疲劳强度计算是指，零件和构件在低于材料屈服极限的交变应力（或应变）的反复作用下，经过一定的循环次数以后，在应力集中部位萌生裂纹。裂纹在一定条件下扩展，最终突然断裂，这一失效过程称为疲劳破坏。材料在疲劳破坏前所经历的应力循环数称为疲劳寿命。
... 稳定性计算(stability calculation) 疲劳强度计算(fatigue strength calculation) 静刚度(static rigidity) ...
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同时，该方法不仅可以运用到转轮的疲劳强度分析中，也可以运用到其它部件的疲劳强度计算中。
This method not only can be used the calculations of Francis runners but also can be used the other calculations of parts.
在建立了车辆驾驶室疲劳强度计算的力学和数学模型基础上，提出了车辆驾驶室疲劳强度研究方法。
A model of calculation for vehicle cab is established. A study method for vehicle cab fatigue strength is given.
对螺纹槽管进行了疲劳强度计算，并采用边界元和有限元法对螺纹槽管的应力集中进行了数值分析及静载强度计算。
The stress concentration analysis was done by the finite element method and boundary element method. The fatigue strength and the strength under the static load were calculated.
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