摘要
为探讨炮孔不同割缝宽度对爆生裂纹动态扩展行为的影响,采用数字激光动态焦散线实验系统和分形理论,研究了6种不同割缝宽度时爆生裂纹的扩展规律。结果表明:割缝方向的爆生裂纹长度均大于非割缝方向的爆生裂纹长度;随着割缝宽度的增加,爆生裂纹扩展长度呈现先增大后减小的变化趋势;当割缝宽度增加到0.4 mm时,主裂纹扩展长度最大,割缝宽度继续增加后,主裂纹扩展长度减小。当割缝宽度为0.2和0.4 mm时,分形维数较其他割缝宽度更大,爆生主裂纹的扩展长度较其他宽度下的扩展长度更长,试件定向断裂效果更优。随着割缝宽度的增加,割缝主裂纹的扩展应力强度因子和速度峰值呈现先快速降低再增加至二次峰值,最后振荡下降的变化趋势。割缝宽度为0.2和0.4 mm时,主裂纹应力强度因子的峰值和扩展速度峰值较其他割缝宽度更大。研究成果可为实际爆破工程中的割缝参数选择提供依据。
To study the influence of slit width on the dynamic propagation behavior of blast cracks,the digital laser dynamic caustic line experimental system and fractal theory were used to study the propagation laws of blast cracks at six different crack widths.The results show that the length of burst cracks in the cut direction is greater than that in the non-cut direction.With the increase of the slit width,the propagation length of burst crack increases first and then decreases.When the slit width increases to 0.4 mm,the main crack propagation length is the largest,and when the slit width continues to increase,the main crack propagation length decreases.When the slit width is 0.2 and 0.4 mm,the fractal dimension is larger than that of other slit widths,the expansion length of the main crack is longer than that of other widths,and the directional fracture effect of the specimen is better.With the increase of the slit width,the stress intensity factor and velocity peak value of the main crack propagation of the slot shows a trend of first decreasing rapidly,then increasing to the secondary peak,and finally oscillating and decreasing.When the crack width is 0.2 and 0.4 mm,the peak value of the stress intensity factor and the expansion velocity of the main crack are larger than those of other crack widths.The research results provide a certain basis for the selection of slit parameters in actual blasting engineering.
作者
纪哲
岳文豪
苏洪
龚悦
严正团
刘步青
陈国栋
韩雨健
JI Zhe;YUE Wenhao;SU Hong;GONG Yue;YAN Zhengtuan;LIU Buqing;CHEN Guodong;HAN Yujian(School of Chemical and Blasting Engineering,Anhui University of Science and Technology,Huainan 232000,Anhui,China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2024年第6期89-99,共11页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(52104074)
精细爆破国家重点实验室开放基金(PBSKL2023A5)。
关键词
动态焦散线
裂纹扩展
应力强度因子
计盒维数
dynamic caustic lines
crack propagation
stress intensity factor
box dimension
