Influence of Multi-factor Coupling Effect on Dynamic Characteristics of Layered Phyllite

doi:10.12068/j.issn.1005-3026.2024.03.009

Abstract

Abstract:

In order to study the effect of strain rate on the dynamic characteristics of phyllite under different length?diameter ratio and dip angle， the samples with four dip angles （ $α$ =0°， 30°， 60° and 90°） and two lengths （L=25， 50 mm） were selected as research objects. The dynamic compression tests under different impact pressures （p=0.150， 0.175， 0.200， 0.225 and 0.250 MPa） were carried out by using the split Hopkinson pressure bar （SHPB） system. The dynamic characteristics of phyllite with two aspect ratios at different strain rates were studied， and the influence of the coupling effect between the bedding dip angle， aspect ratio and strain rate on the strength characteristics of phyllite was analyzed. The results show that under dynamic compression， the dynamic compressive strength of phyllite with two different aspect ratios decreases first and then increases with the increase of bedding angle， and the dynamic peak strength and peak strain increase with the increase of strain rate. The relationship between dynamic compressive strength of phyllite and strain rate follows a power function. The relationship between peak strength and bedding angle α and L/D is binary function. When α=60°， the aspect ratio effect on the dynamic compressive strength of phyllite is the most significant， and when L/D=2， the dip angle effect is the most significant. Under different bedding dip angles， the aspect ratio effect of peak strain is the most significant at 0°dip angle， and the weakest at 90°dip angle. The strain rate effect on dynamic compressive strength and peak strain of phyllite under dynamic impact is stronger than that of aspect ratio effect.

Key words: rock mechanics, layered phyllite, SHPB test, dynamic characteristics, multi?factor coupling

CLC Number:

TU 45

Jiang-bo XU, Guo-zheng SUN, Xin-min HOU, Yang-lin YU. Influence of Multi-factor Coupling Effect on Dynamic Characteristics of Layered Phyllite[J]. Journal of Northeastern University(Natural Science), 2024, 45(3): 372-381.

Figures/Tables 15

Fig.1 Directional coring for layered phyllite

Fig.2 Layered phyllite samples

Table 1 Parameters of layered phyllite samples with 4 bedding inclination angles and 2 different lengths

倾角/(°)	试样编号	L/mm	L/D	p/MPa	σ₀/MPa	ε_max×10³	$ε ˙$ /s^-1
0	QJ00-25-01	25	0.52	0.150	125.97	6.04	92
	QJ00-25-02	25	0.52	0.175	136.11	9.85	112
	QJ00-25-03	25	0.52	0.200	142.14	10.78	125
	QJ00-25-04	25	0.52	0.225	148.17	12.37	136
	QJ00-25-05	25	0.52	0.250	154.93	16.30	151
	QJ00-50-01	50	1.01	0.150	92.71	7.86	69
	QJ00-50-02	50	1.01	0.175	120.73	9.57	86
	QJ00-50-03	50	1.02	0.200	150.14	10.81	105
	QJ00-50-04	50	1.01	0.225	170.52	12.63	113
	QJ00-50-05	50	0.99	0.250	184.29	13.42	127
30	QJ30-25-01	25	0.51	0.150	117.68	5.16	92
	QJ30-25-02	25	0.51	0.175	123.96	6.96	112
	QJ30-25-03	25	0.51	0.200	128.01	8.59	125
	QJ30-25-04	25	0.51	0.225	134.98	9.84	136
	QJ30-25-05	25	0.51	0.250	137.79	11.44	151
	QJ30-50-01	50	1.03	0.150	92.71	7.02	69
	QJ30-50-02	50	1.03	0.175	117.39	8.28	86
	QJ30-50-03	50	1.03	0.200	124.11	9.08	105
	QJ30-50-04	50	1.03	0.225	135.98	9.88	113
	QJ30-50-05	50	1.03	0.250	156.54	10.93	127
60	QJ60-25-01	25	0.51	0.150	89.33	5.14	92
	QJ60-25-02	25	0.50	0.175	106.24	6.95	112
	QJ60-25-03	25	0.50	0.200	112.39	9.29	125
	QJ60-25-04	25	0.50	0.225	116.39	9.49	136
	QJ60-25-05	25	0.50	0.250	122.98	10.58	151
	QJ60-50-01	50	1.02	0.150	58.39	5.16	69
	QJ60-50-02	50	1.02	0.175	81.46	6.60	86
	QJ60-50-03	50	1.03	0.200	99.55	8.63	105
	QJ60-50-04	50	1.01	0.225	106.59	9.65	113
	QJ60-50-05	50	1.01	0.250	127.37	10.61	127
90	QJ90-25-01	25	0.52	0.150	125.54	8.10	92
	QJ90-25-02	25	0.52	0.175	131.77	10.95	112
	QJ90-25-03	25	0.52	0.200	138.17	11.56	125
	QJ90-25-04	25	0.53	0.225	142.60	12.73	136
	QJ90-25-05	25	0.53	0.250	150.96	13.09	151

