Drop-weight impact test on an integrated composite sandwich panel of aluminum honeycomb and epoxy resin
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In this paper, drop-weight impact test was carried out on an integrated composite sandwich panel of aluminum honeycomb and epoxy resin to investigate its failure modes and typical force–displacement curves, and the influences of different parameters on plateau phase duration time, nominal stress, and energy absorption capacity were analyzed. Dynamic impact test results indicated that this integrated composite sandwich panel had good integrality, stability, and energy absorption capacity. The force–displacement curves of flat-bottom impactor and gradual impactor respectively had seven and five phases. Impact velocity, impactor shape, and specimen thickness had significant influences on the plateau phase duration time, nominal stress, and energy absorption capacity of the composite panel. It can be found from our results that the mechanical properties of the integrated composite sandwich panel were superior to those of traditional sandwich panels.
I. INTRODUCTION
In recent years, aluminum honeycomb materials have attracted a great deal of attention owing to their outstanding advantages such as high energy absorption capacity, good thermal insulation, light weight, and high strength.1 These advantages of aluminum honeycomb materials mainly depend on the continuous multiwall arrangement of the honeycomb. The hexagonal network structure can distract the external force from all directions, and thus makes its resistance to impact load much higher than other structures.2 Under dynamic impact load, it can bear large plastic deformation to absorb high energy.3 Owing to this characteristic, aluminum honeycomb sandwich panel with aluminum honeycomb core has been identified as one potential energy absorption protective material that can be widely used in different industry fields, such as aerospace, automotive, architecture, shipping, transportation, and so on.4–8 Therefore, it is very necessary to gain a better knowledge of its mechanical properties especially the dynamic mechanical property so as to get a correct understanding of the applications of this material in different areas. The mechanical behaviors of aluminum honeycomb under dynamic load have been extensively investigated by both experimental and numerical studies. Through the quasistatic and dynamic impact tests, Ashab et al.9 tested three types of hexagonal aluminum honeycomb under five different velocities. They presented the displacement, Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2017.182
impact force, plateau stress, and energy absorption of aluminum honeycomb based on experimental results, and analyzed the loading plane, loading velocity, and loading angle. Yasui et al.10 carried out the dynamic impact test on multi-layer honeycomb panels, and the results indicated that the behaviors of these materials were influenced sensitively by dynamic impact velocity and material mechanical properties. Ude et al.11 investigated the impact toughness of light weight sandwich panels with reinforce
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