T*ε-integral values associated with stable crack growth in thin 2024-T3 aluminum single edge notched (SEN), central notched (CN) and compact (CT) specimens were evaluated experimentally and numerically along a near-crack contour. Γε. which elongated with crack extension. The surface displacement fields, which were determined by Moiré interferometry and by an elastic-plastic finite element (FE) simulation of the measured stable crack growth, were used to determine the Γ*ε through an equivalent domain integral method. The experimentally and numerically determined T*ε's, as well as the crack tip opening displacements (CTOA). were in excellent agreement through a stable crack growth in excess of Δa = 4 mm. T*ε for the SEN and CN specimens coincided while T*ε for the CT specimen was lower. These results, which are similar in trend with the fracture toughness measurements, suggest that T*ε for a given Γε could be a material property which characterizes stable crack growth .
|Number of pages||6|
|Journal||American Society of Mechanical Engineers, Aerospace Division (Publication) AD|
|State||Published - 1996|