Foaming Agent,OBSH Foaming Agent,Chemical Foaming Agents,Best Foaming Agent,Foaming Agent Price GuangDong DuBa New Material Technology Co.,LTD , https://www.dubachem.com The shape and test method of the sample are shown in Figure 1. When the tensile force p is pulled off on the test machine, the tensile strength of the rock is: σ=10p/A, MPa The initial cross-sectional area of ​​the A-rock break section, cm 2 . 
Figure 1 Uniaxial tensile strength test