摘要
利用SHPB试验系统,结合高速摄影技术,研究了冬瓜山铜矿深部采集的两种不同大理岩在动态劈裂下的应变率和强度、破坏应变之间的关系。实验数据表明,应变率对试样抗拉强度的影响较为显著,两种大理岩的动态抗拉强度随着应变率的增加而增大;灰色大理岩当应变率小于50s-1时,随着应变率的增加,动态拉伸强度敏感系数变化较大,当应变率大于50s-1时,动态拉伸强度敏感系数则变化不大,而白色大理岩则是在应变率大于120s-1后;随着应变率的增加,试样的破坏应变也随之增加。
Under the action of dynamic fracturing,the discipline between strain rate and strength,failure strain of two different marbles collected from the deep copper mine of Dongguashan are studied using SHPB test system in Central South University combined with high speed photography.Experimental results show that the tensile strength of the samples are significantly affected by the strain rate,the dynamic tensile strength of the two kinds of marble increases with the increase of strain rate;with the increase of strain rate,the dynamic tensile strength sensitive coefficient of the gray marble changes greatly when the strain rate is less than 50 s^-1,however,the change of the dynamic tensile strength sensitive coefficient of the white marble begins to become small after the strain rate is greater than 120 s^-1;The failure strain also increases with the increase of strain rate.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2012年第7期72-77,共6页
Journal of Wuhan University of Technology
基金
国家重点基础研究发展计划(973)(2010CB732004)
