Abstract
This paper presents the results of an experimental study of the influence of loading velocity on the fracture toughness of a SiC whisker reinforced 6061 aluminum alloy composite. A precracked three-point bend specimen configuration was selected for fracture toughness measurement, with tests being conducted at loading velocities of 5×10−6 to 10 m·s−1. The results showed that the fracture toughness shows no evident variation with the loading velocity increasing to 1 m·s−1, while, when the loading velocity is larger than 1 m·s−1, the increase of fracture toughness of the composite material becomes remarkable. The composite material failed mainly in a manner of whisker pull-out and whisker cracking. As the loading velocity increases, the whisker cracking becomes predominant, and both the microvoiding and microcracking prevail and extend over a longer distance from the fracture surface. This is believed to account for the loading velocity effect on the fracture toughness.
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