The effects of vanadium layer thickness (100, 200 and 400 μm) on the resistance-curve behavior of NiAl/V, microlaminates are examined in this paper. The fracture resistance of the NiAl microlaminates reinforced with 20 vol.% of vanadium layers is shown to increase with increasing vanadium layer thickness. The improved fracture toughness (from an NiAl matrix toughness of to a steady-state toughness of obtained from finite element analysis) is associated with crack bridging and the interactions of cracks with vanadium layers. The reinitiation of cracks in adjacent NiAl layers is modeled using finite element methods and the reinitiation is shown to occur as a result of strain concentrations at the interface between the adjacent NiAl layers and vanadium layers. The deviation of the reinitiated cracks from the pure mode I direction is shown to occur in the direction of maximum shear strain. Toughening due to crack bridging is also modeled using large-scale bridging models. The intrinsic toughness levels of the microlaminates are also inferred by extrapolating the large scale bridging models to arbitrarily large specimen widths. The extrapolations also show that the small-scale bridging intrinsic toughness increases with increasing vanadium layer thickness.
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October 1999
Technical Papers
An Investigation of the Effects of Layer Thickness on the Fracture Behavior of Layered NiAl/V Composites
M. Li,
M. Li
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210-1179
e-mail: li.285@osu.edu
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R. Wang,
R. Wang
Applied Mechanics Section, Department of Aerospace Engineering, Applied Mechanics and Aviation, The Ohio State University, 2041 College Road, Columbus, OH 43210-1179
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N. Katsube,
N. Katsube
Applied Mechanics Section, Department of Aerospace Engineering, Applied Mechanics and Aviation, The Ohio State University, 2041 College Road, Columbus, OH 43210-1179
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W. O. Soboyejo
W. O. Soboyejo
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210-1179
Search for other works by this author on:
M. Li
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210-1179
e-mail: li.285@osu.edu
R. Wang
Applied Mechanics Section, Department of Aerospace Engineering, Applied Mechanics and Aviation, The Ohio State University, 2041 College Road, Columbus, OH 43210-1179
N. Katsube
Applied Mechanics Section, Department of Aerospace Engineering, Applied Mechanics and Aviation, The Ohio State University, 2041 College Road, Columbus, OH 43210-1179
W. O. Soboyejo
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210-1179
J. Eng. Mater. Technol. Oct 1999, 121(4): 453-459 (7 pages)
Published Online: October 1, 1999
Article history
Received:
December 11, 1998
Revised:
May 25, 1999
Online:
November 27, 2007
Citation
Li, M., Wang, R., Katsube, N., and Soboyejo, W. O. (October 1, 1999). "An Investigation of the Effects of Layer Thickness on the Fracture Behavior of Layered NiAl/V Composites." ASME. J. Eng. Mater. Technol. October 1999; 121(4): 453–459. https://doi.org/10.1115/1.2812401
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