Damage characteristics and energy dissipation of carbon fiber reinforced high strength concrete under multiple impact loads

doi:10.19936/j.cnki.2096-8000.20221228.003

Abstract

Abstract: In order to study the safety of carbon fiber reinforced high strength concrete under multiple impact loads. The longitudinal wave velocity, damage factor, peak stress and energy dissipation of specimens with different carbon fiber contents (0%, 0.15%, 0.3%, 0.45% and 0.6%) under different impact times (1, 2, 3 and 4) were studied by using a separated Hopkinson pressure bar device with a diameter of 74 mm and a non-metallic ultrasonic testing device. Combined with scanning electron microscope scanning (SEM), the internal microstructure of the specimen under different impact times was observed, and the relationship between the mechanical properties of the specimen and the content of carbon fiber and impact times was analyzed. The results show that the addition of carbon fiber can increase the integrity of the specimen, reduce the internal cracks and increase the longitudinal wave velocity. The first impact will "compact" the internal cracks of the specimen, and the wave velocity of the specimen will increase. With the increase of impact times, the damage degree of the specimen increases and the wave velocity decreases. The addition of carbon fiber can effectively increase the peak stress of the specimen, and the effect is the best when the content is 0.45%. The impact load will cause compaction and damage to the specimen, and the peak stress of the specimen first increases slightly and then decreases greatly. The energy time history change of the specimen under impact load is mainly divided into three stages. The energy dissipation rate of the specimen is the highest when the fiber content is 0.3%. Multiple impact will cause damage accumulation to the specimen, and its energy consumption density will be significantly reduced. SEM test results show that the existence of carbon fiber can effectively reduce the internal crack propagation and the number of cracks under impact load, and the changes of microstructure and macro mechanical properties are consistent.

Key words: impact load, carbon fiber content, impact times, longitudinal wave velocity, damage factor, energy dissipation, scanning electron microscope

CLC Number:

TB332

MA Xue-si, XU Li, ZHANG Qiang. Damage characteristics and energy dissipation of carbon fiber reinforced high strength concrete under multiple impact loads[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(12): 24-30.

References

[1] 彭小芹, 马铭彬, 吴芳. 土木工程材料[M]. 3版. 重庆: 重庆大学出版社, 2013: 76.
[2] 李敏, 孟庆腾, 陈凤山. C60混凝土的动态抗压性能试验及数值模拟[J]. 混凝土, 2017(3): 46-48.
[3] 周南南. 高温对高强高性能混凝土抗压强度影响机理研究[J]. 新型建筑材料, 2021, 48(4): 14-17, 21.
[4] 张黎飞, 郑愚, 于国友, 等. 高韧性纤维水泥基薄板弯曲韧性[J]. 混凝土, 2018(1): 96-101.
[5] CHUNG D D L. Cement reinforced with short carbon fibers:a multifunctional material[J]. Composites Part B: Engineering, 2000, 31(6-7): 511-526.
[6] 吴伟, 冯虎. 碳纤维混凝土动态力学特性试验研究[J]. 复合材料科学与工程, 2021(10): 13-18.
[7] 尹俊红, 周继阳, 赫中营. 碳纤维混凝土单轴循环受压应力应变曲线试验研究[J]. 建筑科学, 2021, 37(5): 113-121.
[8] 翟毅, 许金余, 王鹏辉. 纤维混凝土动态压缩力学性能的SHPB试验研究[J]. 西安建筑科技大学学报(自然科学版), 2009, 41(1): 141-148.
[9] 周继阳. 碳纤维混凝土力学性能及在盾构管片中的应用研究[D]. 开封: 河南大学, 2020.
[10] 刘娟红, 周昱程, 杨海涛, 等. 冲击荷载作用下的井壁混凝土能量与损伤特性[J]. 煤炭学报, 2019, 44(10): 2983-2989.
[11] 李夕兵, 王世鸣, 宫凤强, 等. 不同龄期混凝土多次冲击损伤特性试验研究[J]. 岩石力学与工程学报, 2012, 31(12): 2465-2472.
[12] ZHENG Y S, HEINZ K, THOMAS F. Hysteresis energy-based failure indicators for concrete and brittle rocks under the condition of fatigue loading[J]. International Journal of Fatigue, 2018, 114: 298-310.
[13] 侯帅, 王文年, 曾宪森, 等. 聚甲醛纤维增强混凝土劈裂抗拉强度的研究[J]. 武汉纺织大学学报, 2013, 26(3): 39-42.
[14] 杨富花, 石宵爽, 栾晨晨, 等. 聚甲醛纤维增强地聚物再生混凝土的力学性能研究[J]. 新型建筑材料, 2021, 48(5): 52-56, 70.
[15] 薛维培, 刘晓媛, 姚直书, 等. 不同损伤源对玄武岩纤维增强混凝土孔隙结构变化特征的影响[J]. 复合材料学报, 2020, 37(9): 2285-2293.
[16] 吕雪莹, 申永刚, 钱凯君, 等. 整形器在软材料霍普金森杆中的应用[J].中国科技信息,2016(8):93-95.
[17] 田威, 余宸, 王肖辉, 等. 3D打印裂隙岩体动态力学性能及能量耗散规律初探[J/OL]. 岩石力学与工程学报: 1-11[2021-11-29]. https://doi.org/10.13722/j.cnki.jrme.2021.0584.
[18] 孙旭曙, 李建林, 王乐华, 等. 节理岩体超声测试及单轴压缩试验研究[J]. 岩土力学, 2014, 35(12): 3473-3478, 3488.
[19] 胡宏彪. 超声波法检测混凝土缺陷的实验分析[J]. 江苏建筑职业技术学院学报, 2015, 15(2): 17-20.
[20] 陈峰宾, 许斌, 焦华喆, 等. 玄武岩纤维混凝土纤维分布及孔隙结构表征[J]. 中国矿业大学学报, 2021, 50(2): 273-280.
[21] 朱长军. 碳纤维增强混凝土的受力破坏及其断面分形分析[D]. 沈阳: 沈阳建筑大学, 2013.
[22] 王志坤, 许金余, 范建设, 等. 高温下钢纤维混凝土吸能特性研究[J]. 混凝土, 2014(2): 14-17.
[23] 王梦想, 汪海波, 宗琦. 冲击荷载作用下煤矿泥岩能量耗散试验研究[J]. 煤炭学报, 2019, 44(6): 1716-1725.
[24] 梁宁慧, 杨鹏, 刘新荣, 等. 高应变率下多尺寸聚丙烯纤维混凝土动态压缩力学性能研究[J]. 材料导报, 2018, 32(2): 288-294.