在塑性区，水平及垂直应力均是上凹的。
The horizontal and vertical stresses are concave upward in plastic zone.
峰后泊松比与轴向压应力之间的关系可能是一条直线，也可能是上凸的，或上凹的。
It is possible for linear, upwards concave or upwards convex relations between the post-peak Poisson's ratio and the flow compressive stress.
三稳定 格子结构单元有三个稳定形状，三个稳定形状是平面矩形格子、下凹 曲面格子和上凹曲面格子。
Each tristable lattice structure unit has three stable shapes, wherein the three stable shapes are planer rectangular lattices, lower concave curved lattices and upper concave curved lattices.
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