Numerically investigating the crushing of sandstone by a tooth hob
作者机构：Key Laboratory of Ministry of Education for Geomechanics and Embankment EngineeringHohai UniversityNanjing210098China Geotechnical Research InstituteHohai UniversityNanjing210098China Institute of Tunnel and Underground EngineeringHohai UniversityNanjing210098China
出 版 物：《结构与土木工程前沿:英文版》 (Frontiers of Structural and Civil Engineering)
年 卷 期：2023年第17卷第6期
页 面：964-979页
核心收录：
学科分类：08[工学] 080104[工学-工程力学] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）]
基 金：This study was sponsored by the National Natural Science Foundation of China(Grant No.51609071) Fundamental Research Funds for the Central Universities(Nos.B200202087 and B200204032).
主 题：sandstone tooth hob crushing process reaction force numerical simulation
摘 要：To investigate the mechanical process that occurs between rocks and tooth hobs,the crushing of sandstone with a tooth hob was simulated using reconstructed multi-mineral mesoscopic numerical models of various grain-sized sandstone samples.When a piece of sandstone is crushed by the tooth of a hob rolling at a constant speed,the resultant reaction forces of the sandstone on the tooth first hinder and then contribute to the rolling of the hob.The absolute value of the longitudinal reaction force is significantly higher than that of the lateral reaction force.Because the tooth was subjected to reaction forces from the sandstone,forces and moments were applied to the hob in order to keep the hob rolling.The applied forces were equal in value and opposite in direction to the reaction forces of the sandstone on the tooth.Three typical curves of the work done by the applied forces and moment were obtained,and the contribution of the applied lateral force and moment to the total work done for crushing sandstones was variable;however,no work was done by the applied longitudinal force.Moreover,the applied longitudinal force and total work were positively correlated with the strength of sandstone samples.The total work,applied forces,and moment increased with the maximum penetration depth of the tooth in the sandstone.
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