玻璃纤维砂浆管动态劈裂拉伸性能试验研究  

Experimental Study on Dynamic Splitting Tensile Properties of Glass Fiber Mortar Tubes

作　　者：李娜 汪海波[1] 魏善斌[1] 王梦想[1] LI Na;WANG Hai-bo;WEI Shan-bin;WANG Meng-xiang(School of Civil Engineering and Architectural,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,淮南232001

出　　处：《科学技术与工程》2021年第17期7308-7312,共5页Science Technology and Engineering

基　　金：安徽省自然科学基金(2008085ME163);安徽省博士后科研基金(2018B282)。

摘　　要：为了研究壁厚对玻璃纤维砂浆管动态劈裂拉伸性能的影响,利用直径为74 mm的分离式霍普金森压杆系统开展玻璃纤维砂浆管动态冲击试验,通过改变冲击气压得到不同加载速率下的玻璃纤维砂浆管动态特性变化规律,同时设置壁厚为2、3、4、5 mm并进行该变量下的纵向分析。试验结果表明:在玻璃纤维管的约束下,动态应力-应变曲线出现“双峰”现象,且第二个应力峰值高于第一个应力峰值;通过分离式霍普金森压杆(split Hopkinson pressure bar,SHPB)试验发现,随着壁厚的增加,动态强度-冲击速度拟合直线斜率减小,应变率效应减弱;在破坏形态方面,玻璃纤维砂浆管在0.4~0.5 MPa冲击气压下只出现一条贯穿裂缝,随着冲击气压的上升,开始出现受载面的局部破裂,但试件依然呈现完整的外形。In order to study the influence of wall thickness on the dynamic splitting tensile properties of glass fiber mortar tubes,a 74 mm diameter split Hopkinson pressure bar(SHPB)system was used to carry out a dynamic impact test.The dynamic characteristics of glass fiber mortar tubes under different loading rates were obtained by changing the impact pressure.At the same time,the wall thickness of 2,3,4 and 5 mm was set,and the longitudinal analysis under the variable was carried out.The results show that under the confinement of the glass fiber mortar tubes,the dynamic stress-strain curve appears“double peak”,and the second peak is higher than the first peak.Through the SHPB test,it is found that with the increase of wall thickness,the slope of dynamic strength impact velocity fitting line decreases,and the strain rate effect weakens.In the aspect of failure mode,there is only one through crack under the impact pressure of 0.4~0.5 MPa.With the increase of impact pressure,the local fracture of the loading surface begins to appear,but the specimen still presents complete shape.

关 键 词：玻璃纤维砂浆管 霍普金森压杆 动态劈裂 应力-应变曲线 

分 类 号：TU528[建筑科学—建筑技术科学]