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�������պ����ѧѧ�� 2004, Vol. 30 Issue (08) :727-731    DOI:
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Udimet 720 Li ���±������Ե�ճ���Ա�����ģ�о�
ʯ����, ������, ������*
�������պ����ѧ ��Դ�붯������ѧԺ, ���� 100083
Visco-plastic constitutive modeling of inelastic deformation of Udimet 720 Li at high temperature
Shi Duoqi, Yang Xiaoguang, Wang Yanrong*
School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ����Chabocheͳһճ���Ա�������,��Udimet 720 Li��700��ʱ�ĵ������졢ѭ�����ؼ�������Եȸ��ӵĸ��±�����������˽�ģ�о�.̽����Chaboche�������۶���Щ����������н�ģ����ʽ,���ر���Կ��ٸ���ͬ�����ͷǶԳ�ѭ������ʱ��ƽ��Ӧ���ɳ�����,��Chaboche�������۽����������ͱ仯.������������Chaboche��������,��Levenberg-Marquadt�������Ż��㷨����,�����˲��ϲ����Ż�����,�õ��˲��ϲ���ֵ.�о�����,����������Chaboche����ģ�ͿɽϺõؽ�ģ�������ºϽ�Udimet 720 Li�ڸ����µĸ��ֱ�����Ϊ.
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Abstract�� The mechanical deformations of a Nickel-based superalloy Udimet 720 Li was modeled simultaneously by the Chaboche unified viscoplastic constitutive theory under tensile, cyclic and creep loading conditions at 700��. To describing the phenomena of cyclic relaxation of mean stress under strain controlled cyclic loading and fast isotropic softening during unloading, the equations of internal variables of the theory were modified. A program code of parameter optimization was compiled with 1-dimentional Chaboche model by Levenberg-Marquadt nonlinear algorithm. A global strategy for model parameters optimization was proposed, which produced good results. The numerical simulations showed that this modified Chaboche model has sufficient capability of modeling various mechanical behaviors under complex loading conditions.
Keywords�� viscoplasticity   constitutive equations   ratchetting   cyclic relaxation of mean stress   super-alloy   parameter optimization     
Received 2003-05-06;
Fund:

ŷ��FP5���E3E�е�JET��Ŀ(E01100302)

About author: ʯ����(1975- ),��,���ɹ��ٺ���,��ʿ��,shdq@buaa.edu.cn.
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ʯ����, ������, ������.Udimet 720 Li ���±������Ե�ճ���Ա�����ģ�о�[J]  �������պ����ѧѧ��, 2004,V30(08): 727-731
Shi Duoqi, Yang Xiaoguang, Wang Yanrong.Visco-plastic constitutive modeling of inelastic deformation of Udimet 720 Li at high temperature[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(08): 727-731
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