Detailed analysis of SE density in this study shows a clear trend: as the unloading rate increases, stress concentration inside the rock becomes more significant, leading to more internal friction between cracks, and consequently, a greater density of dissipated SE.
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Effect of true triaxial principal stress unloading rate on strain energy density of sandstone.
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The sentences
Studying the impacts of varying unloading speeds on their strain energy (SE) density is highly significant for predicting rock stability.