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In Situ Observation of Strained Bands and Ductile Damage in Thin AA2139-T3 Alloy Sheets

Buljac, Ante; Taillandier-Thomas, Thibault; Morgeneyer, Thilo F.; Helfen, Lukas; Roux, Stéphane; Hild, François

The interactions between plasticity and damage mechanisms are not clearly established concerning the fracture of ductile sheet materials (e.g., flat to slant transition). The question addressed herein is to elucidate which mechanism is responsible for localized phenomena leading to the final failure. A mechanical test carried out on a notched plate made of 2139-T3 aluminum alloy is imaged thanks to synchrotron laminography at micrometer resolution. Ductile damage (i.e., void nucleation, growth and coalescence) is analyzed via reconstructed volumes. Although the low volume fraction of secondary phases in the tested alloy is challenging, digital volume correlation is also utilized to measure displacement fields and estimate strain fields in the bulk of the alloy during the whole test. In the first part of this study, the resolution of the measurement technique is assessed under such conditions. Then strained bands are shown to occur very early on in what will be the slant region of the fracture path. Conversely, damage grows at very late loading steps.

Zugehörige Institution(en) am KIT ANKA - die Synchrotronstrahlungsquelle am KIT (ANKA)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1016/j.piutam.2017.03.009
ISSN: 2210-9838
KITopen ID: 1000069344
HGF-Programm 56.03.10; LK 01
Erschienen in Procedia IUTAM
Band 20
Seiten 66–72
Schlagworte Damage; Digital Volume Correlation; Flat-to-slant transition; Laminography; Plasticity
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