在表面失稳以前，半无限体的变形是有限的。
The deformation of the half space is finite before the surface buckling occurs.
建立了圆冲头压入半无限体的运动许可速度场；
The kinematically admissible velocity field for the indentation of semi infinite medium by a round flat punch has been established.
在弹性半无限体理论空间解的基础上导出了应力扩散角的建议值。
Based on the spacial solution of the elastic semiinfinite element theory, the suggested value of the stress spread Angle has been derived.
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