基于Norton-Bailey模型的P92钢初期蠕变过程分析

Primary Creep Process of P92 Steel Based on Norton-Bailey Model

以Norton-Bailey时间硬化模型和Kachanov损伤模型为基础,提出一种能够全面描述蠕变全寿命期蠕变变形发展的本构模型。与Norton-Bailey模型相比,该模型可以更准确地反映蠕变第一阶段的变形累积,以Kachanov损伤演化方程描述蠕变第三阶段的变化;推导模型第一阶段和第三阶段的参数确定方法;根据实验数据,确定P92钢的模型参数。将该模型嵌入到在ANSYS接口程序中,并用于高温合金钢P92的蠕变寿命计算,结果表明模型与实验数据基本吻合。

A modified creep model based on the Norton-Bailey model was proposed to be able to describe the whole creep process.Compared with Norton-Bailey model,the new model takes into account the primary creep accumulation.By introducing Kachanov damage equation,the modified creep model can describe the tertiary stage.And the method to determine creep parameters of tertiary stage has been derived.The new model was embedded into ANSYS interface program,and used for calculating the creep process of P92 steel.The simulated result shows a good agreement with the experiment data.