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Training Base Construction Project for Graduate Students in Chongqing","award":["CSTB2022NSCQ-LZX0049"],"award-info":[{"award-number":["CSTB2022NSCQ-LZX0049"]}]},{"name":"Joint Training Base Construction Project for Graduate Students in Chongqing","award":["JDLHPYJD2020026"],"award-info":[{"award-number":["JDLHPYJD2020026"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Understanding fracture mechanics in rock-like materials under compression-shear condition is critical for predicting failure mechanisms in various engineering applications, such as mining and civil infrastructure. This study conducted uniaxial compression tests on cubic gypsum specimens of varying sizes (side lengths of 75 mm, 100 mm, 125 mm, and 150 mm) and crack inclination angles (ranging from 0\u00b0 to 90\u00b0) to assess the size effect on fracture behavior. The effects of specimen size and crack inclination on fracture characteristics, including strength, failure mode, and crack initiation angle, were analyzed based on the maximum tangential stress (MTS) criterion and the generalized maximum tangential stress (GMTS) criterion, with relative critical size (\u03b1) and relative openness (\u03b7). Results indicate that the crack initiation angle increases with crack inclination, while compressive strength decreases significantly with increasing specimen size. For example, at a 30\u00b0 crack inclination, the peak compressive strength of 75 mm specimens was 2.53 MPa, whereas that of 150 mm specimens decreased to 1.05 MPa. Crack type and failure mode were found to be primarily influenced by crack inclination rather than specimen size. The experimental crack initiation angle aligned with the theoretical crack initiation angle at inclinations below 50\u00b0 but diverged at higher inclinations. A linear relationship was established between rc and specimen size (L) under compression-shear stress, expressed as rc=\u22120.01772L+3.54648; larger specimens exhibited increased tangential stress at the crack tip, leading to earlier macroscopic crack formation, while rc decreased as specimen size increased. These results underscore the significant influence of size on fracture behavior in quasi-brittle materials under compression-shear stress, providing essential insights for predicting material failure in rock-like structures.<\/jats:p>","DOI":"10.3390\/ma17235941","type":"journal-article","created":{"date-parts":[[2024,12,4]],"date-time":"2024-12-04T06:38:25Z","timestamp":1733294305000},"page":"5941","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Experimental Study on the Size Effect of Compression-Shear Fracture Characteristics of Rock-like Materials Containing Open Cracks"],"prefix":"10.3390","volume":"17","author":[{"given":"Zixuan","family":"Li","sequence":"first","affiliation":[{"name":"Engineering Research Center of Diagnosis Technology and Instruments of Hydro-Construction, Chongqing Jiaotong University, Chongqing 400074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiyuan","family":"Huang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chuan","family":"Lv","sequence":"additional","affiliation":[{"name":"Engineering Research Center of Diagnosis Technology and Instruments of Hydro-Construction, Chongqing Jiaotong University, Chongqing 400074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cheng","family":"Liao","sequence":"additional","affiliation":[{"name":"Jiangxi Academy of Water Science and Engineering, Nanchang 330029, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xudong","family":"Li","sequence":"additional","affiliation":[{"name":"Engineering Research Center of Diagnosis Technology and Instruments of Hydro-Construction, Chongqing Jiaotong University, Chongqing 400074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongbo","family":"Du","sequence":"additional","affiliation":[{"name":"Engineering Research Center of Diagnosis Technology and Instruments of Hydro-Construction, Chongqing Jiaotong University, Chongqing 400074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,12,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2200","DOI":"10.1016\/j.engfracmech.2010.03.009","article-title":"Geometry and size effects on fracture trajectory in a limestone rock under mixed mode loading","volume":"77","author":"Aliha","year":"2010","journal-title":"Eng. 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