Abstract
This study is a quantitative, experimental study of development of shear band formation during plane strain extension of ferrite-austenite sheet. The position of aligned austenite islands was used to measure internal shape change throughout the development of flow localization to sheet failure. Through-thickness shearing flow and rotation of material by an angle φ develop during nonuniform thinning in order to maintain compatibility between deforming subelements of sheet. Surface grains fail in the locations of sheet where φ is near maximum. A pair of short shear bands form at the location of surface grain separation. Sample-scale shear bands initiate during subsequent deformation from one of the short shear bands created by surface grain failure. Sample-scale bands initiate heterogeneously and grow in volume during continuing sheet extension. Sheet failure develops once sample-scale shear bands grow across the entire cross section of sheet. These processes are described using a series of solid element models.
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