Fatigue Damage Characteristics and Metrics for Brittle Rocks under Different Cyclic Loading Patterns
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Key Points
This work aims to understand the evolution of fatigue damage in brittle rocks under different cyclic loading patterns.
Conducted cyclic loading–unloading, multistage constant-amplitude, and constant-amplitude-cyclic tests.
Quantified fatigue damage using modulus method, residual strain method, energy method, and a new residual deformation–energy method.
Performed comparative analysis of damage indicators under varied loading conditions.
Secant modulus initially increases, followed by degradation; cumulative residual strain develops in three stages.
Dissipated energy shows accelerated growth before failure, indicating the importance of energy metrics.
Energy method (EM) provides stable damage characterization while residual deformation–energy method (REM) captures damage evolution more effectively under specific loading.
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Implication
Randomized trial evaluates fatigue damage in brittle rocks, suggesting effective metrics for engineering applications.