摘要
通过分析P91钢在625℃下不同应力水平下的单轴蠕变断裂的实验数据,对P91钢在625℃下的单轴蠕变实验现象应用唯象分析的方法进行数学描述,并在ANSYS有限元中的Graham蠕变模型的基础上,提出了对ANSYS有限元软件中的Graham蠕变模型进行参数上的修正,修正后的Graham蠕变模型能比较精确地描绘出金属材料单轴蠕变过程的第二、第三阶段特性,并应用该修正的Graham蠕变模型对P91钢在625℃下的不同应力水平进行了单轴蠕变过程的数值模拟,ANSYS有限元单轴蠕变模拟数据和单轴蠕变实验数据吻合较好。这说明修正的Graham蠕变模型模拟金属单轴蠕变过程的合理性,该模型可以作为ANSYS有限元软件模拟多轴蠕变过程的蠕变法则,为ANSYS有限元软件在材料非线性方面(金属材料蠕变分析)的二次开发提供了理论基础。
This paper presents a mathematical model for phenomenological analysis of metallic material uni-axial creep tests based on the analysis of experimental data obtained from the P91 steel uni-axial creep tests at 625℃ under different stress levels. It also proposes a modification on the parameters used in the Graham Creep model in the ANSYS Finite Element software package. The modified Graham Creep model can describe more accurately the characteristics in the second and third stages in the metallic material uni-axial creep process. The modified model has been applied to simulate the P91 steel uni-axial creep tests at 625℃ under different stress levels and the simulated results agree with the experimental results substantially. This convinces the validity of the modi fied model. This model can be used as a creep principle in simulating a multi-axial creep process using ANSYS Finite Element software package. This model lays a theoretical founda tion for further application development of ANSYS Finite Element software in simulating nonlinear characteristics of mate rials （Metallic Creep analysis）.
出处
《现代电力》
2006年第1期57-60,共4页
Modern Electric Power
