of the life curves which are expressed in terms of mechanical strain range Δεm, total strain range Δεt and inelastical strain range Δεin respectively.

通过比较热机械疲劳寿命的３种不同唯象描述方法，讨论了相位差对疲劳寿命的影响，提出对疲劳寿命的唯象描述应采用总应变范围Δεｔ或非弹性应变范围Δεｉｎ，才符合工况模拟试验和疲劳寿命预测的基本条件。

According to the character that for the high strength,low ductility alloys,the inelastic strains is small and difficult to determine,a modified method of Strain Range Partitioning (SRP) was presented.

用Rene'95材料650℃下控制应变的循环松弛试验数据对修正方法进行了验证,结果表明:对Rene'95材料的蠕变疲劳寿命,修正方法的预测能力好于应变范围区分法(SRP),对基本试验的寿命预测精度基本上在2倍范围之内。