文献类型：期刊文献

英文题名：Thermal Damage Impact on Negative Poisson's Ratio of Granite Under Brazilian Tensile Loading

作者：Wang, Tianzuo[1]; Wang, Jisha[1]; Xue, Fei[1]; Huang, Xiaolin[2]; Lin, Zhongqin[3]; Liang, Zhu[4]

机构：[1] Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, School of Civil Engineering, Shaoxing University, Shaoxing, 312000, China; [2] Department of Civil Engineering, School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an, 710049, China; [3] College of Civil Engineering, Fuzhou University, Fujian, Fuzhou, 350116, China; [4] Guangzhou Urban Planning & Design Survey Research Institute, Guangzhou, 510060, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240252733)

语种：英文

外文关键词：Acoustic emission testing - Fracture - Fracture mechanics - Image correlation - Poisson ratio - Tensile strength

外文摘要：Natural rocks generally possess a positive Poisson’s ratio, which entails lateral expansion under compression. However, rocks with thermal damage may display an abnormal negative Poisson’s ratio (NPR) in certain interior regions. This paper employs Digital Image Correlation (DIC) and Acoustic Emission (AE) techniques to analyze the fracture mechanisms of thermal-damaged granite and the impact of the NPR effect. The findings demonstrate a progressive decline in granite's tensile strength with rising treatment temperatures, coupled with a shift in failure mode from brittleness to ductility. Untreated granite under Brazilian splitting tension loading undergoes lateral tensile deformation perpendicular to the loading direction, ultimately resulting in tensile failure. Thermal damage promotes the growth of shear cracks. In specimens with mild and moderate thermal damage, abnormal contraction deformation zones emerge on both sides of the loading point, indicating the NPR effect. However, this effect dissipates as the load increases. With a further increase in treatment temperature, the NPR effect ceases to occur. This suggests that the NPR effect is temperature-dependent and only appears within a certain temperature range. Additionally, the NPR effect restricts lateral deformation in the vicinity of the compression stress region. As a result, the indirect tensile strength of thermal-damaged specimens is enhanced to a certain extent. ? 2024, The Authors. All rights reserved.