【摘要】 为了寻求混凝土材料声发射过程与断裂演化之间的关系，从实验入手，首先给出了声发射过程关联分维函数 的概念，并通过实验，证明了声发射过程分形特征的存在。然后，通过混凝土试块的三点弯曲实验，分析了材料断 裂过程中声发射关联分维数的变化规律。进而确定了混凝土试块在临界断裂时的分形特征识别模式。研究结果表 明，混凝土材料的声发射过程不仅具有明显的分形特征，而且在临界状态下，各声发射分形特征参数都表现出一定 的异常“模式”，这种识别模式可以作为材料出现临界断裂的识别特征。更多还原

【Abstract】 In order to obtain the relationship between the acoustic emission process and fracture evolution of concrete material, the concept of relevant fractal function of acoustic emission process is given .The existence of fractal characteristics of acoustic emission process is proved through experiments firstly. Then. The variation tendency of relevant fractal dimensions in the fracture process of material is analyzed by three-point bending test of concrete specimen. The identification pattern of fractal characteristics for critical fracture is determined. The results show that the acoustic’ emission process of concrete material is of obvious fractal characteristics, and the different fractal characteristic parameters of acoustic emission in the critical state show some "identification pattern" which can be used to identify the characteristics of critical fracture.更多还原