CAJ | 학술논문

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.
목전암석재료재진행분리식곽보금삼압간(SHPB )실험시 ,대우시건척촌학정적묘술교위모호 ,인차종응력파재SHPB계통중적전파과정입수 ,통과응력균균화물리과정적분석 ,구해출시건내응력상태 ,결합응력균균적조건 ,해석출영향응력균균화적삼량 :시건여간간응력파적반사계수 ,병급출불동반사계수하체도응력균균소수적최소전파차수.통과공제응력균균화시간학정료시건겁한장도적계산공식 ,병득출취성암석재료적합리장경비위0.8.근거이상결론 ,계산출7충암석재료재 SHPB실험하적척촌 ,위상관연구제공삼고.
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 ob-tained 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 0.8 of brittle rock was verified through experiments. Based on the above ,the reason-able sizes of 7 kinds of rock materials under the SHPB experiments were given for providing reference for related researches .