The Load Capacity Model and Experimental Tests of a New Yielding Steel Prop

Table 2

Property and geometry parameters of the model.

Parameters	Value
Radius of steel ball (/mm)	2.5
The outer diameter of the inner tube (/mm)	90
The inner diameter of the inner tube (/mm)	70
Young’s modulus of inner tube (/GPa)	210
Poisson’s ratio of steel ball and prop	0.3
Friction coefficient	0.03
Yield stress of inner tube (/MPa)	690