A Three Dimensional Numerical Investigation of the T∗ integral along a Curved Crack Front
نویسندگان
چکیده
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. keyword: T ∗ ε integral, 3-D fracture, CTOA, stable crack growth, crack tunneling.
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