Comparative study on energy efficiency in drop weight impact tests under different crushing conditions
CAO Xingjian
PAN Yongtai
ZHANG Yongqiang
LI Shaozhuo
YIN Fangxi
YU Chao
ZHAO Huanshuai
Abstract：The form of the crushing body and the loading rate significantly influence the material crushing process,making the selection of an appropriate crushing method essential for energy-effi-cient comminution and particle size control.In this study,drop weight impact tests were con-ducted by varying the penetration angle and drop height to investigate the effects of different crushing conditions on the fracture morphology,particle size characteristics,and energy effi-ciency during the fragmentation of quasi-brittle materials.The results show that as the penetra-tion angle increases,the failure mode of the specimens transitions from tensile failure to compres-sive failure.The fracture fractal dimension of the crushed products increases and reaches a maxi-mum within the penetration angle range below 120°,then decreases within the 120°—180° range.The fractal dimension increases with rising mass-specific energy,though the rate of increase di-minishes within the range of 0.167 4-0.227 7 kW·h/t.The average energy efficiency of mate-rial fragmentation under different penetration angles ranges from 1.68%to 2.86%,increasing uniformly with the penetration angle and stabilizing within the 120°—180° range.This study aims to enrich comminution theory and provide a reference for predicting crushed products and design-ing crushing bodies.
Keywords：mining engineeringcrushingdrop weight impact testenergy efficiency
Publication Date：2026-03-31
Online Publishing Date：2026-04-08(First online date of this platform, not the publication date of the document)
Pages：11( 526-536 )