Zhou Benlian

The effect of high current pulsing on persistent slip bands in fatigued copper single crystals

Copper single crystals fatigued along [(1) over bar 23] loading axis were treated by high current pulsing after the formation of persistent slip bands (PSBs). The results show that the treatment by electropulsing made the PSBs vanish locally. This is due to the thermal compressive stress induced by electropulsing, which reduced the stress concentration at the interface between PSBs and matrix. The annihilation of edge dislocations reduced the width of PSBs and made the PSBs vanish locally. The main factor that made the dislocations move was the thermal compressive stress. The velocity of the dislocation motion is about (10(3)-10(2)) cm s(-1)

Effects of prestrain on the fatigue properties of VIRALL laminate

The effect of post-cure straining on the fatigue properties of VIRALL laminates has been investigated experimentally. It ir found that the fatigue life is prolonged with the increase of prestrain. By analysing the variations of the inner ply stresses of aluminum sheets and vinylon/epoxy layers in VIRALL with increasing prestrain, it is shown that the influence of prestrain on fatigue properties is attributed to the changes in the states of the inner ply stress in aluminum sheets and vinylon/epoxy layers