中南大学学报（自然科学版）2024，Vol.55Issue(9)：3416-3425,10.DOI:10.11817/j.issn.1672-7207.2024.09.016
岩石类材料直接拉伸破坏的FDEM数值模拟
Numerical simulation on direct tensile behavior of rock materials using FDEM
摘要
Abstract
The combined finite-discrete element method(FDEM)is widely employed in simulating rock crack propagation,especially in direct tensile simulations for parameter validation.However,simulation results are often influenced by the tensile rate and mesh size.Firstly,the fundamental principles of FDEM was elucidated.Secondly,a direct tensile numerical model was established to investigate the effects of tensile rate,mesh size,and height-to-diameter ratio on failure patterns and mechanical parameters.Finally,recommendations for the appropriate tensile rate and mesh size in direct tensile simulations were provided.The results show that as the tensile rate increases,the tensile strength,degree of failure and peak strain rate of the specimen also increase,while the average elastic modulus decreases.When tensile rates are lower(v≤0.01 m/s),the specimen develops only a single main tensile crack.When the tensile rates are higher,branch cracks appear on the upper side of the main tensile crack.The mesh size has a minimal impact on tensile strength,peak strain rate and average elastic modulus,but it significantly affects the failure pattern and degree of failure.With the increase of height-to-diameter ratio,the tensile strength,degree of failure and peak strain rate of the specimen increase,whereas the average elastic modulus shows an opposite trend.Moreover,the height-to-diameter ratio significantly influences the degree of failure.It is recommended to use a tensile rate of 0.01 m/s and limit the mesh size to within 1.5 mm in direct tensile simulations.关键词
直接拉伸模拟/有限元-离散元耦合算法/拉伸速率/网格尺寸/高径比Key words
direct tensile simulations/combined finite-discrete element method(FDEM)/tensile rate/mesh size/the specimen height-to-diameter ratio分类
建筑与水利引用本文复制引用
徐浩然,刘平,刘泉声,曹学,黄兴,罗鑫,邓鹏海..岩石类材料直接拉伸破坏的FDEM数值模拟[J].中南大学学报（自然科学版）,2024,55(9):3416-3425,10.基金项目
国家自然科学基金资助项目(U21A20153,52074258) （U21A20153,52074258）
湖北省重点研发计划项目(2021BCA133) （2021BCA133）
中铁十一局集团有限公司科技创新项目(22-AI-06)(Projects(U21A20153,52074258)supported by the National Natural Science Foundation of China （22-AI-06）
Project(2021BCA133)supported by the Key Research and Development Project of Hubei Province （2021BCA133）
Project(22-AI-06)supported by the Scientific and Technological Innovation Project of China Railway No.11 Construction Bureau Group Co.,Ltd) （22-AI-06）
