Compression-Induced Tensile Mechanical Behaviors of the Crystalline Rock under Dynamic Loads
| العنوان: | Compression-Induced Tensile Mechanical Behaviors of the Crystalline Rock under Dynamic Loads |
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| المؤلفون: | Xiaolin Huang, Shengwen Qi, Songfeng Guo, Liang Ning, Bowen Zheng |
| المصدر: | Materials Volume 13 Issue 22 |
| بيانات النشر: | MDPI, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | compression-induced tensile behavior, Morphology (linguistics), Materials science, crystalline rock, microstructure, 0211 other engineering and technologies, Micromechanics, 02 engineering and technology, 010502 geochemistry & geophysics, Microstructure, 01 natural sciences, Dynamic load testing, Article, UDEC, dynamic load, grain-based model, Tension (geology), Ultimate tensile strength, grain heterogeneity, Loading rate, General Materials Science, Compression (geology), Composite material, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences |
| الوصف: | Characterization of the tensile mechanical behaviors of rocks under dynamic loads is of great significance for the practical engineering. However, thus far, its micromechanics have rarely been studied. This paper micromechanically investigated the compression-induced tensile mechanical behaviors of the crystalline rock using the grain-based model (GBM) by universal distinct element code (UDEC). Results showed that the crystalline rock has the rate- and heterogeneity-dependency of tensile behaviors. Essentially, dynamic Brazilian tensile strength increased in a linear manner as the loading rate increased. With the size distribution and morphology of grain-scale heterogeneity weakened, it increased, and this trend was obviously enhanced as the loading rate increased. Additionally, the rate-dependent characteristic became strong with the grain heterogeneity weakened. The grain heterogeneity prominently affected the stress distribution inside the synthetic crystalline rock, especially in the mixed compression and tension zone. Due to heterogeneity, there were tensile stress concentrations (TSCs) in the sample which could favor microcracking and strength weakening of the sample. As the grain heterogeneity weakened or the loading rate increased, the magnitude of the TSC had a decreasing trend and there was a transition from the sharp TSC to the smooth tensile stress distribution zone. The progressive failure of the crystalline rock was notably influenced by the loading rate, which mainly represented the formation of the crushing zone adjacent to two loading points. Our results are meaningful for the practical engineering such as underground protection works from stress waves. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1996-1944 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06e82341b54cad7d25b1f2cc7f086e42Test http://europepmc.org/articles/PMC7696292Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....06e82341b54cad7d25b1f2cc7f086e42 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19961944 |
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