摘要
针对定向凝固镍基合金制造的航空发动机涡轮叶片,从涡轮叶片典型部位取材并设计制造模拟试件,在980℃下不同应力水平下进行单轴蠕变试验。对试验数据进行了唯象学的数学描述,并对ANSYS有限元分析软件中Graham蠕变模型进行了修正,使修正后的模型能够比较精确地描述单轴蠕变的全过程。并应用修正Graham模型对试验过程进行数值模拟,研究表明ANSYS有限元模拟蠕变的结果和试验数据吻合较好。这说明了修正Graham模型模拟单轴蠕变过程的合理性,该模型在一定程度上为ANSYS在金属材料蠕变分析方面的二次开发提供了理论基础。
The directionally solidified nickel-based alloy is widely used for the turbine blade of aeroengine recently.The uniaxial creep experiments have been performed at 980℃ under different stress levels on the model specimens cut from the typical part of the turbine blades.In this paper,a mathematical model is presented for phenomenological analysis of experimental data obtained from creep tests and a modification is also proposed on the original Graham creep model in the ANSYS FEA(finite element analysis) software package.The modified model can describe accurately the characteristics in the entire uniaxial creep process and it has been applied to simulate the model specimen uniaxial creep tests at 980℃ under different stress levels.The numerical simulation results are consistent with the experimental data,which proves the validity of the modified model.This model is the basis for further application of ANSYS software in metallic creep analysis to a certain extent.
出处
《应用力学学报》
CAS
CSCD
北大核心
2010年第4期772-777,共6页
Chinese Journal of Applied Mechanics
