岩石材料SHPB实验试件尺寸确定的研究  

STUDY ON THE DETERMINATION OF SPECIMEN SIZE IN SHPB EXPERIMENTS OF ROCK MATERIALS

作　　者：梁书锋[1] 吴帅峰[1] 李胜林[1] 刘殿书[1] 武若愚 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《工程爆破》2015年第5期1-5,共5页Engineering Blasting

基　　金：国家自然科学基金(10272109);高等学校博士学科点专项科研基金(No.20100023110001);中央高校基本科研业务费专项资金资助项目(2010QL05)

摘　　要：目前岩石材料在进行分离式霍普金森压杆(SHPB)实验时,对于试件尺寸确定的描述较为模糊,因此从应力波在SHPB系统中的传播过程入手,通过应力均匀化物理过程的分析,求解出试件内应力状态,结合应力均匀的条件,解析出影响应力均匀化的参量:试件与杆间应力波的反射系数,并给出不同反射系数下达到应力均匀所需的最小传播次数。通过控制应力均匀化时间确定了试件极限长度的计算公式,并得出脆性岩石材料的合理长径比为0.8。根据以上结论,计算出7种岩石材料在SHPB实验下的尺寸,为相关研究提供参考。At present,in the split Hopkinson pressure bar(SHPB)experiments of rock materials,the description of selecting specimen size is vague and the theoretical references are few.Therefore,this study started from the stress wave propagation in the SHPB system,and the stress state in specimen was obtained through analyzing the physical process of stress homogenization,the parameter of influencing stress homogenization:the reflection coefficient of wave impedances of specimen to SHPB was parsed out by combining with the condition of stress homogenization,and the minimum propagation number needed by stress homogenization under different reflection coefficient was given.The calculation formula of specimen limiting length was determined by controlling the time of stress homogenization and the reasonable aspect length diameter ratio 0.8of brittle rock was verified through experiments.Based on the above,the reasonable sizes of 7kinds of rock materials under the SHPB experiments were given for providing reference for related researches.

关 键 词：SHPB 应力波传播 长径比 试件尺寸 

分 类 号：TD235[矿业工程—矿井建设] O347.1[理学—固体力学]