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Fig. 8. Low-velocity impact test of D4 sandwich with three different kinetic energy, 25 J, 32.5 J, and 40 J, (a–c) force-time response and (d–f) montage of photographs at maximum displacement.
FROM:
Sartip Zangana (1), Jayantha Epaarachchi (1), Wahid Ferdous (2), Jinsong Leng (3) and Peter Schubel (2)
(1) University of Southern Queensland, Centre for Future Materials (CFM), School of Mechanical and Electrical Engineering, Toowoomba, QLD, 4350, Australia
(2) University of Southern Queensland, Centre for Future Materials (CFM), Toowoomba, QLD, 4350, Australia
(3) Centre of Composite Materials and Structures, Harbin Institute of Technology, Harbin, China
“Behaviour of continuous fibre composite sandwich core under low-velocity impact”, Thin-Walled Structures, Article 107157, Vol. 158, January 2021, https://doi.org/10.1016/j.tws.2020.107157
ABSTRACT: This article describes an experimental study of the impact behaviour of a novel composite corrugated core sandwich structure under low-velocity impact. Influences of geometric parameters of the novel sandwich core, such as thickness, height, and short span length were studied. Four different configurations of composite corrugated core sandwich structures were prepared and tested. The impact events were monitored using a high-speed camera and measured by an impact force transducer and accelerometer attached to the impactor. The results revealed that the increase of core thickness improved impact capacity while the increase of core height decreased sandwich strength by increasing elastic deformation. The damage status of the novel composite core sandwich was simulated and insight into the damage mechanism was gained with finite element analysis. This study proposes an improved numerical model by incorporating the effect of the impactor head which was able to predict the impact capacity to within 10% variation of the experimental results. The results also identified that the multi-cell composite corrugated core increased the impact capacity due to the continuity of the fibres between adjacent cells. Moreover, the trapezoidal composite corrugated sandwich core showed higher specific strength compared to traditional honeycomb, truss and foam cores.
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