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Published in: Rock Mechanics and Rock Engineering 4/2020

04-12-2019 | Original Paper

The Influence of Temperature and High-Speed Heating on Tensile Strength of Granite and the Application of Digital Image Correlation on Tensile Failure Processes

Authors: Fei Wang, Heinz Konietzky, Thomas Frühwirt, Yawei Li, Yajie Dai

Published in: Rock Mechanics and Rock Engineering | Issue 4/2020

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Abstract

Thermal induced cracks and the tensile strength variation of Eibenstock granite subjected to high-speed heating have been studied through lab testing. The Digital Image Correlation (DIC) technique was used for analysing the tensile behaviour of granite at high-speed heating rate and different temperatures. For samples heated to 800 °C with heating rates of 200 °C/min and 300 °C/min, thermal-induced macrocracks become visible to the naked eyes, while no obvious macrocracks are observed on samples heated according to ISO 834 curve. Compared to the influence of temperature, the selected heating rates only have a negligible impact on tensile strength and axial displacement. The DIC analysis shows the crack initiation and progressive crack propagation before the main crack is formed at failure. Compared to the samples heated up to 400 °C, the samples heated up to 800 °C show less brittle fracture behaviour, and the tensile strength is greatly reduced. The final failure patterns prove that different heating scenarios lead to different microcrack structures and consequently influence the failure mode at the macroscopic scale.

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Metadata
Title
The Influence of Temperature and High-Speed Heating on Tensile Strength of Granite and the Application of Digital Image Correlation on Tensile Failure Processes
Authors
Fei Wang
Heinz Konietzky
Thomas Frühwirt
Yawei Li
Yajie Dai
Publication date
04-12-2019
Publisher
Springer Vienna
Published in
Rock Mechanics and Rock Engineering / Issue 4/2020
Print ISSN: 0723-2632
Electronic ISSN: 1434-453X
DOI
https://doi.org/10.1007/s00603-019-02022-0

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