The relative longitudinalstrain between the strip edge and strip center is very small in the whole deformed zone, which can prevent appearing crinkling and bloating.
在整个变形区内板带边缘和中心的纵向相对应变较小，可以防止边缘出现起皱、鼓包。
2
From 0 load till about 0.8 times the ultimate load bearing capacity, the steel tube longitudinalstrain distribution along the depth of cross-section obeys the plain section assumption.
从加载之初直到大约0.8倍的极限承载力，试件纵向应变沿截面高度的分布基本符合平截面假定。
3
According to the results, during of the axisymmetry deformation, longitudinal anisotropy and transversal isotropy of polycrystal were obvious with the effective strain increasing.