混凝土单轴压缩过程中损伤演化与声发射分析

为了研究混凝土单轴压缩状态下的损伤演化过程,利用声发射设备采集试样破坏过程的声发射数据,基于声发射信号建立声发射能量表述的损伤本构方程,对损伤程度进行量化表述,提出了损伤因子在启裂强度和损伤强度的取值区间.基于连续介质损伤力学,对微裂纹的发育过程和声发射能量数综合分析.结果表明,理论应力-应变曲线与试验曲线吻合较好,混凝土单轴压缩过程各阶段吻合度较高,混凝土单轴压缩损伤本构模型具有一定的合理性.

Analysis for damage evolution and acoustic emission in uniaxial compression process of concrete

In order to study the damage evolution process of concrete under uniaxial compression state, the acoustic emission data in the sample destruction process were collected with the acoustic emission equipment, and the damage constitutive equation represented by the acoustic emission energy was established, according to the acoustic emission signal. The damage degree was quantitatively presented. The value interval of damage factor between the cracking and the damage strength was proposed. Based on the damage mechanics of continuum media, a comprehensive analysis for the development process of microcrack and the number of acoustic emission energies was conducted. The results show that the theoretical stress-strain curve agrees well with the experimental curves, and the fitting degree at each stage in the uniaxial compression process of concrete is higher. The constitutive model for the uniaxial compression damage of concrete is rational to a considerable degree.