TY - GEN
T1 - Characterization of polymeric foams under multi-axial static and dynamic loading
AU - Daniel, Isaac M.
AU - Cho, Jeong Min
PY - 2010
Y1 - 2010
N2 - An orthotropic polymeric foam with transverse isotropy (Divinycell H250) used in composite sandwich structures was characterized under multi-axial quasi-static and dynamic loading. Quasi-static tests were conducted along principal material axes as well as along off-axis directions under tension, compression, and shear. An optimum specimen aspect ratio of 10 was selected based on finite element analysis. Stress-controlled and strain-controlled experiments were conducted. The former yielded engineering material constants such as Young's and shear moduli and Poisson's ratios; the latter yielded mathematical stiffness constants, i. e., Cij. Intermediate strain rate tests were conducted in a servo-hydraulic machine. High strain rate tests were conducted using a split Hopkinson Pressure Bar system built for the purpose. This SHPB system was made of polymeric (polycarbonate) bars. The polycarbonate material has an impedance that is closer to that of foam than metals. The system was analyzed and calibrated to account for the viscoelastic response of its bars. Material properties of the foam were obtained at three strain rates, quasi-static (10-4/V-1), intermediate (1 s-1), and high (103s-1) strain rates.
AB - An orthotropic polymeric foam with transverse isotropy (Divinycell H250) used in composite sandwich structures was characterized under multi-axial quasi-static and dynamic loading. Quasi-static tests were conducted along principal material axes as well as along off-axis directions under tension, compression, and shear. An optimum specimen aspect ratio of 10 was selected based on finite element analysis. Stress-controlled and strain-controlled experiments were conducted. The former yielded engineering material constants such as Young's and shear moduli and Poisson's ratios; the latter yielded mathematical stiffness constants, i. e., Cij. Intermediate strain rate tests were conducted in a servo-hydraulic machine. High strain rate tests were conducted using a split Hopkinson Pressure Bar system built for the purpose. This SHPB system was made of polymeric (polycarbonate) bars. The polycarbonate material has an impedance that is closer to that of foam than metals. The system was analyzed and calibrated to account for the viscoelastic response of its bars. Material properties of the foam were obtained at three strain rates, quasi-static (10-4/V-1), intermediate (1 s-1), and high (103s-1) strain rates.
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M3 - Conference contribution
AN - SCOPUS:78049449163
SN - 9781617386909
T3 - Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010
SP - 506
EP - 514
BT - Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010
T2 - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010
Y2 - 7 June 2010 through 10 June 2010
ER -