%0 Journal Article %A HU Wei-hua %A PENG Gang %A HUANG Shi-chao %A TIAN Wei %T Dynamic Damage Features of Concrete Based on Acoustic Emission Technology %D 2015 %R 10.3969/j.issn.1001-5485.2015.02.025 %J Journal of Yangtze River Scientific Research Institute %P 123-127,132 %V 32 %N 2 %X

In order to study the dynamic damage features and damage evolution regularity of concrete, we carried out uniaxial compression test on concrete under different loading rates (10-5/s,10-4/s, 7.5×10-3/s) and collected the real-time acoustic emission signals. By analysing the relationship between acoustic emission parameters and stress-strain, we obtained the plastic deformation and damage features of concrete under cyclic loading and unloading. Results reveal that the damage concentrates in the early and middle stages of the cyclic loading and unloading process.The damage intensifies with the increase of loading time and cycle numbers. Damage variable also increases along with the increase of accumulated residual plastic strain. Moreover, when loading rate increases, the energy release before the peak gets larger and damage path becomes shorter. When the difference between loading rates gets larger, the damage path difference becomes larger, but the start point and end point of damage curves overlap.

%U http://ckyyb.crsri.cn/EN/10.3969/j.issn.1001-5485.2015.02.025