Thermal Damage Impact on Negative Poisson's Ratio of Granite Under Brazilian Tensile Loading

IF 3.1 2区 材料科学 Q2 ENGINEERING, MECHANICAL
Tianzuo Wang, Jisha Wang, Fei Xue, Xiaolin Huang, Zhongqin Lin, Zhu Liang
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引用次数: 0

Abstract

This study investigates the effects of thermal damage on the tensile behavior of granite during Brazilian splitting tests, focusing on the negative Poisson's ratio (NPR) effect. Using digital image correlation and acoustic emission techniques, the research reveals that increasing thermal damage from 25°C to 800°C reduces granite tensile strength by up to 85.7% and induces a brittle-to-ductile transition. The NPR effect emerges, intensifies, and subsequently disappears as temperature increases, significantly altering stress distribution and deformation patterns. Local contraction zones created by the NPR effect can lead to overestimation of tensile strength in thermally damaged rock. Acoustic emission monitoring demonstrates a strong correlation between the NPR effect and microcrack development. These findings advance the understanding of rock mechanical behavior under thermal damage and provide practical insights for tensile strength evaluation in high-temperature geological settings, such as deep underground energy development and nuclear waste disposal.

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来源期刊
CiteScore
6.30
自引率
18.90%
发文量
256
审稿时长
4 months
期刊介绍: Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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