Study on triaxial mechanical behavior and energy evolution of composite rock with coplanar double fractures by Yujie SI, Taoli XIAO, Hao YUAN, Haicheng SHE, Yunfeng ZHAO

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Interaction between line cracks in an orthotropic layer by Subir Das

“…We deal with the interaction between three coplanar Griffith cracks located symmetrically in the mid plane of an orthotropic layer of finite thickness 2h. …”
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Three-dimensional numerical simulation on fracture mechanical behavior and acoustic emission characteristics of rectangular sandstone containing non-coplanar fissures under convent... by Sheng-Qi Yang, Yue Li, Peng-Fei Yin, Zhen Zhong, Xiao-Shuang Li, Yu Song

“…The confining pressure and prefabricated fissures obviously affected the crack failure behavior of the specimens. The inner cracks transitioned from tensile to shear fractures with the increase of confining pressure. …”
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Influence of the Preexisting Fracture Network on the Mechanical Properties of Rock Mass and the Secondary Crack Propagation by Ping Guo, Guodong Li, Feng Luo, Xiaojun Tang

“…Based on the load-bearing capacity of PFN-containing rock mass, the stress–strain curves can be classified into two types: type I curve has multipeak and is strain-softening in the postpeak stage when β is 15°, 30°, 45°, 60°, and 90°; type II curve is unimodal and with brittle failure when β is 60° and 75°. Secondary crack propagation can be classified into four main types: type I is the coplanar crack, type II is the wing crack around PFN, type III is the near-field wing crack, and type IV is the macroscopic shear crack.…”
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Frost-Heaving Cracking Sensitivity of Single-Flaw Rock Mass Based on a Numerical Experimental Method by Tingting Wang, Chun’an Tang, Pingfeng Li, Shibin Tang, Minghao Liu, Bingbing Zhang

“…Overall, the results indicate that preexisting flaw with various inclination angles, flaw lengths, and cooling rates mainly propagates along the flaw-coplanar direction. The secondary crack failure mode is most affected by the flaw width, and the length of the secondary crack increases with increasing inclination angle, flaw width, and flaw length, but decreases with increasing cooling rate. …”
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Meso-mechanical properties and energy evolution characteristics of fractured sandstone under mining stress path by Xuefeng LI, Chao PAN, Juncai CAO, Lin YAN, Tengfei HAN, Xu HONG

“…The results show that: with the increase of fracture length, the peak strength and elastic modulus of sandstone decrease, while with the increase of fracture angle, the peak strength and elastic modulus of sandstone first decrease and then increase; four types of cracks, namely coplanar shear cracks, anti-shear cracks, tensile cracks and far-field tensile cracks, are produced during specimen failure, and the main cause of specimen failure is the expansion of shear cracks from the tip to the end of the prefabricated cracks; the shear cracks show an evolution trend of coplanar-non-coplanar-coplanar with the fracture length, while the shear cracks show an evolution trend of coplanar-non-coplanar with the fracture angle; the influence of prefabricated fractures on the surrounding displacement field increases with the increase of fracture length and shows a change of first increasing and then decreasing with the increase of fracture angle; the energy release coefficient k shows a changing trend of decreasing-increasing-decreasing-steady decreasing, and the failure strength of the rock can be evaluated by the energy coefficient kc at the peak stress based on energy evolution.…”
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Frost heave cracking and uniaxial compression failure behavior of sandstone samples containing a flaw filled with water by Duofeng Cen, Yage Li

“…Frost heave cracks initiate and extend along the coplanar direction of flaws. …”
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Fatigue crack growth of aluminium alloy 7075-T651 under non-proportional mixed mode I and II loads by Xiaobo Yu, Ling Li, Gwenaelle Proust

“…Fatigue tests were performed under cyclic tension and torsion using a thin-walled tubular specimen with a key-hole style crack starter. After the generation of a single-side mode I pre-crack, varied forms of mixed mode loads were applied, which in most cases led to a short distance coplanar growth followed by a long and stable crack path deviation. …”
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Fatigue crack growth of aluminium alloy 7075-T651 under non-proportional mixed mode I and II loads by Xiaobo Yu, Ling Li, Gwénaëlle Proust

“…Fatigue tests were performed under cyclic tension and torsion using a thin-walled tubular specimen with a key-hole style crack starter. After the generation of a single-side mode I pre-crack, varied forms of mixed mode loads were applied, which in most cases led to a short distance coplanar growth followed by a long and stable crack path deviation. …”
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Numerical Analysis of Fracture Behaviour on Marble Samples Containing Two Flaws by Lifei Zheng, Dan Huang, Xiaoqing Li, Xuan Hu

“…Uniaxial compression tests were conducted on marble specimens containing two flaws. There are coplanar flaws and noncoplanar flaws. The inclination angle and spacing of flaws were considered of the coplanar flaws model, and the step angle and spacing of flaws were considered of the noncoplanar flaws model. …”
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An Experimental Study on Mechanical Behavior of Parallel Joint Specimens under Compression Shear by Fei Wang, Ping Cao, Yu Chen, Qing-peng Gao, Zhu Wang

“…The joint overlap affects the crack development of the specimen but does not change the failure mode of the specimen. …”
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Fracture damage and energy evolution of fissured coal subject to triaxial unloading condition by Zhijie Zhu, Peng Wang, Xiaohan Yang, Jan Nemcik, Ting Ren, Laigui Wang, Jun Han, Songsong Guan

“…Secondary cracks were generated starting from both ends of the fissure. …”
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