Abstract
In this study, crushing experiments are performed on four kinds of cellular materials using a large diameter (60 mm) nylon Hopkinson bar. The impact velocities are chosen around the critical velocity corresponding to the occurrence of a shock front predicted by the classical RPPL model (Reid and Peng, 1997). The experimental setup allows to measure the stress enhancement due to the shock front propagation. In particular, for one type of material, a high speed camera is used to capture about ten images at 20,000 fps and then the strain field during testing is obtained by a special image correlation program (CorreliLMT). This strain field allows to measure directly the shock front velocity. Moreover, an improved model, including the hardening curve, is proposed to predict this shock enhancement. Finally, numerical analyses using Ls-Dyna explicit code show that for all experiments a macroscopic homogeneous phenomenological material law can reproduce essential features of stress enhancement due to shock front propagation.
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References
El Nasri I, Pattofatto S, Zhao H, Tsitsiris H, Hild F and Girard Y (2007) Shock enhancement of cellular structures under impact loading: Part I Experiments, J. Mech. Phys. Solids, 55:2652–2671
Hallquist JO (1998) Ls-Dyna theoretical manual. Livermore Software Technology Corporation, Livermore, CA
Lopatnikov SL, Gama BA, Haque Mdj, Krauthauser C, Gillespie JW, Guden M, Hall IW (2003) Dynamics of metal foam deformation during Taylor cylinder-Hopkinson impact experiment, Compos. Struct., 61:61–71
Lopatnikov SL, Gama BA, Haque Mdj, Krauthauser C, Gillespie JW, Guden M (2004) High-velocity plate impact of metal foams, Int. J. Impact Eng., 30:421–445
Pattofatto S, El Nasri I, Zhao H, Tsitsiris H, Hild F and Girard Y (2007) Shock enhancement of cellular structures under impact loading: Part II analysis, J. Mech. Phys. Solids, 55:2672–2686
Radford DD, Deshpande VS, Fleck NA (2005) The use of metal foam projectile to simulate shock loading on a structure, Int. J. Impact Eng., 31:1152–1171.
Reid SR, Peng C (1997) Dynamic uniaxial crushing of wood, Int. J. Impact Eng., 19:531–570
Tan PJ, Harrigan JJ, Reid SR (2002) Inertia effects in uniaxial dynamic compression of a closed cell aluminium alloy foam, Mater. Sci. Technol., 18:480–488
Tan PJ, Reid SR, Harrigan JJ, Zou Z, Li S (2005) Dynamic compressive strength properties of aluminium foams. Part I—experimental data and observations, J. Mech. Phys. Solids, 53:2174–2205
Zhao H, Abdennadher S (2004) On the strength enhancement of rate insensitive square tubes under impact loading, Int. J. Solids Structs., 4:6677–6697
Zhao H, Nasri I, Abdennadher S (2005) An experimental study on the behaviour under impact loading of metallic cellular materials, Int. J. Mech. Sci., 47:757–774
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Pattofatto, S., Nasri, I., Zhao, H., Hild, F., Girard, Y., Tsitsiris, H. (2009). Shock Enhancement due to Shock Front Propagation in Cellular Materials. In: Zhao, H., Fleck, N.A. (eds) IUTAM Symposium on Mechanical Properties of Cellular Materials. IUTAM Bookseries, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9404-0_17
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DOI: https://doi.org/10.1007/978-1-4020-9404-0_17
Publisher Name: Springer, Dordrecht
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