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Relationship Between Matrix Cracking and Delamination in CFRP Cross-Ply Laminates Subjected to Low Velocity Impact

1
School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
2
Beijing Aeronautical Science and Technology Research Institute, COMAC, Beijing 102211, China
3
Unmanned Aerial Vehicle Technology Institute, the Third Academy of CASIC, Beijing 100074, China
4
Tactical Weapons Division, China Academy of Launch Vehicle Technology, Beijing 100076, China
5
Beijing Center for Physical and Chemical Analysis, Beijing 100094, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(23), 3990; https://doi.org/10.3390/ma12233990
Received: 24 October 2019 / Revised: 24 November 2019 / Accepted: 28 November 2019 / Published: 2 December 2019
The effect of matrix cracking on the delamination morphology inside carbon fiber reinforced plastics (CFRP) laminates during low-velocity impact (LVI) is an open question. In this paper, the relationship between matrix cracking and delamination is studied by using cross-ply laminates. Several methods, including micrograph, C-scan, and visual inspection, were adopted to characterize the damage after LVI experiments. Based on the experimental results, finite element (FE) models were established to analyze the damage mechanisms. The matrix cracking was predicted by the extended finite element method (XFEM) and the Puck criteria, while the delamination was modeled by cohesive elements. It was revealed that the matrix crack in the bottom ply not only promoted the outward propagation of delamination but also contributed to the narrow delamination beneath the impact location. Multiple matrix cracks occurred in the middle ply. The ones close to the plate center initiated the delamination and prevented large-scale delamination beneath the impact location. For the cracks that were far away, no significant effect on delamination was found. In conclusion, the stress redistribution caused by the crack opening determines the delamination. View Full-Text
Keywords: low-velocity impact; matrix cracking; delamination; extended finite element method; cohesive element low-velocity impact; matrix cracking; delamination; extended finite element method; cohesive element
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Tan, R.; Xu, J.; Sun, W.; Liu, Z.; Guan, Z.; Guo, X. Relationship Between Matrix Cracking and Delamination in CFRP Cross-Ply Laminates Subjected to Low Velocity Impact. Materials 2019, 12, 3990.

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