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Dynamic strength properties of nano-composites:correcting dispersion effects
Technical Paper
2007-01-2870
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Dynamic material characterization is a fundamental issue in structural analysis and the main apparatus used to perform dynamic material tests is the so called Split Hopkinson Pressure Bar, SHPB. This device is based on the propagation of elastic waves in long bars. Due to lateral inertia, the waves traveling in the bars change their shape, which causes some errors on the evaluation of the stress-strain-strain rate in the tested sample. In this article one examines the influence of the correction of such effect on experimental data measured when testing a composite material. The material is a S2-glass/epoxy with nanoclays that were impregnated in the matrix for strength enhancement. Experimental data are discussed in the light of the dispersion correction, showing that such a procedure is an important aspect for a correct representation of the composite strength properties.
Authors
- Rafael Traldi Moura - Group of Solid Mechanics and Structural Impact Dep. of Mechatronics and Mechanical Systems Eng. University of São Paulo - São Paulo - Brazil
- Rafael Celeghini Santiago - Group of Solid Mechanics and Structural Impact Dep. of Mechatronics and Mechanical Systems Eng. University of São Paulo - São Paulo - Brazil
- Marcilio Alves - Group of Solid Mechanics and Structural Impact Dep. of Mechatronics and Mechanical Systems Eng. University of São Paulo - São Paulo - Brazil
Topic
Citation
Moura, R., Santiago, R., and Alves, M., "Dynamic strength properties of nano-composites:correcting dispersion effects," SAE Technical Paper 2007-01-2870, 2007, https://doi.org/10.4271/2007-01-2870.Also In
References
- Li, M. Wang, R. Han, M. B. 1993 A Kolsky Bar: Tension, Tension-tension Experimental Mechanics March 7 14
- Hopkinson, B. 1914 A method of measuring the pressure in the deformation of high explosives by impact of bullets P hil. Trans. Roy. Soc. A213 437 452
- Davies, R. M. 1948 A critical study of Hopkinson pressure bar Phil. Trans. Roy. Soc. A240 375 457
- Kolsky, H. 1949 An investigation of mechanical properties of materials at very high rates of loading Proc. Phys. Soc. B62 676 700
- Gallina, F. Birch, R.S. Alves, M. 2003 Design of a split Hopkinson Pressure Bar Brazilian Conference on Mechanical Engineering São Paulo
- Kolsky, H. 1963 Stress Waves in Solids Clarendon Press Oxford
- Pochhammer, L. 1876 On the propagation of Small Oscillations in an unlimited isotropic circular cylinder J. F. Math. 81 324 326
- Chree, C. 1889 The equations of an isotropic elastic solid in polar and cylindrical coordinate their solutions and applications Cambridge Phil. Soc. Trans. 14 250 369
- Bancroft, D. 1941 The velocity of longitudinal waves in cylindrical bars Physical Review 59 588 593
- Gorham, D. A. 1983 A numerical method for the correction of dispersion in pressure bar signals J. Phys. E. Sci. Instm. 16 477 479
- Follansbee, P. S. Frantz, C. 1983 Wave propagation in the split Hopkinson pressure bar Journal of Engineering Materials and Technology 105 61 66
- Govender, R. A. 2005 Numerical Investigation of Dispersion in Hopkinson Pressure Bars Master Thesis University of Cape Town South Africa
- Morrison, N. 1994 Introduction to Fourier Analysis John Wiley & Sons
- Ávila, A.F. Soares, M.I. Silva Neto, A. 2005 An experimental investigation on nanocomposites under impact loading WIT Transactions on Engineering Sciences, Impact Loading of Lightweight Structures Alves M. Jones N. 49 89 102