磁脉冲改变残余应力方法中磁致振动所起作用

通过磁场改变材料的力学性能是一种新型处理材料的方式，其中公认的益处是通过磁处理可以减少材料的残余应力。通过测量发现，由于磁致振动所引起的应力应变状态始终处于弹性范围内变化，由此推断磁致振动难以成为应力大幅度变化的主要因素。又通过研究相应磁致振动所引起的残余应力变化规律，发现磁致振动的振幅与残余应力下降之间并不存在简单的单调对应关系，进一步支持了在磁致振动以外应有更为主要的决定因素影响残余应力变化的推论。

EFFECT OF THE MAGNETIC STRAIN VIBRATION IN RESIDUAL STRESS REDUCTION BY PULSED MAGNETIC TREATMENT

Magnetic treatment is a new processing technology used for reducing metal residual stress in recent years. In previous studies, magnetic strain vibration was considered to be the key answer for the changes of residual stress. Magnetic strain vibrations are recorded directly and found that the swing of the oscillation is so small that the stress is impossible to slide into any plastic state. Thus, it would be hard to suppose the magnetic strain vibrations are the main factor for the stress cut down. For more proof, the curve between strain vibration and stress variety is investigated. On the opposite of the presumption that stronger vibration with greater stress reduction in the earlier approaches, the relationship is more complex. Even in some conditions, strong vibration could cause stress increment. Thus it is more suitable to conclude that behind the strain vibration there were other more crucial factors controlling stress changes.