TY - GEN

T1 - Micromechanical modeling of two-dimensional periodic cellular materials

AU - Alzebdeh, K.

AU - Al-Shabibi, A.

AU - Pervez, T.

PY - 2013

Y1 - 2013

N2 - The mechanical behavior of 2-D periodic cellular materials is investigated using a continuum-based modeling approach. Two micromechanical models are developed on the basis of representative unit cell concept in which skeleton of cellular material is modeled as elastic beams. The ANSYS finite element code is used to solve the beam model of skeleton. Elastic moduli of square and triangular networks comprising the microstructure of the cellular material are calculated based on an equivalent continuum model. This is achieved by equating the stored energy in skeleton of a unit cell to the strain energy of the equivalent continuum under a set of prescribed boundary conditions. A proper displacement-controlled (essential) boundary condition generates a uniform strain field in both models which corresponds to calculation of one elastic modulus at a time. Then, effective Young's modulus and Poisson's ratio of continuum are extracted from the calculated elastic moduli. The dependence of effective elastic constants on relative density and thickness to length ratio of the microstructure is investigated. Furthermore, the in-plane behavior of cellular solids in compression is explored with the help of current modeling. The proposed models may contribute to optimal designs of a new class of materials with tailored geometry and material properties which could be useful in a broad range of structural applications.

AB - The mechanical behavior of 2-D periodic cellular materials is investigated using a continuum-based modeling approach. Two micromechanical models are developed on the basis of representative unit cell concept in which skeleton of cellular material is modeled as elastic beams. The ANSYS finite element code is used to solve the beam model of skeleton. Elastic moduli of square and triangular networks comprising the microstructure of the cellular material are calculated based on an equivalent continuum model. This is achieved by equating the stored energy in skeleton of a unit cell to the strain energy of the equivalent continuum under a set of prescribed boundary conditions. A proper displacement-controlled (essential) boundary condition generates a uniform strain field in both models which corresponds to calculation of one elastic modulus at a time. Then, effective Young's modulus and Poisson's ratio of continuum are extracted from the calculated elastic moduli. The dependence of effective elastic constants on relative density and thickness to length ratio of the microstructure is investigated. Furthermore, the in-plane behavior of cellular solids in compression is explored with the help of current modeling. The proposed models may contribute to optimal designs of a new class of materials with tailored geometry and material properties which could be useful in a broad range of structural applications.

KW - Cellular material

KW - Continuum model

KW - Effective elastic moduli

KW - Finite element analysis

KW - Unit cell

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U2 - 10.1115/IMECE2013-64190

DO - 10.1115/IMECE2013-64190

M3 - Conference contribution

AN - SCOPUS:84903450631

SN - 9780791856383

T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)

BT - Mechanics of Solids, Structures and Fluids

PB - American Society of Mechanical Engineers (ASME)

T2 - ASME 2013 International Mechanical Engineering Congress and Exposition, IMECE 2013

Y2 - 15 November 2013 through 21 November 2013

ER -