Tε*-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 Tε*. The experimentally and numerically determined Tε*'s and those of the crack tip opening angles (CTOA), were in excellent agreements with each other. Variations in Tε* and CTOA with crack extension of all three specimens were in essential agreement, albeit the continually increasing Tε* of the SEN specimen.
- Integral values