A dislocation density-based crystal plasticity framework, a nonlinear computational finite-element methodology adapted for nucleation of crack on cleavage planes, and rational crystallographic orientation relations were used to predict the failure modes associated with the high strain rate behavior of aluminum-bonded composites. A bonded aluminum composite, suitable for high strain-rate damage resistance application, was modeled with different microstructures representing precipitates, dispersed particles, and grain boundary (GB) distributions. The dynamic fracture approach is used to investigate crack nucleation and growth as a function of the different microstructural characteristics of each alloy in bonded composites with and without pre-existing cracks. The nonplanar and irregular nature of the crack paths were mainly due to the microstructural features, such as precipitates and dispersed particles distributions and orientations, ahead of the crack front. The evolution of dislocation density and the subsequent formation of localized plastic slip contributed to the blunting of the propagating crack(s). Extensive geometrical and thermal softening resulted in localized plastic slip and had a significant effect on crack path orientations and directions along cleavage planes.
Dynamic Fracture of Aluminum-Bonded Composites
Indian Institute of Technology,
Guwahati 781039, India
North Carolina State University,
Raleigh, NC 27695-7910
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received September 30, 2015; final manuscript received March 2, 2016; published online May 10, 2016. Assoc. Editor: Ghatu Subhash.
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Khanikar, P., Wu, Q., and Zikry, M. A. (May 10, 2016). "Dynamic Fracture of Aluminum-Bonded Composites." ASME. J. Eng. Mater. Technol. July 2016; 138(3): 031009. https://doi.org/10.1115/1.4033036
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