The impact behavior of aluminum alloy 6061: Effects of notch severity |
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Authors: | T S Srivatsan J Champlin P C Lam M Manoharan |
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Affiliation: | (1) Department of Mechanical Engineering, The University of Akron, Akron, Ohio 44325-3903, USA;(2) Division of Materials Engineering, School of Applied Sciences, Nanyang Technological University, Nanyang Avenue, Singapore, 639798 |
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Abstract: | In this paper the influence of notch acuity and test temperature on the impact behavior of aluminum alloy 6061 is presented and discussed. Notch angles of 45°, 60°, 75° and 90° were chosen for a standard charpy impact test specimen containing two such notches positioned at right angles to the applied load. For a given angle of the notch the dynamic fracture toughness increased with an increase in test temperature. At a given test temperature, the impact toughness of a ductile microstructure decreased with an increase in notch severity. For the least severe notch dynamic fracture surfaces revealed the occurrence of localized mixed-mode deformation at the elevated temperature. An increase in notch severity resulted in essentially Mode-I dominated fracture at all test temperatures. The results are discussed in light of alloy microstructure, fracture mechanisms and deformation field ahead of the advancing crack tip. |
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