基于弹粘塑性本构关系 ,讨论了附加振动时单轴拉伸的应变及应力变化过程。分析结果表明 ,本文所给出的力学模型 ,再现了振动拉伸过程中的应力超调及平均应力降低等现象 Based on the elasto-viscoplastic constitutive relation, the stress and strain of uniaxial tension during additional vibration are discussed. The analysis results show that the mechanical model presented in this paper reproduces the phenomenon of stress overshoot and average stress drop in the process of vibration stretching