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Modelling heat-to-heat variability in high temperature cyclic deformation behaviour

机译:建模高温循环变形行为中的热-热变化

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摘要

In high temperature engineering design, representations of the cyclic deformation behaviour of the material of the component are required as analysis data input to determine the stress-strain state at critical locations and ultimately component lifetime. While description of the cyclic stress-strain properties for a single heat of an alloy is relatively straightforward, even using complex constitutive model formulations, the same is not necessarily true for the derivation of mean or minimum alloy property representations. A novel method has recently been developed for this purpose. The concept is demonstrated for a high temperature steel for temperatures between 22 degrees C and its maximum application temperature using the non-linear kinematic strain hardening model of Chaboche applied to the mid-life cyclic/hold data for a number of heats of the alloy.
机译:在高温工程设计中,需要表示零件材料的周期性变形行为作为分析数据输入,以确定关键位置的应力应变状态并最终确定零件寿命。尽管对合金单次加热的循环应力-应变特性的描述相对简单,即使使用复杂的本构模型公式,对于平均或最小合金特性表示的推导也不一定如此。为此已经开发了一种新颖的方法。使用Chaboche的非线性运动学应变硬化模型,将高温钢的温度在22摄氏度和其最高使用温度之间进行了论证,该模型适用于多种合金热的中寿命循环/保持数据。

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