高压物理学报2025，Vol.39Issue(2)：50-62,13.DOI:10.11858/gywlxb.20240861
不同数量碳纤维布条带约束煤样的轴压蠕变特性细观模拟研究
Microscopic Simulation Study on Uniaxial Compressive Creep Characteristics of Coal Samples Constrained by Different Numbers of Carbon Fiber Reinforced Polymer Strips
摘要
Abstract
To investigate the influence of carbon fiber reinforced polymer(CFRP)strip with different number on the creep mechanical properties of coal samples under axial compression,a coupled numerical simulation using PFC3D and FLAC3D software was conducted,and a hybrid contact model combining the Burger's model and the Linearpbond model was established.The reliability of the numerical model was validated based on laboratory uniaxial compressive creep tests of unconstrained coal and coal samples constrained with 6 strips of CFRP sheet.The mechanical properties and energy evolution of coal samples constrained with 2 to 7 strips of CFRP sheet under uniaxial compression were studied by numerical simulations.The results show that as the number of strips increases,the initial axial strain of the coal sample tends to increase overall,with a significant increase in axial strain during the accelerated creep stage,and the maximum internal contact force in the hybrid contact model tends to increase overall.The ratio of the contact quantity of Burger's model to that of Linearpbond model is about 1∶9,and this ratio in the numerical simulation model could reflect the creep mechanical properties of coal samples.Increasing the number of CFRP strips restricts radial deformation,increases the number of shear micro-cracks,causes more severe shear damage within the coal sample,and the failure mode of the coal sample changes from tensile failure to shear failure.As the number of strips increases,the total energy,elastic energy,and dissipated energy all increase,and the change in elastic energy is similar to the change in total energy before the coal sample experiencing creep instability.关键词
碳纤维增强复合材料/条带数/单轴压缩蠕变/伯格斯模型/PFC3D-FLAC3D耦合Key words
carbon fiber reinforced polymer/strip number/uniaxial compressive creep/Burger's model/PFC3D-FLAC3D coupling分类
建筑与水利引用本文复制引用
李庆文,高翔,谭正林,张帅帅,徐康康,才诗婷..不同数量碳纤维布条带约束煤样的轴压蠕变特性细观模拟研究[J].高压物理学报,2025,39(2):50-62,13.基金项目
辽宁省教育厅基本科研面上项目(JYTMS20230866) （JYTMS20230866）
辽宁省自然科学基金面上项目(2023-MS-298) （2023-MS-298）
辽宁省博士科研启动基金(2019-BS-120) （2019-BS-120）
辽宁省自然科学基金指导项目(20180550297) （20180550297）
