The Coupled Effect of Loading Rate and Grain Size on Tensile Strength of Sandstones under Dynamic Disturbance

Table 3

Summary of dynamic tensile test results with different grain sizes.

Types of sandstone	Impact velocity (m/s)	Specimen number	Diameter (mm)	Thickness (mm)	Stress rate (GPa/s)	Dynamic tensile strength (MPa)
Coarse grain	2.0	C-1	49.98	24.97	25.7	5.34
	2.5	C-2	49.88	24.99	65.5	7.57
	3.3	C-3	50.12	25.03	125.4	10.23
	4.2	C-4	50.23	25.12	180.7	13.75
Medium grain	2.0	M-1	48.73	24.87	62.5	10.4
	2.5	M-2	49.23	25.23	88.2	13.6
	3.3	M-3	49.87	24.96	126.5	17.8
	4.2	M-4	50.24	24.98	176.7	22.5
Fine grain	2.0	F-1	49.99	25.01	86.8	14.3
	2.5	F-2	48.94	25.14	115.7	19.5
	3.3	F-3	51.22	24.99	227.5	29.8
	4.2	F-4	49.87	24.98	328.6	36.5