SYMPOSIA PAPER Published: 01 January 1984
STP32733S

Fracture Toughness of an Aluminum Alloy from Short-Bar and Compact Specimens

Source

Fracture toughness of a 70-mm-thick plate of the aluminum alloy 7475-T7351 was measured with short-bar and compact specimens. The compact specimens with thicknesses of 25 and 38 mm and the short-bar specimens with thicknesses of 12.5, 25, and 50 mm had T-L orientation and were machined at different distances from the surface. Different heats of the same alloy tested in T-L and L-T orientation furnished a series of fracture-toughness values ranging from 40 to 60 MPa m1/2 in increments of approximately 2 MPa m1/2. For each of the selected heats KIc and KIcSB was determined. Both fracture toughness test methods confirmed a fracture-toughness profile through the thickness direction of the plate. The fracture toughness was highest in the midsection and lowest in the surface region of the plate. Increasing fracture toughness with increasing specimen size was found for both testing methods, but KIcSB was consistently higher than KIc for specimens of identical thickness. The difference between KIc and KIcSB increases with increasing fracture toughness. From the results it is concluded that the through thickness variation of KIc is not the main reason for the higher short-bar values.

Author Information

Eschweiler, J
German Aerospace Research Establishment, Köln, West Germany
Marci, G
German Aerospace Research Establishment, Köln, West Germany
Munz, DG
University of Karlsruhe, Postfach, West Germany
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Details
Developed by Committee: E08
Pages: 255–269
DOI: 10.1520/STP32733S
ISBN-EB: 978-0-8031-4917-5
ISBN-13: 978-0-8031-0401-3