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基于连续-非连续单元法的三维脆性颗粒冲击破碎特性分析
Analysis of 3D brittle particle impact crushing characteristics based on CDEM
投稿时间:2022-01-07  修订日期:2022-01-07
DOI:
中文关键词:  连续-非连续单元法  颗粒冲击破碎  破碎块度  数值模拟  断裂能
英文关键词:The continuum-discontinuum element method  Particle impact crushing  Fragmentation size  Numerical simulation  Fracture energy
基金项目:国家重点研发计划项目(2018YFC1505504.
作者单位邮编
刘新明 中国科学院力学研究所 100190
冯春 中国科学院力学研究所 100190
林钦栋 西安近代化学研究所 
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中文摘要:
      通过在连续-非连续单元法(CDEM)中引入考虑应变率效应的断裂能本构以及能量统计算法,实现了球体冲击破碎过程中损伤破裂程度及能量演化的定量分析。结果表明,冲击破碎过程分为接触蓄能阶段、损伤破裂阶段和碎块飞散阶段。首先,颗粒的部分动能转化为单元弹性变形能,随后这部分变形能和动能迅速转化为了摩擦消耗、阻尼消耗及弹簧断裂能,破碎基本完全后碎块继续飞散。不同冲击速度下,颗粒分别出现了反弹、开裂、破碎和粉碎的现象。颗粒的d50由3.19mm减小至0.84mm;颗粒的破裂度从0.84%增大至48.04%,损伤度从3.18%增大至61.19%,平均拉伸损伤因子由0.02变化至0.59,平均剪切损伤因子由0.01变化至0.55。以上结论可为脆性材料冲击破碎工艺的优化设计提供依据。
英文摘要:
      By introducing the fracture energy structure considering the strain rate effect and the energy statistical 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 particle 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 consumption, damping consumption and spring fracture energy. After the crushing is basically complete, the fragments continue to disperse. At different impact velocities, the particles rebound, crack, break and smash. D50 of particles decreased from 3.19 mm to 0.84 mm; the particle rupture degree increased from 0.84 % to 48.04 %, the damage degree increased from 3.18 % to 61.19 %, the average tensile damage factor changed from 0.02 to 0.59, and the average shear damage factor changed from 0.01 to 0.55. The above conclusions can provide a basis for the optimization design of impact crushing process of brittle materials.
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