混合型加载下钢纤维混凝土损伤过程的声发射参数分析

doi:10.12382/bgxb.2021.0468

摘要/Abstract

摘要： 结合声发射技术，开展Ⅰ-Ⅱ混合型载荷作用下钢纤维混凝土带预制中心裂纹巴西圆盘(BDCN)破坏特性的实验研究，得到试件破坏过程中声发射特征参数的演化过程。运用机器学习算法，对声发射参数进行分析，揭示钢纤维混凝土的损伤机理。结果表明：依据累积声发射强度曲线及时间-载荷曲线的变化，BDCN试件破坏全过程可以划分为3个阶段：前两个阶段损伤的主要来源是混凝土基体中微裂纹的起裂和大量微裂纹汇聚扩展，最后一个阶段声发射源的主要机制则是钢纤维的脱粘及拉拔。运用高斯混合聚类算法,可以将损伤源划分为拉伸型裂纹和剪切型裂纹。其中，拉伸型裂纹主导了每个阶段的损伤，而剪切型裂纹对损伤起到了促进作用。使用支持向量机求得的两类裂纹的分界线方程表明，拉伸型裂纹与剪切型裂纹的分界线并不总是一条过原点的直线。

关键词: 钢纤维混凝土, 损伤机理, 声发射, 高斯混合聚类

Abstract: Using the acoustic emission (AE) technique, a series of Brazilian disk tests with a central notch (BDCN) under mixed loading are conducted to investigate the fracture mechanism of steel fiber reinforced concrete (SFRC). The evolution of the AE parameters during the fracture process is analyzed. The results indicate that the damage process consists of three stages based on the characteristics of the cumulative signal strength and load versus time relationships. The damage in the first stage is caused by the microcrack initiation, and then the coalescence and extension of microcracks. AE signals captured during the third stage are caused by the debonding and extension of steel fibers. By employing the machine learning algorithm and analyzing the AE parameters, the damage mechanism of SFRC is revealed. Using Gaussian mixture models, it is possible to classify damage sources as tensile cracks or shear cracks. Tensile cracks dominate the damage process, while shear cracks contribute to it. From the support vector machine, it is evident that the boundaries between tensile and shear cracks are not always straight lines passing through the origin.

Key words: steelfiberreinforcedconcrete, solidmechanics, acousticemission, Gaussianmixturemodels

中图分类号:

TB303.1

宋水舟，任会兰，宁建国. 混合型加载下钢纤维混凝土损伤过程的声发射参数分析[J]. 兵工学报, 2022, 43(8): 1881-1891.

SONG Shuizhou, REN Huilan, NING Jianguo. Acoustic Emission Parameters in the Damage Process of Steel Fiber Reinforced Concrete under Mixed Loading[J]. Acta Armamentarii, 2022, 43(8): 1881-1891.

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