Energy Analysis Method for Uniaxial Compression Test of Sandstone under Static and Quasi-Dynamic Loading Rates

Table 2

Energy of uniaxial compression tests of sandstone under different loading rates.

Load (kN)	Elastic energy (J)	Input energy (J)
		Loading rates 1.0 × 10^−3 mm/s					Loading rates 5.0 × 10^−3 mm/s
		U1		U2	U3		U5	U6		U8
10	0.5336	1.3320		1.3211	1.3223		1.2367	1.2384		1.2312
20	1.7882	4.0105		4.0412	4.1324		3.8740	3.9113		3.9156
30	3.3095	7.3963		7.3623	7.4532		7.2965	7.2534		7.2678
40	5.3120	11.5936		11.6342	11.6734		11.0963	11.0256		11.0763
50	7.1649	16.6587		16.9275	16.9345		15.8355	15.8623		15.8623
60	9.3867	23.0339		23.0210	23.1056		21.5469	21.2532		21.3001
Load (kN)	Elastic energy (J)	Input energy (J)
		Loading rates 1.0 × 10^−2 mm/s			Loading rates 5.0 × 10^−2 mm/s			Loading rates 1.0 × 10^−1 mm/s
		U11	U12	U13	U15	U16	U18	U19	U20	U21
10	0.5336	1.2306	1.2312	1.2403	1.2274	1.2523	1.2589	1.2116	1.2045	1.2112
20	1.7882	3.6150	3.6534	3.6589	3.6972	3.7067	3.6612	3.6537	3.5882	3.5534
30	3.3095	6.9999	7.0022	7.0145	6.8737	6.8188	6.8023	6.8322	6.7346	6.8422
40	5.3120	10.8820	10.8748	10.8220	10.7414	10.7387	10.7254	10.5063	10.3532	10.4333
50	7.1649	15.4601	15.4831	15.4923	15.0345	15.1073	15.0534	14.8308	14.8543	14.5567
60	9.3867	20.8840	20.7921	20.8812	20.3363	20.3645	20.3734	19.5584	19.4652	19.4753
70	11.4210	28.4815	28.5938	28.6645	26.8837	26.8534	26.8378	25.7337	25.3425	25.3325