薄壁构件的高温低周疲劳寿命的预测与验证

High Temperature Low Cycle Fatigue Life Prediction and Verification of Thin Wall Components

提出了文题的计算模型,它采用非线性弹塑性蠕变有限元法,计算构件危险点在高温及周期保载的交变载荷谱作用下的应力应变响应,以应变范围区分法累积损伤,从而求出构件的疲劳寿命,并以带孔矩形薄板为例作了计算与验证,结果吻合较好,可供工程应用。

A computed model of this title is presented. The non-linear finite element method for analysis of elastic-plastic-creep problem is used to calculate the stress strain response of critical region point of component undergoing external alternating load with period hold loading histories and high temperature. By using the strain range partitioning method the degree of damage is cumulated and the fatigue life is calculated. For better explanation, an example is introduced. The title of a rectangular thin plate with a small hole is completed and from comparison, the results between them are reasonably good. So that, it can be used for engineering purpose.