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Titre du Document
Formability and fracture of some higher strength aluminum alloys
Auteur(s)
SOWERBY R. ; SAREEN B. K.
Résumé
This work presents the comparative behavior of some formable grades of aluminum alloy sheet and an aluminum killed drawing quality (AKDQ) steel sheet in a number of formability tests. Tensile data were assembled from specimens cut at different orientations in the plane of the as-received sheet. An attempt was made to fit the stress-strain data with an empirical equation of the form a = k (e 0 + ε)n. The following quantities were also obtained from the tension tests: uniform strain, the plastic strain ratio (r value) and fracture strain. The aluminum alloys showed inferior r values and lower values of fracture strain when compared with the steel sheet; the n value did not always correlate well with the measured uniform strain in the alloys. The aluminum alloys were deformed under different conditions of biaxial straining by stretching over a rigid punch, and forming limit diagrams were constructed. From the same test it was also possible to assess the fracture strains. The fracture thickness strain does not appear to be a single valued material property but can be dependent upon the deformation mode rather like the limit strain. Additional tests performed on the materials included bulging in a circular die under hydraulic pressure, an in-plane torsion test, and an in-plane stretch test designed to promote a plane-strain deformation mode. The results from these tests supplemented the limit and fracture strain data gathered from the punch-stretch tests. The aluminum
Editeur
American Society for Testing and Materials
Identifiant
ISSN : 0066-0558 CODEN : ASTTA8
Source
ASTM special technical publication A. 1978, n° 647, pp. 49-64 [16 pages]
Langue
Anglais
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