Experimental Study on Stress Uniformity and Deformation Behavior of Coals with Different Length-to-Diameter Ratios under Dynamic Compression

Table 1

Variation in the coal dynamic deformation behavior with the ratio.

No.	Diameter × length (mm)	Mass (g)	Impact rod velocity (m·s^−1)	Average strain rate, (s^−1)		Peak strain,		Peak stress, (MPa)
				Single sample value	Arithmetic average	Single sample value	Arithmetic average	Single sample value	Arithmetic average
D-0.3-1	49.98 × 14.53	35.56	7.10	289.12	296.49	0.0484	0.0461	41.70	38.54
D-0.3-2	49.97 × 15.71	38.12	7.39	275.45		0.0415		35.40
D-0.3-3	49.93 × 15.13	37.06	7.38	324.89		0.0485		38.52
D-0.4-1	49.97 × 19.94	48.13	7.00	201.16	210.66	0.0280	0.0304	35.46	39.92
D-0.4-2	49.96 × 20.16	48.95	7.28	184.89		0.0292		39.41
D-0.4-3	49.96 × 19.89	48.75	7.20	245.92		0.0341		44.89
D-0.5-1	49.91 × 25.31	60.70	7.40	178.48	184.64	0.0294	0.0264	35.71	36.57
D-0.5-2	49.92 × 25.21	62.71	7.44	178.14		0.0228		39.48
D-0.5-3	49.95 × 25.18	62.84	7.30	197.29		0.0271		34.51
D-0.6-1	49.96 × 30.44	73.91	7.00	164.53	175.15	0.0234	0.0245	32.08	32.13
D-0.6-2	49.94 × 30.37	76.11	7.37	180.46		0.0258		26.35
D-0.6-3	49.90 × 30.28	76.49	7.32	180.46		0.0244		38.52
D-0.7-1	49.97 × 35.34	86.04	6.93	144.65	146.97	0.0208	0.0203	30.31	31.75
D-0.7-2	49.90 × 35.16	86.36	7.29	153.29		0.0203		34.06
D-0.7-3	49.98 × 35.24	87.12	7.28	142.98		0.0197		30.88
D-0.8-1	49.93 × 40.24	98.33	6.97	121.49	131.47	0.0155	0.0172	29.85	32.30
D-0.8-2	49.93 × 40.18	100.05	7.29	137.01		0.0183		34.25
D-0.8-3	49.94 × 40.14	97.39	7.32	135.92		0.0179		32.79
D-0.9-1	49.97 × 45.65	115.75	7.04	106.25	112.99	0.0122	0.0141	30.94	31.92
D-0.9-2	49.73 × 45.63	114.15	7.39	134.53		0.0176		32.66
D-0.9-3	49.79 × 45.76	115.51	7.20	98.19		0.0124		32.15
D-1-1	49.96 × 50.50	124.14	6.83	101.65	102.85	0.0147	0.0143	25.53	27.69
D-1-2	49.97 × 50.56	129.86	7.23	105.93		0.0141		34.95
D-1-3	49.72 × 50.49	123.29	7.22	100.96		0.0141		22.60