Shock Hugoniot measurements in foam

18th APS-SCCM; 24th AIRAPT

Petel, O.E.^1 ; Ouellet, S.^2 ; Frost, D.L.^3 ; Higgins, A.J.^3

Carleton University, Mechanical and Aerospace Engineering, Ottawa

ON

K1S 5B6, Canada^1

Defence Research and Development Canada Valcartier, Quebec

QC

G3J 1X5, Canada^2

McGill University, Department of Mechanical Engineering, Montreal

QC

H3A 0C3, Canada^3

关键词: Hopkinson bar experiments;    Measurements of;    Open cell aluminum foams;    Open-cell foams;    Photonic doppler velocimetry;    Polymeric foams;    Uniaxial strain compressions;    Wave structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/11/112050/pdf
DOI  :  10.1088/1742-6596/500/11/112050

来源: IOP

【 摘 要 】

The present study outlines a new approach to collecting shock Hugoniot data in foams using photonic Doppler velocimetry to perform mid-plane measurements of the foam deformation. Plate impact experiments were carried out to investigate wave propagation in a closed-cell polymeric foam and an open-cell aluminum foam. Dual-wave structures were observed in both materials with the leading precursor wave determined to be an elastic wave. The discussion of the results focuses on the nature of foam compression under high-rate loading, particularly the difference between the strain history in a foam undergoing uniform stress compaction and uniaxial strain compression. These results are discussed in reference to the current interpretations of Taylor-Hopkinson bar experiments on similar metallic foams. The importance of gas-filtration driven flows in the wave dynamics of open-cell foams is discussed in relation to the nature of the precursor waves.