Experimental Study on Fatigue Characteristics of Granite under Uniaxial Stepwise Cyclic Loading.

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Bibliographic Details
Title:	Experimental Study on Fatigue Characteristics of Granite under Uniaxial Stepwise Cyclic Loading.
Authors:	Zhang, Qingwei¹ qingweibysj@126.com, Xiao, Jianqing² aynuxjq@126.com, Zhang, Shike³ shikezhang1021@126.com, Zhu, Yahui⁴ 3123347891@qq.com, Jia, Shuyan¹ 1821943541@qq.com
Source:	Engineering Letters. Mar2026, Vol. 34 Issue 3, p935-945. 11p.
Subjects:	Granite, Rock fatigue, Elastic modulus, Damping capacity, Cyclic loads, Acoustic emission testing, Fatigue cracks, Fatigue testing machines
Abstract:	This study systematically investigates the fatigue characteristics of granite under uniaxial stepwise cyclic loading using a rock fatigue testing machine and acoustic emission (AE) monitoring system. Four distinct loading schemes were implemented to analyze the evolution of fatigue parameters under both single-round and multi-round cyclic loading conditions. The experimental results reveal significant findings: (1) Under stepwise-decreasing single-round loading, dynamic elastic modulus and damping ratio exhibit progressive increases, while axial residual strain and dissipated energy density show corresponding decreases; (2) Conversely, stepwise-increasing single-round loading induces opposite trends in these parameters; (3) Multi-round loading follows similar evolutionary patterns to single-round cases, but with accelerated development rates for dynamic elastic modulus, residual strain, and dissipated energy density in successive rounds, whereas damping ratio demonstrates considerable data scattering; (4) Initial cycles under stepwise-decreasing loading conditions trigger abrupt parameter changes due to microstructural reorganization and damage accumulation; (5) Both linear and exponential models provide excellent fitting results for parameter characterization. These findings elucidate the path-dependent damage evolution mechanisms in granite, providing critical insights for predicting rock instability under complex cyclic loading scenarios. This research establishes a fundamental framework for assessing long-term stability in rock engineering applications. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

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Abstract:	This study systematically investigates the fatigue characteristics of granite under uniaxial stepwise cyclic loading using a rock fatigue testing machine and acoustic emission (AE) monitoring system. Four distinct loading schemes were implemented to analyze the evolution of fatigue parameters under both single-round and multi-round cyclic loading conditions. The experimental results reveal significant findings: (1) Under stepwise-decreasing single-round loading, dynamic elastic modulus and damping ratio exhibit progressive increases, while axial residual strain and dissipated energy density show corresponding decreases; (2) Conversely, stepwise-increasing single-round loading induces opposite trends in these parameters; (3) Multi-round loading follows similar evolutionary patterns to single-round cases, but with accelerated development rates for dynamic elastic modulus, residual strain, and dissipated energy density in successive rounds, whereas damping ratio demonstrates considerable data scattering; (4) Initial cycles under stepwise-decreasing loading conditions trigger abrupt parameter changes due to microstructural reorganization and damage accumulation; (5) Both linear and exponential models provide excellent fitting results for parameter characterization. These findings elucidate the path-dependent damage evolution mechanisms in granite, providing critical insights for predicting rock instability under complex cyclic loading scenarios. This research establishes a fundamental framework for assessing long-term stability in rock engineering applications. [ABSTRACT FROM AUTHOR]
ISSN:	1816093X