混凝土声发射Felicity效应实验验证与理论分析  

Experimental Verification and Theoretical Analysis on Felicity Effect of Acoustic Emission in Concrete

作　　者：周振东[1] 

机构地区：[1]河南理工大学

出　　处：《中州煤炭》2008年第3期21-23,37,共4页Zhongzhou Coal

摘　　要：通过对混凝土试块的循环加载声发射实验,验证了混凝土材料声发射特征的Kaiser效应和Kaiser效应记忆应力能力的Felicity效应。基于统计损伤力学理论,对Felicity效应产生的原因进行了理论分析,建立了引入声发射参量的脆性材料循环加载条件下的本构模型,本构方程曲线与实验曲线有较好吻合。理论分析和实验结果表明:混凝土在循环加载中声发射特征有明显的Felicity效应,而且应力水平越高,Felicity效应越显著;应变FR值比应力FR值更接近于1。The experiment of acoustic emission （AE） on concrete specimens under uniaxial cyclic loading was conducted. The Kaiser effect of acoustic emission in concrete and the Felicity effect, which manifest the memorizing ability to the maximum previous stress level of Kaiser effect, were validated by the experiment. The mechanism of Felicity effect was analyzed based on the theory of statistical damage mechanics and a tentative AE factor constitutive model of brittle material under uniaxial cyclic loading was suggested. The curve of constitutive model is in good coincidence with the curve from the experiment. The experimental results showed that the Felicity effect became clearer along with the increasing of stress level. Each loading cycle would cause new damage inside the material, and the response of material to the new loading cycle is different from the previous cycle. This is the real mechanism of Felicity effect. There exists the close relation between the AE signals and the damage in material.

关 键 词：混凝土 循环加载 声发射 KAISER效应 Felicity效应 损伤 

分 类 号：TU528[建筑科学—建筑技术科学] TG115[金属学及工艺—物理冶金]