In situ observations of strained bands and ductile damage in thin aluminum alloy sheets (INVITED)

Abstract eng:
Up to now, when the fracture of ductile sheet materials is studied, the interaction between plasticity and damage (e.g. flat-to-slant transition) is still a matter of active debate. The fundamental question can be phrased as: Which mechanism is responsible for localized phenomena leading to the final failure? To address this issue, mechanical tests have been conducted on notched plates made of 2198 T8 aluminum alloy and imaged via synchrotron laminography at micrometer resolution. Ductile damage is analyzed via the reconstructed volumes and the correlation residuals associated with digital volume correlation. The latter allows displacement fields to be measured and strain fields to be estimated in the bulk of the material during the test. The development of plasticity and damage can therefore be studied during the loading history.

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