On the subject of 3D print infill, honeycomb structures usually are the most efficient, maximizing space for storing and minimizing necessary material. Research also shows how the honeytube, a novel kind of the honeycomb structure, also can provide 3D printed objects with excellent energy compression.
Recently, Rachel Harvey, Norman M. Wereley, PhD, as well as Min Mao, PhD, researchers within the University of Maryland‘s Composites Research Laboratory (CORE) inside Department of Aerospace Architectural, published a paper, referred to as “Development of 3D Paper Honeycombs for Crash Mitigation Software, ” that takes a closer take a look at the structure, and why its mechanical properties allow it to be “ideal for usage with crash mitigation, particularly with regard to helicopters and automobiles. ”
“Currently, when crushed by way of dynamic load, there is an impulse in force till you steady absorption – which may be detrimental in these crash mitigation applications. In this study, 3D printed honeycombs tend to be investigated for subsequent collapse efficiency with quasi-static and dynamic crush tests, ” the researchers wrote while in the abstract. “3D printing, rather then conventional manufacturing, allows for structural modifications in the honeycomb that influence it's force-displacement profile. Buckling initiators around the face and/or vertex connected with honeycombs should reduce initial peak stress and improve the strain at which densification, the point what place the stress once yet again increases, begins. ”
The goal was to design and fabricate 3D published honeycombs with both diamond-shaped and also circular buckling initiators, which they found will “decrease the initial peak stress of subjected to testing honeycombs. ” They used your uPrint SE system to help 3D print the honeycombs away from ABSplus filament, with 1 mm cell wall fullness, solid infill, and standing 30 mm tall.
Initial, in order to obtain the energy absorption and collapse efficiency, they tested the in-plane direction to the honeycomb structures.
Then, the 3D printed honeycombs have been tested on their out-of-plane properties with a 20, 000 lb MTS unit, “for comparison with Gibson and also Ashby equations and earlier data. ” They placed your honeycomb between two compression platens about the machine, “with a displacement connected with. 002in/sec,.02in/sec,.2in/sec, along with 2in/sec. ” They raised the actual platens 1″ above the samples prior to dynamic testing began, that's captured with a high-speed camera so they really could properly document the crush testing with the structures.
They found that the two types of buckling initiators undoubtedly influenced the 3D published honeycomb structures’ stress-strain curves – meaning their energy absorption was ideal. You can see this reflected within the tables below.
The researchers will continue their work with energy absorption of 3D IMAGES printed honeycomb structures.
They intend on testing honeycombs made with different materials, like foam plus aluminum, with buckling initiators; assessment different cell-designs, such for a flower petal; and conducting drop medical tests on 3D printed honeycombs having a high-speed camera. In addition, they will also keep testing the honeycombs they previously designed so that you can compare the efficiency of these designs with the new ones.
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