Numerical Analysis of Ice Rubble with a Freeze-Bond Model in Dilated Polyhedral Discrete Element Method  

作　　者：Biyao Zhai Lu Liu Shunying Ji 

机构地区：[1]State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian,116023,China

出　　处：《Computer Modeling in Engineering & Sciences》2022年第1期1-22,共22页工程与科学中的计算机建模（英文）

基　　金：the National Key Research and Devel-opment Program of China(Grant No.2018YFA0605902);the National Natural Science Foun-dation of China(Grant Nos.20212024,11872136);China Postdoctoral Science Foundation(Grant No.2020M670746).

摘　　要：Freezing in ice rubble is a common phenomenon in cold regions,which can consolidate loose blocks and change their mechanical properties.To model the cohesive effect in frozen ice rubble,and to describe the fragmentation behavior with a large external forces exerted,a freeze-bond model based on the dilated polyhedral discrete element method(DEM)is proposed.Herein,imaginary bonding is initialized at the contact points to transmit forces and moments,and the initiation of the damage is detected using the hybrid fracture model.The model is validated through the qualitative agreement between the simulation results and the analytical solution of two bonding particles.To study the effect of freeze-bond on the floating ice rubble,punch-through tests were simulated on the ice rubble under freezing and nonfreezing conditions.The deformation and resistance of the ice rubble are investigated during indenter penetration.The influence of the internal friction coefficient on the strength of the ice rubble is determined.The results indicate that the proposed model can properly describe the consolidated ice rubble,and the freeze-bond effect is of great significance to the ice rubble properties.

关 键 词：Discrete element method dilated polyhedron bond-fracture model ice rubble freeze bonding punch-through tests 

分 类 号：TG1[金属学及工艺—金属学]