Abstract
Interfacial instability in fractured concrete–sandstone composite is frequently encountered in practical engineering applications. This study investigated the impact of various fracture angles (0°, 30°, 45°, 60°, and 90°) on the fracture characteristics of concrete–sandstone composites under uniaxial compression. The real-time study of composite damage evolution during compression was conducted via the acoustic emission (AE) technique. By investigating the intrinsic relationship between entropy theory and AE parameters, the time-dependent evolution laws of AE counting entropy, AE energy entropy, and AE amplitude entropy are revealed. The frequency of the change in the AE entropy significantly increased prior to sample failure, serving as a reliable precursor signal for the failure of composites with varying fracture angles. Additionally, we have enhanced the crack classification methodology by incorporating elements from both the conventional RA/AF method and the dominant frequency approach. The cracks in the concrete–sandstone composite were classified via the Gaussian mixture model (GMM) clustering method. The proportions of tensile cracks with different crack angles were 80.4%, 18.8%, 68.9%, 65.2% and 71.8%, respectively. The experimental results show that the results of GMM clustering are in good agreement with the crack types of the samples, which indicates that the GMM clustering method has certain advantages and accuracy in the classification of crack types in composite materials.
Published Version
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