韩东波,赵光明,孟祥瑞,马文伟

• 1:安徽理工大学能源与安全学院
• 2:重庆大学西南资源开发及环境灾害控制工程教育部重点实验室

摘要(Abstract)：

利用直径30 mm的分离式霍普金森压杆,对不同弹速下砂岩试样进行巴西圆盘劈裂实验,研究砂岩在高应变率下的动态抗拉强度及试样的破坏模式,得到了砂岩的动态抗拉强度随着应变率的提高而增加。其中,在应变率小于316/s时,动态抗拉强度随着应变率的增加而大幅增大,在应变率高于316/s时,动态抗拉强度随着应变率的增加而平缓的增加。考虑了压杆撞击速度及试样尺寸对试样的破坏时刻、应变率的影响,通过试样表面贴应变片观测发现试样是由中心向两端发展的起裂顺序。同时,利用ANSYS-LYDYNA有限元对巴西圆盘试样的动态应力分布进行数值模拟,验证了动态劈裂拉伸实验的有效性。

关键词(KeyWords)： 巴西圆盘;劈裂;动态抗拉强度;应变率;破坏时刻;破坏模式

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51174005);; 霍英东青年教师基金基础性研究资助课题(121050);; 重庆大学西南资源开发及环境灾害控制工程教育部重点实验室访问学者基金

作者(Author): 韩东波,赵光明,孟祥瑞,马文伟

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