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Finite Element Analysis of Foldcores for Sandwich Structures

Nabiyouni, Ehsan
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1372865986

Abstract Details

2013, Master of Science in Mechanical Engineering, University of Toledo, College of Engineering.
Sandwich structures are used in many different industries. A sandwich panel is made of a light weight core sandwiched amongst two thin skins. The combination of light weight and desired mechanical properties makes sandwich panels ideal for aerospace and automotive industries. The core is typically made of cellular geometries or foams with a high second moment of inertia and thus a high stiffness in bending. Foldcore geometries provide some advantages, such as the less complex and faster manufacturing process, to overcome issues of regular cores used in sandwich panels. These benefits have made this type of core a preferred geometry in the sandwich structures. The most popular pattern used as a foldcore is called Chevron which can be changed to Modified Chevron as well. In this study another foldcore, called Waterbomb is proposed. The main objective of this study was to investigate feasibility of using auxetic foldcores for sandwich structures, and to develop a method whereby the effective mechanical properties of folded patterns, as possible candidates for sandwich structures, can be modeled using finite element analysis. These auxetic foldcores are of interest because they offer curved sandwich panels which can be used in manufacturing dome shape structures in a continuous process without any need to attach several flat sandwich panels. The study was done based on the properties of Aramet® papers manufactured by Aramid, Ltd [42]. The mechanical properties needed for the linear elastic analysis were Young’s modulus, density and Poisson’s ratio. Values of density were provided by the manufacturer and a value of 0.3 was reasonable to be used as the Poisson’s ratio for Aramid. The compressive modulus of each paper type was experimentally found. A total of 225 simulations were done, and the results showed different behaviors of the geometries under the compressive loads in z, x and y directions as well as shear loads in x and y directions. Comparisons based on geometry and loading were performed, and presented in tables and figures, thus, one can pick a geometry which is more suitable for their applications.
Lesley Berhan (Committee Chair)
Efstratios Nikolaidis (Committee Member)
Sarit Bhaduri (Committee Member)
124 p.
Mechanical Engineering

Recommended Citations

Citations

  • Nabiyouni, E. (2013). Finite Element Analysis of Foldcores for Sandwich Structures [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1372865986

    APA Style (7th edition)

  • Nabiyouni, Ehsan. Finite Element Analysis of Foldcores for Sandwich Structures. 2013. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1372865986.

    MLA Style (8th edition)

  • Nabiyouni, Ehsan. "Finite Element Analysis of Foldcores for Sandwich Structures." Master's thesis, University of Toledo, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1372865986

    Chicago Manual of Style (17th edition)

toledo1372865986
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© 2013, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.