A unified viscoplasticity constitutive model for concrete materials is developed by mean of the framework of irreversible thermodynamics,and an expression for the Helmholtz free energy function involving the state variables of kinematic hardening and isotropic hardening is given,moreover a non-associated flow potential function including correspond state variables is used.

Under the Arso(1983) crystal plasticity framework,the constitutive model involves the kinematic hardening rule,and also takes into account the temperature and strain rate on the impact of crystal plastic deformation.

In view of these shortcomings,the rotational kinematic hardening theory is incorporated into modified Cambridge model,and the rotational hardening mechanism of ellipse yield surface is presented in the paper.

Theanalysis on the evolutions of the yield surface radius and the back stresses under symmetric and asymmetriccyclic strain loading with different strain amplitudes was made to explore the dependence of the evolutions ofthe material s kinematic hardening and isotropic hardening on the strain amplitude and mean strain.

Association of G-395A polymorphism of human Klotho gene with arteriosclerosis;

Investigation on relationship between jeopardous drinking for long and lipid metabolism,the changes of glucose tolerance as well as arteriosclerosis;

Discussing the Relations of Nervure Exhaustion and Oriental Arteriosclerosis;

The empirical study about detacting the rabbits abdominal aorta elasticity during the period of early artherosclerosis by color Dopplor ultrasound;

Objective To investigate the flexibility of abdominal aorta in rabbits with artherosclerosis(AS) by ultrasound,so as to investigate the relationship between artery flexibility and hypercholesterolemia or hyperhomocysteinemia.