边切槽圆盘试样的岩石动态断裂韧度实验

长江科学院院报 ›› 2006, Vol. 23 ›› Issue (2): 54-57.

边切槽圆盘试样的岩石动态断裂韧度实验

李战鲁, 王启智, 李伟

出版日期:2006-04-01 发布日期:2012-03-05

Experiment on Dynamic Rock Facture ToughnessUsing Edge - notc
hed Disc Specimen

LI Zhan-Lu, WANG Qi-Zhi, LI Wei

Online:2006-04-01 Published:2012-03-05

摘要/Abstract

摘要： 提出用边切槽圆盘试样测量岩石动态断裂韧度的实验方法。在分离式霍普金森压杆(Split Hopkinson Pressure Bar-SHPB)的入射杆杆端附加劈尖及其基座，实现对试样施加高速率的劈裂载荷；将劈裂载荷时间历程及裂纹扩展时间输入有限元法计算模型得到动态应力强度因子时间历程；3个应变片粘贴在试样的切槽前端韧带上，测定裂纹扩展起始时间和扩展过程；结合动态应力强度因子历程和裂纹扩展时间，获得试样的起裂动态断裂韧度值。对大理岩实验的结果表明，边切槽圆盘试样能得到理想的劈裂加载；当加载速率为2.88×104 MPa·m1/2·s-1时，所测大理岩的动态断裂韧度为5.15 MPa·m1/2，大理岩的断裂韧度在高加载速率下明显地提高。

Abstract: An experiment on dynamic rock fracture toughness test using edge - notched disc specimen is presented. Split Hopkinson pressure bar(SHPB) with a wedge and its holder appended to the end of its incident bar is used to get high loading rate split forces; three strain gauges ar e attached along the ligament in front of the crack in order to detect initiation time and crack process; and then put the splitting force history and initiation time into finite element method to obtain dynamic fracture toughness at crack initiation. The marble specimen experiment result indicates that: a perfect splitting load can be gotten from combination of SHPB and wedge; the dynamic response of marble lags behind the load of SHPB; the crack expands fast; the dynamic marble fracture toughness of edge - notch specimen increases markedly under high loading rate, and its 5.15 MPa·m1/2 at the loading rate of 2.88×104 MPa·m1/2s-1.

李战鲁, 王启智, 李伟. 边切槽圆盘试样的岩石动态断裂韧度实验[J]. 长江科学院院报, 2006, 23(2): 54-57.

LI Zhan-Lu, WANG Qi-Zhi, LI Wei. Experiment on Dynamic Rock Facture ToughnessUsing Edge - notc
hed Disc Specimen[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2006, 23(2): 54-57.