Identification of Damage Modes of Concrete under Compressive Loading Based on Wavelet Transform

doi:10.3969/j.issn.1000-1093.2017.09.011

Abstract

Abstract: In order to acquire the physical information about the evolution of microcraks in concrete in real time, three typical types of acoustic emission (AE) signals are identified by the wavelet transform of experimentally collected AE signals.The whole compressive fracture process of concrete is divided into four stages,i.e., microvoid compressive closure, crack initiation, crack growth and crack coalescence, on the basis of the event density fluctuation of AE signals andthe fracture theory of brittle materials. Based on the inverse proportional relationship between the frequency of AE signal and crack size, and the distribution characteristics of the three types of AE signals at four fracture stages, the AE signals are associated with crack initiation, crack growth (or microvoid compressive closure) and crack coalescence, respectively. The experimental results show that the rise times and frequencies of AE signals caused by crack initiation, crack growth (or microvoid compressive closure) and crack coalescence increase in turns and decrease gradually, respectively, which conform to the strain energy release theory. Key

Key words: solidmechanics, concrete, acousticemission, wavelettransform, damagemechanism

CLC Number:

TB303.2

WANG Zong-lian, REN Hui-lan, NING Jian-guo. Identification of Damage Modes of Concrete under Compressive Loading Based on Wavelet Transform[J]. Acta Armamentarii, 2017, 38(9): 1745-1753.

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第38卷
第9期2017 年9月兵工学报ACTA
ARMAMENTARIIVol.38No.9Sep.2017

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