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Detailed amount of particle breakage in multi-sized coral sands under impact loading

Abstract In previous experimental studies, the detailed amount of particle breakage under impact loading cannot be obtained due to the coexistence of fragments and unbroken grains in multi-sized sands. In this study, a series of impact loading tests were carried out to three kinds of coral sands to explore the detailed particle breakage in multi-sized sand samples. Before impact loading tests, coral sands in different size groups were dyed in different colors, then mixed as multi-sized sand samples. After impact loading, particle image segmentation method was used to particle images to obtain the mass ratio of different color grains. Results show that the actual amount of particle breakage was found to be larger than the amount of relative particle breakage in most size ranges, and the “absolute particle breakage” w i satisfied logarithmic relationships with the input work. The breakage index B w of multi-sized sand samples, excluding the interference effect of the coexistence of fragments and unbroken grains, was a little larger than the breakage index B g and satisfied logarithmic relationships with the input work. This study could be useful in analyzing the particle breakage model and the constitutive model of granular materials.