Medical Journal of the Chinese People's Armed Police Forces
Dynamic Damage Features of Concrete Based on Acoustic Emission Technology
HU Wei-hua,PENG Gang,HUANG Shi-chao,TIAN Wei
Journal of Changjiang River Scientific Research Institute ›› 2015, Vol. 32 ›› Issue (2) : 123-127,132.
Dynamic Damage Features of Concrete Based on Acoustic Emission Technology
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.
concrete / acoustic emission / dynamic damage / cyclic loading and unloading / uniaxial compression test on concrete
[1] 尹双增. 断裂·损伤理论及应用. 北京: 清华大学出版社,1992. (YIN Shuang-zeng. The Fracture and Damage Theory and Application . Beijing: Tsinghua University Press, 1992. (in Chinese))
[2] 李庆斌,张楚汉,王光纶. 单轴状态下混凝土的动力损伤本构模型. 水利学报, 1994, (12): 55-60. (LI Qing-bin, ZHANG Chu-han, WANG Guang-guan. Damage Constitutive Model for Concrete under Uniaxial State Power . Journal of Hydraulic Engineering, 1994, (12): 55-60. (in Chinese))
[3] 李 杰,吴建营. 混凝土弹塑性损伤本构模型研究Ⅰ:基本公式. 土木工程学报, 2005, 38(9): 15-20. (LI Jie, WU Jian-ying. Concrete Elasto-plastic Damage Constitutive Model I: Basic Formula . China Civil Engineering Journal, 2005, 38 (9): 15-20. (in Chinese))
[4] 吴建营,李 杰. 混凝土弹塑性损伤本构模型研究Ⅱ:数值计算和试验验证. 土木工程学报, 2005, 38(9): 21-27. (WU Jian-ying, LI Jie. Study of Concrete Elasto-plastic Damage Constitutive Model II: Numerical Calculation and Experimental Verification . China Civil Engineering Journal, 2005, 38 (9): 21-27. (in Chinese))
[5] SUZUKI T, OBTSU M. Quantitative Damage Evaluation of Structural Concrete by a Compression Test Based on AE Rate Process Analysis Core Test of Concrete. Construction and Building Materials,2004,18(3):197-202.
[6] CARPINTERI A, LACIDOGNA G, PUGNO N. Structural Damage Diagnosis and Life-time Assessment by Acoustic Emission Monitoring. Engineering Fracture Mechanics, 2006, 74(1/2): 273-289.
[7] MATTHEWS J R.Acoustic Emission (1st Edition) . New York: Gordon and Breach Science Publishers, 1983.
[8] GROSSE C U,OHTSU M.Acoustic Emission Testing . Berlin: Springer, 2008. 朱宏平,徐文胜,陈晓强,等.利用声发射信号与速率过程理论对混凝土损伤进行定量评估.工程力学,2008,25(1):186-191.(ZHU Hong-ping, XU Wen-sheng, CHEN Xiao-qiang, et al. The Use of Acoustic Emission Signal and Rate Process Theory to Quantitatively Evaluate the Damage of Concrete . Journal of Engineering Mechanics, 2008, 25 (1): 186-191. (in Chinese))
[9] 陈炳瑞,冯夏庭,肖亚勋,等.深埋隧洞TBM施工过程围岩损伤演化声发射试验.岩石力学与工程学报,2010,29(8):1562-1569. (CHEN Bing-rui, FENG Xia-ting, XIAO Ya-xun, et al. The Damage Evolution of Acoustic Emission Testing of Deep Buried Tunnel TBM Construction Process of Surrounding Rock . Journal of Rock Mechanics and Engineering,2010,29(8):1562-1569. (in Chinese))
/
| 〈 |
|
〉 |
