The Experimental Study and Constitutive Description on Cyclic Creep/Relax Behavior of Magnesium Alloy;

In order to quantitatively describe the damage of interaction between fatigue and cyclic creep,a new damage parameter considered stress rate and elasticity modulus rate was proposed to define the damage variable.

In order to quantitatively describe the damage of interaction between fatigue and cyclic creep,a new damage parameter named equivalent modulus was proposed to define the damage variable,and a continuum damage mechanics(CDM) model considering both effects of maximum stress and temperature on damage evolution was put forward.

The cyclic creep tests of a Nickel-base superalloy has been conducted on a High Temperature Electrical Creep Machine equipped with an External Digital Controler (EDC).

In this paper, some facts of creeping environment problems in Hexi region of Gansu province were given, it was pointed out that environment deterioration and climate abnormity aroused by human activities could impact on the persistent development of society and economy, people should think much of this problem.

Some researches on the creeping environmental problems in recent years in International Center for Creeping Environmental Problems of Lanzhou were reviewed,including definition,significance,cases and countermeasures on creeping environment,and relationships among human activities,global warming and creeping environment.