Journal
POLYMER COMPOSITES
Volume 43, Issue 5, Pages 2864-2877Publisher
WILEY
DOI: 10.1002/pc.26582
Keywords
3D printing; acoustic emission; composites; flexural failure; micro-computed tomography
Categories
Funding
- National Natural Science Foundation of China [12172117]
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This study investigates the flexural damage and evolution behavior of 3D printed continuous fiber-reinforced composites using acoustic emission technology. The results show that matrix buckling and interface failure are the main failure modes and Kevlar fiber-reinforced composites have more serious damage. The combination of complementary detection methods is beneficial for the nondestructive evaluation and health monitoring of 3D printed composite materials.
It is necessary to investigate the flexural damage and evolution behavior of 3D printed continuous fiber-reinforced composites. In this paper, acoustic emission technology (AE) is used to monitor the bending damage of 3D printed Kevlar fiber (KF) and glass fiber (GF)-reinforced composites in real time, and gray relational analysis (GRA) and k-means are utilized for clustering analysis of AE signals. Subsequently, micro-computed tomography (micro-CT) is employed to identify the internal damage degree. For 3D printed specimens, matrix buckling and interface failure are the main failure modes, and the number of matrix and interface damage is more than that of fiber damage, and the surface of compression side (specimen's top side) is more serious than that of the back side. KF-reinforced composites have poor delamination resistance and more serious damage than that of GF. The average maximum stress of GF and KF-reinforced specimens is 56.37 and 42.15 MPa, and the average bending modulus is 1576.42 and 1395.36 MPa, respectively. The combination of complementary detection methods is beneficial to the nondestructive evaluation and health monitoring of 3D printed composite materials.
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