Chapter 18
Investigation of Flexural Progressive
Damage of Three-Dimensional Braided
Composites by Acoustic Emission
and Micro-CT
Wei Zhou, Peng-Fei Zhang, Ran Liu, Ya-Ping Liu, Zhi-Yuan Wei,
and Sa Yang
Abstract Three-dimensional four-direction is the most widely used braided structure in the field of three-dimensional braiding. For purpose of improving the mechanical properties of this kind of braiding in a certain direction, three-dimensional
five-directional braid has been developed. The aim of this work is to investigate
the progressive damage and failure behavior of three-dimensional five-directional
braided composites subjected to three-point bending. To comprehensively analyzing
the damage process of 3D five-directional braided composites, a variety of nondestructive testing methods is used, involving acoustic emission, digital image correlation and X-ray micro-computed tomography. Among them, the acoustic emission
response behavior of the composite damage process is monitored in real time, and the
displacement and strain field at different stages are calculated by the digital image
correlation method. More importantly, the microscopic damage morphology of the
materials is visualized by using X-ray, and the analysis results are supplemented and
verified. Through analyzing the experimental results, the obvious Kaiser effect is
observed, and the acoustic emission signals are concentrated in the middle and late
stages of loading and directly related to the cumulative degree of damage. In addition, the position of the strain and displacement set from the deformation measurement is consistent with the damage evolution from the micro-computed tomography
observation.
W. Zhou (B) · P.-F. Zhang · Z.-Y. Wei · S. Yang
School of Quality and Technical Supervision, Hebei University, Baoding 071002, China
e-mail: zhouwei@hbu.edu.cn; zhouweihy@126.com
R. Liu
China Special Equipment Inspection and Research Institute, Beijing 100013, China
Y.-P. Liu
Hebei Province Special Equipment Supervision and Inspection Institute Baoding Branch, Baoding
071002, China
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_18
199
Investigation of Flexural Progressive
Damage of Three-Dimensional Braided
Composites by Acoustic Emission
and Micro-CT
Wei Zhou, Peng-Fei Zhang, Ran Liu, Ya-Ping Liu, Zhi-Yuan Wei,
and Sa Yang
Abstract Three-dimensional four-direction is the most widely used braided structure in the field of three-dimensional braiding. For purpose of improving the mechanical properties of this kind of braiding in a certain direction, three-dimensional
five-directional braid has been developed. The aim of this work is to investigate
the progressive damage and failure behavior of three-dimensional five-directional
braided composites subjected to three-point bending. To comprehensively analyzing
the damage process of 3D five-directional braided composites, a variety of nondestructive testing methods is used, involving acoustic emission, digital image correlation and X-ray micro-computed tomography. Among them, the acoustic emission
response behavior of the composite damage process is monitored in real time, and the
displacement and strain field at different stages are calculated by the digital image
correlation method. More importantly, the microscopic damage morphology of the
materials is visualized by using X-ray, and the analysis results are supplemented and
verified. Through analyzing the experimental results, the obvious Kaiser effect is
observed, and the acoustic emission signals are concentrated in the middle and late
stages of loading and directly related to the cumulative degree of damage. In addition, the position of the strain and displacement set from the deformation measurement is consistent with the damage evolution from the micro-computed tomography
observation.
W. Zhou (B) · P.-F. Zhang · Z.-Y. Wei · S. Yang
School of Quality and Technical Supervision, Hebei University, Baoding 071002, China
e-mail: zhouwei@hbu.edu.cn; zhouweihy@126.com
R. Liu
China Special Equipment Inspection and Research Institute, Beijing 100013, China
Y.-P. Liu
Hebei Province Special Equipment Supervision and Inspection Institute Baoding Branch, Baoding
071002, China
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_18
199