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�������պ����ѧѧ�� 2003, Vol. 29 Issue (7) :627-630    DOI:
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Udimet 720 Li����B-P��ճ���Ա�����ģ�о�
ʯ����, ������, ������, ������*
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B-P viscoplastic constitutive modeling of Udimet 720 Li
Shi Duoqi, Yang Xiaoguang, Wang Yanrong, Zhou Yanpei*
School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ��Ժ��շ������������̲���Udimet 720 Li,���ݸ��µ���ʵ����,�����ڸ����غ������µ���ѧ��Ϊ,��չ�˲���Bodner-Partom(B-P)ͳһ�͵�-ճ���Ա������̽��н�ģ���о�.��������˻����ڱ������۵ĸ��ͱ���ģ�Ͷ���������졢ѭ��Ӳ����������ѧ��Ϊͬʱ���н�ģ������;���ݶ�ģ�͵ı�������,������һ�ַ�������忼�ǵ�ģ�Ͳ����Ż�����.ͨ��ABAQUS�û��ӳ���,�Ѹ�ģ�ͽ�Ͻ�������Ԫ����,�������˼�����֤.�о�����B-P����ģ�ͿɽϺõؽ�ģ���������Ͻ�Udimet 720 Li�ĸ�����ѧ��Ϊ.
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Abstract�� Udimet 720 Li is a Ni-based superalloy used for aeroengine disc. Based on the uniaxial tensile, cyclic loading and creep experiments results at 650��, the Bodner-Partom unified viscoplastic constitutive theory was applied to model the mechanical behaviors of the material under three different loading conditions. After detailed analysis of constitutive characteristics of B-P model, a global optimized strategy for model parameters was given in order to simulate tensile, cyclic and creep curves simultaneously. The B-P model was implemented in ABAQUS soft ware through UMAT subroutine using a self-adaptive time stepping strategy. The results shows that B-P model is able to describe such kinds of mechanical behaviors, but it needs to be modified to model fast isotropic softening and ratchetting.
Keywords�� viscoplasticity   constitutive relation   superalloy     
Received 2002-05-20;

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About author: ʯ����(1975-),��,���ɹ��ٺ���,��ʿ��, stonechy@163.com.
ʯ����, ������, ������, ������.Udimet 720 Li����B-P��ճ���Ա�����ģ�о�[J]  �������պ����ѧѧ��, 2003,V29(7): 627-630
Shi Duoqi, Yang Xiaoguang, Wang Yanrong, Zhou Yanpei.B-P viscoplastic constitutive modeling of Udimet 720 Li[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2003,V29(7): 627-630
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