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Research of Dynamic Tensile Properties of Five Rocks under Three Loading Modes Based on SHPB Device
Diyuan Li1, Jinyin Ma1, Quanqi Zhu1
1School of Resources and Safety Engineering, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|December 11, 2022
Summary
Investigating dynamic tensile strength in rocks reveals loading modes significantly impact results. Mode-III loading aligns best with Brazilian test theory, while Mode-II loading is inconsistent.
Area of Science:
- Geotechnical Engineering
- Rock Mechanics
- Materials Science
Background:
- The dynamic Brazilian test is widely used to determine rock tensile strength.
- Calculating dynamic tensile strength using this method is often problematic.
- Understanding the influence of loading methods on rock damage mechanisms is crucial.
Purpose of the Study:
- To investigate the effects of three loading methods on rock specimen damage in dynamic Brazilian tests.
- To analyze how different loading modes influence the loading rate and dynamic tensile strength.
- To characterize failure patterns and rupture mechanisms under dynamic impact.
Main Methods:
- Selected five different rock types for dynamic Brazilian tests.
- Employed a constant incident energy approach.
- Utilized high-speed photography and digital image correlation (DIC) to capture and analyze specimen rupture processes.
- Quantified displacement and strain field evolution.
Main Results:
- Loading modes significantly affected loading rate and dynamic tensile strength.
- Mode-III loading yielded the highest loading rate and tensile strength, followed by Mode-I, then Mode-II.
- DIC analysis revealed four typical failure patterns and two rupture characteristics.
- Loading mode dictated crack initiation position.
Conclusions:
- Mode-III loading demonstrated the highest consistency with Brazilian test theoretical principles.
- Mode-II loading was found to violate the fundamental principles of the Brazilian test.
- The choice of loading mode critically influences the interpretation of dynamic tensile strength results in rocks.
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