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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。
Under the two cyclic modes of symmetrical constant stress and symmetrical constant plastic strain, the softening process of cold deformation Cu is similar and shows the same three stages. The softening curve of the same pre-deformation specimen under different loading amplitude is opposite with the changing trend of the week, and diverges under the stress control and converges under strain control. Both the annealed state and the cyclic saturation behavior of the pre-deformed samples show the experimental mode effect but are weakened by the pre-deformation.The softening threshold stress under stress control is about 0.43-0.45 times that of the prestrain flow stress, softening under strain control Threshold strain about (1-2) × 10 ~ 5, the two stress-strain correspondence.