基于离散元方法的氦冷陶瓷增殖包层球床压缩性能研究

Study on compression performance of helium cooled ceramic breeder blanket pebble bed based on discrete element method

基于开源离散元软件LIGGGHTS-PUBLIC对不同破碎率的Li_(4)SiO_(4)球床进行了单轴压缩试验模拟以研究球床的压缩性能。计算结果表明,在相同的球床应变下,球床应力随着破碎颗粒数量的增大而减小。球床破碎率和恢复系数共同影响球床的整体强度。在球床应变整体较小时,球床平均填充率随球床应变的增大呈线性增大。球床平均配位数随球床应变的增大而增大,并随球床破碎率的增大而减小。

Based on the open source discrete element software LIGGGHTS-PUBLIC,the uniaxial compression tests were simulated on Li_(4)SiO_(4) pebble bed with different crushing ratio to study the compression performance of the pebble bed.The results show that under the same pebble bed strain,the pebble bed stress decreases with the increase of broken particles.The crushing ratio and the restitution coefficient affect the overall strength of the pebble bed together.When the overall strain of the pebble bed is small,the average packing fraction of the pebble bed increases linearly with the increase of the strain of the pebble bed.The average coordination number of the pebble bed increases with the increase of the strain of the pebble bed,and decreases with the increase of the crushing ratio of the pebble bed.