摘要
为研究冲击荷载作用下不同掺量氧化石墨烯(GO)改性珊瑚砂浆的破坏模式及形成机制,采用∅50 mm分离式霍普金森压杆(SHPB)开展了3种应变率下的冲击压缩试验,通过扫描电镜得到了微观特征变化。结果表明:与普通珊瑚砂浆整体破坏模式不同,改性珊瑚砂浆由于GO的模板效应减少了砂浆内部的初始缺陷,使其破坏模式由局部剥落破坏、留芯破坏逐渐向整体破坏过渡,同应变率水平下平均粒径更大;与普通珊瑚砂浆类似,改性珊瑚砂浆碎块分形特征明显且分形维数与应变率正相关,同时动态抗压强度、冲击韧性和能耗值与分形维数正相关;GO掺量超过0.03%时会抑制珊瑚砂浆的水化反应,造成分形维数随GO掺量增加先下降后上升。
To study the damage mode and formation mechanism of coral mortar modified with different dosages of graphene oxide(GO)under impact loading,impact compression tests at three strain rates were carried out using a∅50 mm split Hopkinson press bar(SHPB),and the microscopic characteristic changes were obtained by scanning electron microscopy.The results show that:different from the overall damage mode of ordinary coral mortar,modified coral mortar reduces the initial defects inside the mortar due to the template effect of GO,so that its damage mode is gradually transitioned to the overall damage from the local spalling damage and core-retention damage,and the average grain size is larger under the same strain rate level;similar to ordinary coral mortar,the fractal characteristics of modified coral mortar fragments are obvious and the fractal dimension is positively correlated with the strain rate,while the dynamic compressing strength,impact toughness,and impact strength of modified coral mortar are also positively correlated with the strain rate.Dynamic compressing strength,impact toughness and energy consumption are positively correlated with the fractal dimension;GO doping more than 0.03%will inhibit the hydration reaction of coral mortar,resulting in the fractal dimension decreasing and then increasing with the increase of GO doping.
作者
陈宾
袁洋
胡杰铭
张召
张涛
CHEN Bin;YUAN Yang;HU Jieming;ZHANG Zhao;ZHANG Tao(School of Civil Engineering,Xiangtan University,Xiangtan 411105,China;School of Mechanics and Materials and Engineering Science,Hohai university,Nanjing 210098,China;School of Geoscience and Information Physics,Central South University,Changsha 410083,China)
出处
《兵器装备工程学报》
CAS
CSCD
北大核心
2024年第10期25-33,共9页
Journal of Ordnance Equipment Engineering
基金
国家自然科学基金项目(42207227)
湖南省自然科学基金项目(2022JJ40586)
国家建设高水平大学公派研究生项目(202306710072)。
作者简介
陈宾(1977-)男,博士,教授,硕士生导师,E-mail:403021235@qq.com;通信作者:胡杰铭(1996-)男,博士研究生,E-mail:hujiemingxut@163.com。
