Abstract
This study presents the results of tests involving determining quantities used to describe fracture toughness of a heat-treated AA2519 aluminum alloy applied in, among other things, constructing American military amphibians. These quantities were determined using the J–R curve method for two temperature values, 293 K and 77 K. The low temperature was provided by putting the tested specimen into a liquid nitrogen bath and keeping it there throughout the experiment. Based on the tests results, cryogenic conditions cause an increase in the maximum experimental value of the J–JQ integral, from 66.3 to 87.3 kJ/m2 Moreover, an analysis of the fatigue fracture microstructure revealed differences between specimens tested in ambient temperature and those tested in cryogenic temperature.
Highlights
Due to their lower density, aluminum alloys are often used as an alternative to steel in constructing different structures
This study presented the results determining the maximum experimental value of the J–JQ integral characteristic to provide an assessment of the impact of temperatures down to 77 K on fracture toughness in terms of elasticity–plasticity
The maximum experimental value of the J–JQ integral, determined using the J–R curve and a ratio of dimensions W/B = 4, met the requirements to be considered as a mechanical characteristic that could be used for comparing the material fracture toughness
Summary
Due to their lower density, aluminum alloys are often used as an alternative to steel in constructing different structures. The development of new manufacturing technologies and heat treatments were real breakthroughs in using aluminum alloys, including durals in the shipbuilding, military and aviation industries. Designers develop these materials because they are light while maintaining good mechanical properties, compared to steel, and due to their special features including small inner resistance, high plasticity or desired corrosion resistance [2]. Durals belong to these materials, and AA2519 aluminum alloy is a dural that is considered to be interesting. NASA and the American army have been interested in it since the 1980s [3,4]
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