The fracture toughness of highly-ordered multi-wall carbon-nanotube-reinforced alumina composites is calculated from experimental data on nanoindentation cracking. A combined analytical and numerical model, using cohesive zone models for both matrix cracking and nanotube crack bridging and accounting for residual stresses, is developed to interpret the indentation results and evaluate the fracture toughness of the composite. Results show that residual stress and nanotube bridging play important roles in the nanocomposite fracture. The contribution to toughness from the nanotube bridging for cracking transverse to the axis of the nanotubes is calculated to be ∼5 MPa-m1/2. From the nanotube bridging law, the nanotube strength and interfacial frictional stress are also estimated and range from 15–25 GPa and 40–200 MPa, respectively. These preliminary results demonstrate that nanotube-reinforced ceramics can exhibit the interfacial debonding/sliding and nanotube bridging necessary to induce nanoscale toughening, and suggest the feasibility of engineering residual stresses, nanotube structure, and composite geometry to obtain high-toughness nanocomposites.
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July 2004
Technical Papers
Fracture Toughness of Highly Ordered Carbon Nanotube/Alumina Nanocomposites
Z. Xia,
Z. Xia
Division of Engineering, Brown University, Providence, Rhode Island, 02912
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W. A. Curtin,
W. A. Curtin
Division of Engineering, Brown University, Providence, Rhode Island, 02912
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B. W. Sheldon
B. W. Sheldon
Division of Engineering, Brown University, Providence, Rhode Island, 02912
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Z. Xia
Division of Engineering, Brown University, Providence, Rhode Island, 02912
W. A. Curtin
Division of Engineering, Brown University, Providence, Rhode Island, 02912
B. W. Sheldon
Division of Engineering, Brown University, Providence, Rhode Island, 02912
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division July 30, 2003; revision received March 1, 2004. Associate Editor: Y. Huang.
J. Eng. Mater. Technol. Jul 2004, 126(3): 238-244 (7 pages)
Published Online: June 29, 2004
Article history
Received:
July 30, 2003
Revised:
March 1, 2004
Online:
June 29, 2004
Citation
Xia , Z., Curtin , W. A., and Sheldon, B. W. (June 29, 2004). "Fracture Toughness of Highly Ordered Carbon Nanotube/Alumina Nanocomposites ." ASME. J. Eng. Mater. Technol. July 2004; 126(3): 238–244. https://doi.org/10.1115/1.1751179
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