摘要
为了研究动载作用下玻璃纤维增强复合材料(glass fiber reinforced polymer, GFRP)管砂浆的能量耗散情况,通过应用分离式霍普金森压杆实验装置对4种不同壁厚的GFRP管砂浆试块进行动态劈裂拉伸试验,研究其在4种应变率下的能量耗散规律。结果表明,GFRP管砂浆试块的入射能、反射能均与应变率呈正相关,随着应变率的增大呈上升趋势,壁厚为3 mm和4 mm时,吸收能提升的幅度较大,壁厚为2 mm和5 mm时,吸收能提升的幅度较小。GFRP管砂浆试样的反射能、透射能、吸收能与入射能呈正相关。GFRP管砂浆试块透射能随GFRP相对壁厚的增加经历两个阶段的变化,透射能曲线先是线性增加后是增长趋于稳定保持不变。GFRP管砂浆试块耗能密度与入射能具有良好的线性关系,5 mm壁厚试块耗能密度最大但其增长幅度最小,3 mm和4 mm壁厚试块耗能密度增长幅度最大,2 mm试块耗能密度增长略高于5 mm试块。试件沿着加载轴线呈对称式破坏,应变率越大破坏程度越大,GFRP管壁厚越大破坏越明显。
In order to study the energy dissipation of glass fiber reinforced polymer(GFRP)tube mortar under dynamic loading,dy-namic splitting and tensile tests of GFRP tube mortar with four different wall thicknesses were carried out by using split Hopkinson pres-sure bar test device,and the energy dissipation law of GFRP tube mortar under four strain rates was studied.The results show that the incident energy and reflected energy of GFRP tube mortar test block are positively correlated with the strain rate,and show a rising trend with the increase of strain rate.When the wall thicknesses are 3 mm and 4 mm,the absorption energy increases greatly,while when the wall thicknesses are 2 mm and 5 mm,the absorption energy increases slightly.The reflected energy,transmitted energy and absorbed energy of GFRP tube mortar are positively correlated with incident energy.The transmission energy of GFRP tube mortar test block changes in two stages with the increase of GFRP relative wall thickness.The transmission energy curve increases linearly at first and then tends to be stable.There is a good linear relationship between the energy consumption density of GFRP tube mortar test block and incident energy.The energy consumption density of 5 mm wall thickness test block is the largest but its growth range is the smallest.The energy consumption density of 3 mm and 4 mm wall thickness test block is the largest,and the energy consumption density of 2 mm test block is slightly higher than that of 5 mm test block.The specimen exhibits symmetric failure along the loading axis.The greater the strain rate,the greater the failure degree,and the greater the wall thickness of GFRP tube,the more obvious the failure degree.
作者
刘雅弟
汪海波
李娜
吕闹
魏梦杰
LIU Ya-di;WANG Hai-bo;LI Na;LÜNao;WEI Meng-jie(School of Civil Engineering and Architectural,Anhui University of Science and Technology,Huainan 232001,China)
出处
《科学技术与工程》
北大核心
2022年第29期13004-13012,共9页
Science Technology and Engineering
基金
安徽省自然科学基金(2008085ME163)
安徽理工大学研究生创新基金(2021CX2029)。
关键词
GFRP管砂浆
冲击
壁厚
应变率
能量耗散
GFRP tube mortar
impact
wall thickness
strain rate
energy dissipation
