The actual high speed material testing techniques including dropweight machines, split hopkinson pressure bars (SHPBs), Taylor impact, and shockloading by plate have a common problem related to the disturbed wave by mechanical oscillation. In this paper, a new method based on 'rotating disk indirect bar-bar tensile impact apparatus (RSHTB)' is presented. The novelty of the RSHTB method consists in the fact that a destructive short metal bar is used to solve the problem of the mechanical oscillation, using its fracture to filter the oscillation wave. As a result, the reliability of the acquired data is significantly improved. The dynamic deformation behaviors of 2 aluminum alloys (AA6016, AA5182) and 2 steels (v 1158, FeP04) are investigated. The test results reveal that the strain rate range used in this study is between 290 s-1 and 1750 s-1.The yield stresses of all four tested materials increase along with the increase of strain rate, but the ductility does not. An interesting finding is that the tested Al alloys demonstrated larger elongation than those of steels. In conventional tensile tests, as it is well known, the tensile elongation of low carbon steels is usually much higher than the one of Al alloys. With regard to the mechanical properties it is assumed that aluminum alloys are very suitable for high speed forming applications, while the high strain rate sensitivity of steels can bring about big advantages in automotive applications in terms of crashworthiness.
Materials characterization at high speed by dynamic tensile tests
2006
11 Seiten, 8 Bilder, 2 Tabellen, 12 Quellen
Conference paper
English
Werkstoffprüfung , beschleunigte Prüfung , Aluminiumlegierung , Stahl , Schlagzugversuch , mechanische Schwingung , Zuverlässigkeit , Verformungsgeschwindigkeit , Formänderungsfestigkeit , Streckbarkeit , mechanische Eigenschaft , Hochgeschwindigkeitsumformen , Autoindustrie , Aufprallenergieabsorptionsvermögen
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