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Abstract
This paper presents the experimental investigation of the crack arrest capability under impact loading of two types of aluminum alloys that are mainly used in the field of aeronautics, viz. AA2024 and AA7175. Using gas launcher, impact tests were carried out on the edge of double notched plates made of the aluminum alloys. A range of impact speeds was applied from 100 m s−1 to 230 m s−1. The two alloys show different crack arrest capabilities and failure modes under impact loading. Further analysis on fractured surface reveals that the failure occurs under combination of opening Mode I and shearing Mode II for AA2024 and predominant shearing Mode II for AA7175. Nano-indentation tests were done in a zone containing the tip of the crack to measure the micro hardness field of the surface. Under high loading rate there is evidence of adiabatic shear banding formation for AA7175 which leads to premature failure of the material whereas on the other hand there is no evidence of adiabatic shear band on AA2024.
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