文档介绍：辽宁工程技术大学学报模板
第31卷第6期辽宁工程技术大学学报(自然科学版) 2012年12月文章编号:1008-0562(2012)06-0875-06
纳米混凝土声发射Kaiser效应的试验与数值模拟
王海波1,谢志龙2
(1. 华东交大理工学院土建分院,江西南昌 330100;2. 南昌大学建筑工程学院,江西南昌 330031)
摘要:为研究纳米材料的微观结构对混凝土宏观力学性能的影响,采用声发射试验和数值模拟相结合的方法,:纳米混凝土具有明显的Kaiser效应,,由于受到纳米SiO2微观作用的影响,纳米混凝土在前3次加载过程中,声发射能量高、幅值大、,由于承载能力得到提高,,.
关键词:纳米混凝土;声发射;Kaiser效应;RFPA;数值模拟;纳米SiO2;试验;损伤
中图分类号:O 文献标志码:A
Numerical simulation and experiment on acoustic emission
Kaiser effect of Nano-concrete
WANG Haibo1, XIE Zhilong2
(1. Civil Engineering and Architecture Branch, Institute of Technology, East China Jiao Tong University, Nanchang 330100, China; 2. School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China) Abstract: To study the influence of nano material microscopic structure on the macro-mechanical properties of concrete, using AE test and numerical simulation methods, the AE characteristic of Nano-concrete under cyclic loading was investigated. The results show that the Nano-concrete has Kaiser effect, however, it occurs in a certain stress level range. Compared with ordinary concrete, the Nano-concrete has higher AE energy, larger AE amplitude and stronger AE activity during the first 3 loading processes due to the micro influence of Nano-SiO2. Nevertheless, in the 4th loading, the AE energy cumulative curve of Nano-concrete is relatively flat because of the improvement of the bearing capacity of Nano-concrete. The numerical simulation results of RFPA and experimental results are consistent. The stress diagram and AE figure are able to image the characteristics of the specimen crack propagation process and the rupture position, which helps an in-depth understanding on the AE characteristics of Nano-concrete during its damage process.
Key words: Nano-concrete; acoustic emission; Kaiser effect; RFPA; nu