【摘要】 在对称恒应力和对称恒塑性应变两种循环方式下,冷变形 Cu 的软化过程具有相似性,表现出相同的三个阶段。不同戴荷幅下同一预变形试样的软化曲线随周次的变化趋势却是相反的,应力控制下发散,应变控制下会聚。退火态及预变形试样的循环饱和行为都表现出试验方式效应,但被预变形所削弱.应力控制下的软化门槛应力约为预应变流变应力的0.43—0.45倍,应变控制下的软化门槛应变约为(1—2)×10~5,两者的应力-应变对应关系一致。更多还原

【Abstract】 There is similarity of softening processes of cold strained Cu between constant stress andconstant plastic strain controled tests.Both processes behave the same three stages.However,the trend ofsoftening curve tends to scatter under stress controled tests while becomes convergent under strain controledtests.Both cyclic stress-strain curves of the annealed and prestiained specimens have the testing mode effectbut decreased by prestraining.The softening threshold is about 0.43～0.45 of prstraining flow stress understress control and plastic strain amplitude （1～2）×10^-5 under plastic strain control respectively,and they areconsistent.更多还原