TY - CONF
T1 - Determination of a shape and size independent material modulus for honeycomb structures in additive manufacturing
AU - Le, Thao
AU - Bhate, Dhruv
AU - Parsey, John M.
AU - Hsu, Keng H.
N1 - Funding Information:
This effort was performed through the National Center for Defense Manufacturing and Machining under the America Makes Program entitled “A Non-Empirical Predictive Model for Additively Manufactured Lattice Structures” and is based on research sponsored by the Air Force Research Laboratory under agreement number FA8650-12-2-7230. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon.
PY - 2020
Y1 - 2020
N2 - Most prior work on modeling cellular structures either assumes a continuum model or homogenizes “effective” cell behavior. The challenge with the former is that bulk properties do not always represent behavior at the scale of the cellular member, while homogenization results in models that are shape specific and offer little insight into practical design matters like transitions between shapes, partial cells or skin junction effects. This paper demonstrates the strong dependence of measured properties on the size of the honeycomb specimen used for experimental purposes and develops a methodology to extract a material modulus in the presence of this dependence for three different honeycomb shapes. The results in this paper show that the extracted modulus for each shape converges as the number of cells in the specimen increases and further, that the converging values of the material moduli derived from the three shapes are within 10% of each other.
AB - Most prior work on modeling cellular structures either assumes a continuum model or homogenizes “effective” cell behavior. The challenge with the former is that bulk properties do not always represent behavior at the scale of the cellular member, while homogenization results in models that are shape specific and offer little insight into practical design matters like transitions between shapes, partial cells or skin junction effects. This paper demonstrates the strong dependence of measured properties on the size of the honeycomb specimen used for experimental purposes and develops a methodology to extract a material modulus in the presence of this dependence for three different honeycomb shapes. The results in this paper show that the extracted modulus for each shape converges as the number of cells in the specimen increases and further, that the converging values of the material moduli derived from the three shapes are within 10% of each other.
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M3 - Paper
AN - SCOPUS:85085007194
SP - 2148
EP - 2169
T2 - 28th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2017
Y2 - 7 August 2017 through 9 August 2017
ER -