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Titolo:
STRESS WAVE-PROPAGATION EFFECTS IN SPLIT HOPKINSON PRESSURE BAR TESTS
Autore:
DIOH NN; IVANKOVIC A; LEEVERS PS; WILLIAMS JG;
Indirizzi:
UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT MECH ENGN,EXHIBIT RDLONDON SW7 2BX ENGLAND
Titolo Testata:
Proceedings - Royal Society. Mathematical and physical sciences
fascicolo: 1936, volume: 449, anno: 1995,
pagine: 187 - 204
SICI:
0962-8444(1995)449:1936<187:SWEISH>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAPID DEFORMATION-BEHAVIOR; HIGH-DENSITY POLYETHYLENE; STRAIN-RATE COMPRESSION; POLYCARBONATE; TEMPERATURES; POLYMERS; RANGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
N.N. Dioh et al., "STRESS WAVE-PROPAGATION EFFECTS IN SPLIT HOPKINSON PRESSURE BAR TESTS", Proceedings - Royal Society. Mathematical and physical sciences, 449(1936), 1995, pp. 187-204

Abstract

Studies of the properties of materials at high strain rates by the split Hopkinson pressure bar suggest that most materials show a sharp increase in strain rate sensitivity at high rates. In this paper, analytical and numerical evidence is presented which shows that his apparentincrease in the strain rate sensitivity reported in the literature may result from stress wave propagation effects present in the test. A one-dimensional analytical solution has been developed for a rate independent bi-linear material tested in a split Hopkinson pressure bar apparatus. The solution, which is based on a stress wave reverberation model, shows that there is an apparent increase in the strain rate sensitivity of the material which can only be explained in terms of large propagating plastic wave fronts in the specimen. Numerical modelling ofthe same test geometry for the same input material model is in excellent agreement showing conclusively that stress wave propagation effects are inevitable at high impact velocities. The assumption of uniform stress and strain distribution within a split Hopkinson pressure bar specimen is therefore incorrect at high impact velocities. The formulation of the novel numerical code used in the present work, which is based on the finite volume technique, is also presented.

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Documento generato il 26/09/20 alle ore 01:23:26