Technische Universität Chemnitz
The formation of adiabatic shear bands (ASB) is a deformation mechanism that occurs particularly at high (shear) strain rates in metallic materials with a low thermal conductivity. Shear banding is characterized by energy dissipation during plastic deformation and therefore associated with a local increase in temperature. Finally, local softening and an increasingly pronounced localization of the ongoing deformation occurs. In this contribution, we present a newly designed S-shaped sample geometry that allows an in-situ characterization of shear banding under different stress states. Local shear deformation in a geometrically well-defined shear zone occurs during uniaxial compression of the S-shaped samples. Considering both numerical simulations and experimental measurements, we demonstrate that the predominant shear stress can be superimposed with either tensile or compressive stresses by slightly varying the geometry of the shear zone. Moreover, we show that the sample geometry allows the application of digital image correlation for local shear strain and shear rate measurements as well as temperature measurements at high loading velocities. Metallographic preparation of the samples prior to testing even enables in-situ microstructural investigations during dynamic deformation. The applicability of the sample geometry is validated by dynamic experiments using Ti-10V-2Fe-3Al alloy in a Split-Hopkinson Pressure Bar (SHPB) under nominal strain rates of > 102 s-1 (local shear rates up to 5×104 s-1). Our novel methodology enables detailed research of the formation and growth of adiabatic shear bands.
Abstract
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