Experimental study on the coefficient of restitution of grain against block interfaces for natural and engineered materials

The coefficient of restitution (COR) is an important input parameter in the numerical simulation granular flows, as it governs travel distance, lateral spreading, and design barriers. In this study, a new custom-built micromechanical impact loading apparatus presented along with experiments on engineered natural materials. COR energy loss various grains base block combinations are studied, including fairly regular-shaped Leighton Buzzard sand (LBS) soil granite or rubber blocks, apart from use materials for (chrome steel balls, glass balls) blocks (stainless steel, brass). repeatability was checked by impacting chrome balls stainless block. all test combinations, higher lower values found (ranging between 0.75 0.95) 0.37 0.44) respectively. For tested grain–block were observed impacts low composite Young’s modulus. However, within narrow range surface roughness interfaces no particular trend values. Compared to greater scatter grains. This due variation elastic morphological characteristics among individual LBS