Direct shear testing of brittle material samples with non-persistent cracks

被引:4
作者
Haeri, Hadi [1 ]
Sarfarazi, Vahab [2 ]
Shemirani, Alireza Bagher [3 ]
Zhu, Zheming [1 ]
机构
[1] Sichuan Univ, Coll Architecture & Environm, Chengdu 610065, Sichuan, Peoples R China
[2] Hamedan Univ Technol, Dept Min Engn, Hamadan, Iran
[3] Shahid Beheshti Univ, Dept Civil Water & Environm Engn, Tehran, Iran
关键词
bridge area; failure mechanism; crack propagation; direct shear test; JOINTED ROCK MASS; DYNAMIC FRACTURE-TOUGHNESS; SLOPE STABILITY; PROPAGATION MECHANISM; COALESCENCE MECHANISM; UNIAXIAL COMPRESSION; NUMERICAL-ANALYSIS; BEAM SPECIMENS; MODE-I; BEHAVIOR;
D O I
10.12989/gae.2018.15.4.927
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The mechanical behavior of the brittle material samples containing the internal and edge cracks are studied under direct shear tests. It is tried to investigate the effects of stress interactions and stress intensity factors at the tips of the pre-existing cracks on the failure mechanism of the bridge areas within these cracks. The direct shear tests are carried out on more than 30 various modeled samples each containing the internal cracks (S models) and edge cracks (E models). The visual inspection and a low power microscope are used to monitor the failure mechanisms of the tested samples. The cracks initiation, propagation and coalescences are being visualized in each test and the detected failure surfaces are used to study and measure the characteristics of each surface. These investigations show that as the ratio of the crack area to the total shear surface increases the shear failure mode changes to that of the tensile. When the bridge areas are fixed, the bridge areas in between the edge cracks have less strength than those of internal cracks. However, the results of this study show that for the case of internal cracks as the bridge area is increased, the strength of the material within the bridge area is decreased. It has been shown that the failure mechanism and fracture pattern of the samples depend on the bridge areas because as the bridge area decreases the interactions between the crack tip stress fields increases.
引用
收藏
页码:927 / 935
页数:9
相关论文
共 59 条
[11]   Composite rock slope kinematics at the current Randa instability, Switzerland, based on remote sensing and numerical modeling [J].
Gischig, V. ;
Amann, F. ;
Moore, J. R. ;
Loew, S. ;
Eisenbeiss, H. ;
Stempfhuber, W. .
ENGINEERING GEOLOGY, 2011, 118 (1-2) :37-53
[12]   A design methodology for rock slopes susceptible to wedge failure using fracture system modelling [J].
Grenon, Martin ;
Hadjigeorgiou, John .
ENGINEERING GEOLOGY, 2008, 96 (1-2) :78-93
[13]  
Griffith AA. VI, 1921, Philos. Trans. R. Soc. London, V221, P163, DOI 10.1098/rsta.1921.0006
[14]   EXPERIMENTAL AND NUMERICAL SIMULATION OF THE MICROCRACK COALESCENCE MECHANISM IN ROCK-LIKE MATERIALS [J].
Haeri, H. ;
Khaloo, A. ;
Marji, M. F. .
STRENGTH OF MATERIALS, 2015, 47 (05) :740-754
[15]   Propagation Mechanism of Neighboring Cracks in Rock-Like Cylindrical Specimens under Uniaxial Compression [J].
Haeri, H. .
JOURNAL OF MINING SCIENCE, 2015, 51 (03) :487-496
[17]  
Haeri H., 2013, P 13 INT C FRACT BEJ
[18]   Fracture analyses of different pre-holed concrete specimens under compression [J].
Haeri, Hadi ;
Khaloo, Alireza ;
Marji, Mohammad Fatehi .
ACTA MECHANICA SINICA, 2015, 31 (06) :855-870
[19]   Influence of the inclined edge notches on the shear-fracture behavior in edge-notched beam specimens [J].
Haeri, Hadi .
COMPUTERS AND CONCRETE, 2015, 16 (04) :605-623
[20]   Experimental and numerical analysis of Brazilian discs with multiple parallel cracks [J].
Haeri, Hadi ;
Khaloo, Alireza ;
Marji, Mohammad Fatehi .
ARABIAN JOURNAL OF GEOSCIENCES, 2015, 8 (08) :5897-5908