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Titolo:
High strain rate properties of selected aluminium alloys
Autore:
Oosterkamp, LD; Ivankovic, A; Venizelos, G;
Indirizzi:
Hydro Aluminium, R&D Mat Technol, N-4265 Havik, Norway Hydro Aluminium Havik Norway N-4265 &D Mat Technol, N-4265 Havik, Norway Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London SW7 2BX, England Univ London Imperial Coll Sci Technol & Med London England SW72BX gland
Titolo Testata:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
fascicolo: 1-2, volume: 278, anno: 2000,
pagine: 225 - 235
SICI:
0921-5093(20000215)278:1-2<225:HSRPOS>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRESS; TESTS; FLOW;
Keywords:
aluminium alloys; high strain rates; Split Hopkinson Pressure Bar; finite volume; extrusion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Oosterkamp, LD Hydro Aluminium, R&D Mat Technol, N-4265 Havik, Norway Hydro Aluminium Havik Norway N-4265 N-4265 Havik, Norway
Citazione:
L.D. Oosterkamp et al., "High strain rate properties of selected aluminium alloys", MAT SCI E A, 278(1-2), 2000, pp. 225-235

Abstract

The strain rate sensitivity of two commercial aluminium alloys AA6082 and AA7108 in peak temper T6 and overaged T79 condition is analysed. These alloys are precipitation hardenable and as such, are expected to have a relatively low strain rate sensitivity. Their response to rapid loading has been tested over a wide range of strain rates, from 0.1 to 3000 s(-1) at room temperature, 375 and 515 degrees C for AA6082 and room temperature, 280 and 340 degrees C for AA7108. Specimens were cut from planar extruded sections and tested in uniaxial compression with the deformation axis parallel to the extrusion direction. Intermediate strain rate testing was carried out usinga computer controlled servo-hydraulic testing machine and high strain ratetesting above 500 s(-1) on a Split Hopkinson Pressure Bar (SHPB). Owing toinaccuracies of the conventional Kolsky solution of the SHPB, a numerical simulation was performed. The flow stress at a plastic strain of 5% was plotted as a function of strain rate and temperature. Up to 2000 s(-1), there is very little change of the activation volume with increasing temperature for both alloys, indicating that barriers to thermal activation are large and approximately the same. However, at higher strain rates, the rate controlling mechanism appears to change and at lower temperatures, a trend towards negative strain rate sensitivity was observed. Metallographic examinationof AA7108 revealed strain localisation, seen as parallel deformation bands. The strain localisation could be the cause of the negative strain rate sensitivity. (C) 2000 Elsevier Science S.A. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 17:48:54