高压物理学报2025，Vol.39Issue(4)：89-106,18.DOI:10.11858/gywlxb.20240931
基于颗粒流软件探究不同CFRP布层数对轴压煤圆柱能量演化的影响
Effect of CFRP Layers on the Energy Evolution of Axial Compressed Cylindrical Coal Based on Particle Flow Software
摘要
Abstract
To investigate the effects of different layers of carbon fiber reinforced plastic(CFRP)on the mechanical properties and energy evolution of axially compressed cylindrical coal samples,the finite difference method-discrete element method(FDM-DEM)coupled numerical simulation and laboratory uniaxial compression tests are combined in this paper.The test results show that both unconfined cylindrical coal samples and CFRP-confined samples undergo four stages in the stress-strain curve,namely,compression-tightness,elasticity,yielding,and post-peak.The CFRP-confined samples show obvious ductile damage in the yielding and post-peak stages,and their average peak stresses,peak strains,and elasticity modulus are about 2,2.5 and 1 times higher than those of the unconfined samples,respectively.Numerical simulations show that the peak strain and peak stress increased to 733％and 548％,respectively,with the increase in the number of CFRP layers.The elastic modulus does not increase monotonically,indicating that a balance between strength and stiffness is required when designing the CFRP layers.In addition,the increase of CFRP layers leads to the change of the damage mechanism from tensile damage to shear damage,indicating that it has a significant effect on the stress distribution and damage process of the cylindrical coal samples.The total and dissipated energy of the cylindrical coal samples significantly increased with the increase of CFRP layers,and the energy absorption efficiency reaches up to 10.51 times,showing a significant enhancement of their destabilization resistance.To quantify the confinement effect of CFRP sheets,the concept of"equivalent thickness"is introduced.It is found that the equivalent thickness increases nonlinearly with the number of CFRP layers,and at 6.78 layers,the equivalent thickness approaches infinity,which emphasizes the importance of CFRP sheet in improving the stability of cylindrical coal sample structure,and provides an important reference for future research.关键词
单轴压缩/碳纤维增强复合材料布/煤圆柱/有限差分-离散元法/能量演化/等效厚度Key words
uniaxial compression/carbon fiber reinforced plastic sheet/cylindrical coal/finite difference method-discrete element method/energy evolution/equivalent thickness分类
土木建筑引用本文复制引用
李庆文,潘创创,张学磊,钟宇奇,李玲,聂帆帆,李雯霞,徐梦娇..基于颗粒流软件探究不同CFRP布层数对轴压煤圆柱能量演化的影响[J].高压物理学报,2025,39(4):89-106,18.基金项目
辽宁省自然科学基金(2023-MS-298,20180550297) （2023-MS-298,20180550297）
辽宁省教育厅基本科研面上项目(JYTMS20230866) （JYTMS20230866）
辽宁省博士科研启动基金(2019-BS-120) （2019-BS-120）
