TY - EJOU AU - Jackson, J. H. AU - Kobayashi, A. S. AU - Atluri, S. N. TI - A Three Dimensional Numerical Investigation of the T* integral along a Curved Crack Front T2 - Computer Modeling in Engineering \& Sciences PY - 2004 VL - 6 IS - 1 SN - 1526-1506 AB - The T_ε^* integral was calculated numerically along an extending, tunneling crack front in an 8 mm thick, aluminum three-point bend (3PB) specimen, using a numerical model driven by experimentally obtained surface displacements. The model provided input to a contour integration for the T_ε^* integral, via the Equivalent Domain Integral (EDI) method with incremental plasticity. Validity of the analysis was ensured by the agreement of the T_ε^* integral obtained on the surface (plane stress) and the plane stress values from previous studies. T_ε^* was observed to decrease from the outer surface of the specimen to the more constrained mid-plane. This difference became more pronounced as the crack grew. KW - T_ε^* integral KW - 3-D fracture KW - CTOA KW - stable crack growth KW - crack tunneling DO - 10.3970/cmes.2004.006.017