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THE DETERMINATION OF R ‐CURVES FOR SHORT, WIDE CENTRE CRACKED PANELS OF ALUMINIUM ALLOY SHEET
Author(s) -
Sutton G. R.,
Wheeler C.,
Thomas C. E.,
Wilson R. N.
Publication year - 1991
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1991.tb00714.x
Subject(s) - aluminium , materials science , aluminium alloy , calibration curve , calibration , alloy , stress intensity factor , structural engineering , tola , composite material , sheet metal , fracture mechanics , mathematics , engineering , statistics , detection limit
— The feasibility of conducting an R –curve test on centre crack test pieces with a length/width ratio of between 1.3 and 0.25 has been investigated. To allow for the undefined mixed mode loading present with short, wide test pieces, two experimental methods of determining the geometric correction for the stress intensity factor have been proposed and compared. Also an experimental determination of the compliance calibration used to calculate the effective crack length has been made for these geometries. These methods have been evaluated by conducting R ‐curve tests on clad 2024‐T3 aluminium alloy centre crack sheet test pieces. 2 m and 760 mm wide panels with length/width ratios of > 1.3, 0.5 and 0.25 were tested. The derived R ‐curves agreed well for both widths and for length/width ratios as low as 0.5.