SEDL / STP / STP1171-EB / STP18040S

Influence of Specimen Size on J-, J^m- and δ⁵-R-Curves for Side-Grooved Compact-Tension Specimens

Heerens, J
GKSS-Research Centre Geesthacht, Max-Planck-Strasse, Geesthacht,

Schwalbe, K-H
GKSS-Research Centre Geesthacht, Max-Planck-Strasse, Geesthacht,

Nix, C
GKSS-Research Centre Geesthacht, Max-Planck-Strasse, Geesthacht,

Pages: 44    Published: Jan 1993

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Abstract

The influence of specimen size and geometry on R-curves has been studied for a pressure vessel steel and an aluminum alloy using side-grooved compact-tension specimens. The specimen thickness reduction (necking) was used to quantify changes of constraint in laboratory specimens. The results show that the crack tip opening displacement, δ⁵, and the modified J-integral Jm, can correlate significantly more stable crack growth than the conventional J-integral.