1. 昆明理工大学 国土资源工程学院, 云南 昆明 650093
2. 矿冶科技集团有限公司, 北京 100160
*邮箱: wangjg0831@163.com
收稿:2022-11-11,
网络出版:2024-01-12,
纸质出版:2023-12-30
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马军, 汪旭光, 李祥龙, 等. 不耦合装药刻痕爆破裂纹的动态力学特征及损伤分形规律实验[J]. 兵工学报, 2023,44(12):3676-3686.
Jun MA, Xuguang WANG, Xianglong LI, et al. Experiment on Dynamic Mechanical Characteristics and Damage Fractal Law of Crack in Decoupled Charge Scratch Blasting[J]. Acta Armamentarii, 2023, 44(12): 3676-3686.
马军, 汪旭光, 李祥龙, 等. 不耦合装药刻痕爆破裂纹的动态力学特征及损伤分形规律实验[J]. 兵工学报, 2023,44(12):3676-3686. DOI: 10.12382/bgxb.2022.1270.
Jun MA, Xuguang WANG, Xianglong LI, et al. Experiment on Dynamic Mechanical Characteristics and Damage Fractal Law of Crack in Decoupled Charge Scratch Blasting[J]. Acta Armamentarii, 2023, 44(12): 3676-3686. DOI: 10.12382/bgxb.2022.1270.
为探究不耦合装药刻痕爆破裂纹的动态力学特征和损伤规律
采用动态焦散线实验技术研究不耦合系数
R
d
为1.00、1.33、1.67和2.00时聚甲基丙烯酸甲酯(PMMA)的爆炸裂纹扩展的动态力学特征
结合分形维数理论计算爆后损伤变量和分形维数。研究结果表明:
R
d
<
1.67时
炮孔周围分区的损伤变量都较大
且在炮孔非刻痕方向形成了较多次生裂纹;
R
d
=1.67时
炮孔左、右裂纹的动态力学行为相似
爆后损伤变量和分形维数最小;随着
R
d
的增大
爆炸主裂纹长度减小
主裂纹扩展的速度、应力强度因子和动态能量释放率减小
但裂纹扩展时间增加
爆生气体的准静态作用延长
爆生气体作用对裂纹的再次激活、起裂、扩展和止裂的动态力学行为影响
在一定程度上实现了动、静作用分离的量化分析;自由边界条件下PMMA不耦合装药刻痕爆破的损伤变量
ω
与分形维数
D
关系为
ω
=0.00175
D
9.04
。
In order to study the dynamic mechanical characteristics and damage law of crack in decoupled charge structure scratch blasting
the dynamic mechanical characteristics of PMMA explosive crack propagation with the decoupled coefficients of 1.00
1.33
1.67 and 2.00 are studied by appling the dynamic caustics experimental technology. The damage variable and fractal dimension after blasting are calculated by fractal dimension theory. The results show that
for
R
d
<
1.67
the damage variables of the partitions around a blasthole are larger
and there are more secondary cracks in the non-scratched direction of the blasthole. For
R
d
=1.67
the dynamic mechanical behaviors of the left and right cracks on the blasthole are similar
and the damage variables and fractal dimension are the smallest. With the increase of the decoupled coefficient
the length of the main crack decreases
the propagation speed of the main crack
the stress intensity factor and the dynamic energy release rate decreases
but the crack propagation time increases and the quasi-static effect of the explosive gas is prolonged. The dynamic mechanical characteristics of reactivation
initiation
propagation and stop of crack under the action of explosive gas have realized the quantitative analysis of dynamic and static separations to a certain extent. The relationship between the damage variable and fractal dimension of PMMA decoupled charge structure scratch blasting under free boundary conditions is
ω
=0.00175
D
9.04
.
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