Table 1 Parameters of layered phyllite samples with 4 bedding inclination angles and 2 different lengths

倾角/(°)	试样编号	L/mm	L/D	p/MPa	σ₀/MPa	ε_max×10³	$ε ˙$ /s^-1
0	QJ00-25-01	25	0.52	0.150	125.97	6.04	92
	QJ00-25-02	25	0.52	0.175	136.11	9.85	112
	QJ00-25-03	25	0.52	0.200	142.14	10.78	125
	QJ00-25-04	25	0.52	0.225	148.17	12.37	136
	QJ00-25-05	25	0.52	0.250	154.93	16.30	151
	QJ00-50-01	50	1.01	0.150	92.71	7.86	69
	QJ00-50-02	50	1.01	0.175	120.73	9.57	86
	QJ00-50-03	50	1.02	0.200	150.14	10.81	105
	QJ00-50-04	50	1.01	0.225	170.52	12.63	113
	QJ00-50-05	50	0.99	0.250	184.29	13.42	127
30	QJ30-25-01	25	0.51	0.150	117.68	5.16	92
	QJ30-25-02	25	0.51	0.175	123.96	6.96	112
	QJ30-25-03	25	0.51	0.200	128.01	8.59	125
	QJ30-25-04	25	0.51	0.225	134.98	9.84	136
	QJ30-25-05	25	0.51	0.250	137.79	11.44	151
	QJ30-50-01	50	1.03	0.150	92.71	7.02	69
	QJ30-50-02	50	1.03	0.175	117.39	8.28	86
	QJ30-50-03	50	1.03	0.200	124.11	9.08	105
	QJ30-50-04	50	1.03	0.225	135.98	9.88	113
	QJ30-50-05	50	1.03	0.250	156.54	10.93	127
60	QJ60-25-01	25	0.51	0.150	89.33	5.14	92
	QJ60-25-02	25	0.50	0.175	106.24	6.95	112
	QJ60-25-03	25	0.50	0.200	112.39	9.29	125
	QJ60-25-04	25	0.50	0.225	116.39	9.49	136
	QJ60-25-05	25	0.50	0.250	122.98	10.58	151
	QJ60-50-01	50	1.02	0.150	58.39	5.16	69
	QJ60-50-02	50	1.02	0.175	81.46	6.60	86
	QJ60-50-03	50	1.03	0.200	99.55	8.63	105
	QJ60-50-04	50	1.01	0.225	106.59	9.65	113
	QJ60-50-05	50	1.01	0.250	127.37	10.61	127
90	QJ90-25-01	25	0.52	0.150	125.54	8.10	92
	QJ90-25-02	25	0.52	0.175	131.77	10.95	112
	QJ90-25-03	25	0.52	0.200	138.17	11.56	125
	QJ90-25-04	25	0.53	0.225	142.60	12.73	136
	QJ90-25-05	25	0.53	0.250	150.96	13.09	151

Table 2 Relationship between impact air pressure and bullet velocity and strain rate of sample

冲击气压 p/MPa	子弹速度 v/（m·s^-1）	应变率/s^-1
冲击气压 p/MPa	子弹速度 v/（m·s^-1）	L=25 mm	L=50 mm
0.150	6.8	92	69
0.175	7.4	112	86
0.200	8.5	125	105
0.225	9.2	136	113
0.250	9.3	151	127

Fig.3 Relationship between impact pressure and strain rate

Fig.4 Stress?strain curves of layered phyllite at L=25 mm

Fig.5 Stress?strain curves of layered phyllite at L=50 mm

Fig.6 Relationship curves between phyllite dip angle

Fig.7 Relationship between dynamic compressive strength and strain rate of layered phyllite under four dip angles （a）—α=0°；（b）—α=30°；（c）—α=60°；（d）—α=90°.

Fig.8 Relationship between peak strain and strain

Fig.9 Surface of the parameter σmax as a function of α and L/D

Fig.10 Surface of the parameter σmax as a function

Fig.11 Surface of the parameter εmax as a function of α and L/D

Fig.12 Surface of the parameter εmax as a function of ε˙ and L/D

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