Research on the macro-and meso-mechanical properties of frozen sand mold based on Hertz-Mindlin with Bonding model  

作　　者：Jianpei Shi Zhongde Shan Haoqin Yang 

机构地区：[1]College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [3]College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

出　　处：《Particuology》2024年第5期176-191,共16页颗粒学报（英文版）

基　　金：supported by the National Key R&D Program of China(grant No.2021YFB3401200);the 2021 Industrial Technology Basic Public Service Platform Project of Ministry of Industry and Information Technology(grant No.2021-0163-1-2).

摘　　要：In this study,macro-and meso-mechanical properties of frozen sand molds were discussed based on the Hertz-Mindlin with Bonding(HMB)model.Plackett-Burman,steepest ascent,and central composite designs were utilized to propose a parameter calibration methodology.The effects of mesoscopic parameter variations on the compressive strength and average gradient of stress-strain were investigated through response surface method analysis.Results showed that the relative error between the simulated and measured repose angle is 3.1%under calibrated intrinsic contact parameters.The compressive strength and average stress-strain gradient primarily depend on the normal and shear stiffness per unit area,as well as the particle size and porosity of the silica sand.Furthermore,taking load-displacement curves of three frozen sand molds with different geometric characteristics as the target value,the reliability and effectiveness of the frozen sand mold HMB model were verified through uniaxial compression tests and discrete element simulations.

关 键 词：Frozen sand mold Hertz-Mindlin with Bonding model Uniaxial compression test Discrete element method Mechanical properties 

分 类 号：O3[理学—力学]