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| Analysis of 3D brittle particle impact crushing characteristics based on CDEM |
| Received:February 18, 2022 Revised:April 15, 2022 |
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| DOI：10.7511/jslxCMGM202205 |
| KeyWord:the continuum-discontinuum element method particle impact crushing fragmentation size numerical simulation fracture energy |
| Author | Institution |
| 刘新明 |
中国科学院 力学研究所, 北京 ;中国科学院大学 工程科学学院, 北京 |
| 冯春 |
中国科学院 力学研究所, 北京 ;中国科学院大学 工程科学学院, 北京 |
| 林钦栋 |
西安近代化学研究所, 西安 |
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| Abstract: |
| By introducing the fracture energy mechanism considering the strain rate effect and the statistical energy algorithm into the continuum-discontinuum element method (CDEM),the quantitative analysis of the damage and fracture degree and energy evolution in the process of spherical impact crushing is realized.The results show that the impact crushing process is divided into contact energy storage stage,damage fracture stage and fragmentation stage.First of all,part of the kinetic energy of the particles is transformed into the elastic deformation energy of the element,and then this part of the deformation energy and kinetic energy is rapidly transformed into friction-induced energy dissipation consumption,damping dissipation and spring fracture energy.After the crushing is nearly complete,the fragments continue to disperse.At different impact velocities,the particles rebound,crack,break and smash.With the increase of impact velocity,the change ratio of D50 gradually slows down and the fragmentation gradually becomes stable.Secondly,the change ratio of fracture degree,damage degree and average damage factor increase and then slow down.The particle damage is mainly through tensile failure.The above conclusions can provide a basis for the optimization design of impact crushing process of brittle materials. |
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