矿业科学学报2024，Vol.9Issue(1)：42-52,11.DOI:10.19606/j.cnki.jmst.2024.01.005
应力波作用下红砂岩复合动态断裂特征研究
Study on the dynamic fracture characteristics of red sandstone composite under stress waves
摘要
Abstract
To investigate the composite dynamic fracture characteristics of red sandstone under the action of stress waves,the impact loading experiment was carried out by using separated Hopkinson press bar,digital image technology and on the three-point bending specimen of semicircular disc with prefabricated cracks,to analyse the effects of loading rate and wavelength on the dynamic tensile and fracture characteristics of red sandstone.The results show that:①the loading rate of red sandstone spec-imens has a primary function relationship with the dynamic tensile strength,fracture toughness and dam-age rate;the fracture energy increases by 415.27%with the increase of loading rate.②With the in-crease of wavelength,the dynamic tensile strength increased by 742.14%,of which the fracture energy increased by 54.49%,but the energy absorption rate showed a decreasing trend;the average speed of crack expansion increased by 4.09%,and there is a hysteresis phenomenon in the time of strain growth of the first and last cracks;the effect of growth of the damage rate was strengthened.③The strain at the first and last monitoring points of the main crack of the specimen increased by 84.31%on average when the impact velocity was 8m/s.关键词
分离式霍普金森杆/半圆盘三点弯曲/应力波/复合断裂/数字图像相关Key words
split Hopkinson pressure bar/semi-circular bending/stress wave/compound fracture/digital image correlation分类
矿山工程引用本文复制引用
解北京,李晓旭,栾铮,陈思羽,陈铭进,梁天宇..应力波作用下红砂岩复合动态断裂特征研究[J].矿业科学学报,2024,9(1):42-52,11.基金项目
国家重点研发计划(2022YFC2904100) （2022YFC2904100）
中央高校基本科研业务费专项资金(2023ZKPYAQ04) （2023ZKPYAQ04）
安徽省爆破器材与技术工程实验室(AHBP2022A-03) （AHBP2022A-03）
