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Mechanical Response of Cellular Materials Used in Waste Shipping Containers

by A. K. Maji, Univ of New Mexico, Albuquerque, NM, USA,
S. Donald, Univ of New Mexico, Albuquerque, NM, USA,
H. L. Schreyer, Univ of New Mexico, Albuquerque, NM, USA,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract:

Material behavior of impact limiters such as aluminum honeycombs and polyurethane foams has been studied experimentally. Four densities of aluminum honeycombs were tested: 3, 8, 12, and 22pcf. The results of Young's modulus under uniaxial compression were obtained for the honeycombs and compared with those from theoretical predictions. The theoretical equations were modified to include nonlinear deformation due to the beam-column effect. Irregular cell parameters observed under a microscope were used in the calculation of the Young's modulus. A series of uniaxial compression, hydrostatic and triaxial compression tests were conducted on polyurethane foams. Four densities of foams: 3, 5, 10, and 20pcf were tested. Mohr's circles plots for foams did not show any dependency of the peak stress on the confinement pressure. A cap model in the J₁ and J_2D space was found to be more appropriate for describing the effect of confinement. Elliptical cap equations were determined for the 5pcf and the 10pcf foams.

Subject Headings: Material properties | Synthetic materials | Polyurethane | Foaming (material) | Material mechanics | Honeycomb structures | Container shipping

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