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Lightweight Metal Cellular Structures Fabricated via 3D Printing of Sand Cast Molds
Author(s) -
Snelling Dean,
Li Qian,
Meisel Nicolas,
Williams Christopher B.,
Batra Romesh C.,
Druschitz Alan P.
Publication year - 2015
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201400524
Subject(s) - materials science , fabrication , truss , composite material , 3d printing , specific modulus , welding , structural material , stiffness , finite element method , adhesive , structural engineering , composite number , medicine , alternative medicine , pathology , layer (electronics) , engineering
Cellular structures offer high specific strength and can offer high specific stiffness, good impact absorption, and thermal and acoustic insulation. A major challenge in fabricating cellular structures is joining various components. It is well known that joints, either welded or bolted or bonded with an adhesive, serve as stress concentrators. Here, we overcome this shortcoming by the use of metal casting into 3D printed sand molds for fabricating cellular structures and sandwich panels. Furthermore, the use of 3D printing allows for the fabrication of sand molds without the need for a pattern, and thus enables the creation of cellular structures with designed mesostructure from a bevy of metal alloys. We use the finite element method to numerically analyze the energy absorption capabilities of an octet truss cellular structure created with the proposed manufacturing process and that of a solid block of the same material and area density as the cellular structure. In the numerical simulations, mechanical properties collected through experimental quasi‐static compression testing are employed. It is found that indeed the cellular structure absorbs considerably more impact energy over that absorbed by a solid structure of the same weight.