Abstract
Hybrid experimental-numerical and experimental analyses were used to explore possible dynamic ductile fracture parameters associated with rapid crack propagation in 7075-T6 and 2024-T3 aluminum alloy, single edge notched (SEN) specimens of 1.6 mm thickness. Dynamic Moiré interferometry was used to record the displacement field, which was used either to drive a dynamic elasto-plastic finite element (FE) model of the fracturing SEN specimen or by itself, to determine the crack-tip J-integral, the T * ε -integral and the crack tip opening angle (CTOA). The near-field J vanished but the near-field T * ε reached a constant value with crack propagation. The CTOA associated with a low crack velocity also remained constant during crack propagation but fluctuated at higher crack velocity. The results of this preliminary study suggest that either the T * ε or the CTOA criteria proposed for stable crack growth could be a suitable parameter for characterizing rapid crack propagation in these thin aluminum specimens.
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Lee, J., Kokaly, M.T., Kobayashi, A.S. (1998). Dynamic ductile fracture of aluminum SEN specimens an experimental-numerical analysis. In: Knauss, W.G., Schapery, R.A. (eds) Recent Advances in Fracture Mechanics. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2854-6_3
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DOI: https://doi.org/10.1007/978-94-017-2854-6_3
Publisher Name: Springer, Dordrecht
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