Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (8): 55-63.doi: 10.13475/j.fzxb.20180506809

• Textile Engineering • Previous Articles     Next Articles

Micro-deformation measurement and acoustic emission monitoring of three-dimensional braided composites under tensile loading

ZHANG Yannan, ZHOU Wei(), SHANG Yajing, ZHAO Wenzheng   

  1. College of Quality and Technical Supervision, Hebei University, Baoding, Hebei 071002, China
  • Received:2018-05-28 Revised:2019-05-12 Online:2019-08-15 Published:2019-08-16
  • Contact: ZHOU Wei E-mail:zhouweihy@126.com

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Abstract:

In order to monitor the deformation and damage behavior of three-dimensional four-directional braided composites under tensile loading, the acoustic emission (AE) and digital image correlation method complementary techniques were adopted, and the surface local micro-deformation information and the dynamic characteristics of internal damage sources of the composites were effectively acquired. The results show that the obvious tensile strain concentration can be observed at the interweaving area of the yarns while the tensile strain value of the composite increases up to about 0.45%. The propagation of the strain concentrations along the transverse and longitudinal braiding yarns are induced as the strain level increases gradually. At the same time, more AE signals are generated,and the stiffnesses of the composite specimens are decreased. As the strain level increases up to about 1.13%, the yarns carry the main loads, and the strain band in shape of zigzag are obtained in the surface of the composite specimens. Based on the K-means cluster analysis, AE amplitudes of the main damage modes such as matrix cracking, fiber/matrix debonding and fiber breakage are 40-60, 55-100 and 40-90 dB, respectively. With the increase of the weaving thickness, the proportion of the surface region in the skin-core structures of the composite specimen decreases, resulting in the decrease of tensile strength. The peak amplitude and frequency of AE signals have no significant change.

Key words: three-dimensional braided composite, acoustic emission monitoring, digital image correlation, damage evolution, tensile deformation

CLC Number: 

  • TB332

Fig.1

Tensile stress-strain curve of composite specimens"

Fig.2

Skin-core structure (a) and cross-section features (b) of composite specimens"

Fig.3

Changes of tensile stress, AE energy and accumulative hits of composite specimens with strain. (a) Stress, AE energy changes with strain of specimen A; (b) Stress, AE accumulative hits changes with strain of specimen A; (c) Stress,AE energy changes with strain of specimen B; (d) Stress, AE accumulative hits changes with strain of specimen B"

Fig.4

Surfacial strain fields of composites at different average strain levels. (a) Specimen A; (b) Specimen B"

Fig.5

Local morphology and critical failure status of composite material for surface displacement field. (a) Specimen A; (b) Specimen B"

Fig.6

DDB index varying with number of clusters"

Fig.7

Distributions of AE amplitude and frequency of clustering. (a) Specimen A; (b) Specimen B"

Fig.8

Distribution of AE amplitude of clustering. (a) Specimen A; (b) Specimen B"

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