Crack initiation and growth analysis in explosively welded AA2519–AA1050–Ti6Al4V layered material in ambient and cryogenic conditions

Abstract

The article presents the results of an analysis of the crack growth and fatigue life of CT specimens made of explosively welded AA2519–AA1050–Ti6Al4V layered material for the construction of air and space structures. The investigations were carried out for two temperature conditions: ambient temperature (293 K) and under cryogenic conditions at the temperature of liquid nitrogen (77 K). The analysis of the test results revealed the impact of cryogenic conditions on the process of fatigue cracking of a layered material. However, this impact is partly limited by a significant scatter of the test results, which may be caused by the different character of the process of cracking.

The Influence of Cryogenic Conditions on the Process of AA2519 Aluminum Alloy Cracking

“…Recently AA2519 has become particularly interesting due to the emergence of a completely new explosion-welded Al-Ti material in which AA2519 aluminum alloy is one of the constituent materials. Consequently, the existence of such a composite has focused the attention of researchers who study its mechanical properties, including static properties, fatigue life and fracture toughness [5][6][7][8]. A completely new application provokes research on this alloy in a new context.…”

“…In conclusion, it stated that the described conditions cause improvement in the material's mechanical properties. Our research team also performed tests involving determining the basic mechanical properties for AA2519 under ambient (293 K) and cryogenic conditions (77 K), which are described in the works of [5][6][7][8][18][19][20]. In this article, however, apart from mechanical characteristics describing the material fracture toughness, there are also differences in the specimen fracture appearance obtained for both temperature conditions.…”