WEB The evolution of local strain for structured sheet metals during uniaxial deformation
Structured materials can be a progressive alternative to commonly used flat sheets. These materials offer higher bending stiffness and stability compared to flat sheet metals made of the same alloy. The application of sheet metals requires specific test set-ups and implementation of tests regarding their strength and deformation behaviour.
The aim of this work is to obtain new knowledge about deformation mechanisms of structured sheet metals.
Structured sheet metals made of conventional deep-drawing steel DC04 were investigated by means of tensile tests. The influence of the structure type arrangement on the deformation behaviour was investigated. The evolution of local strains was analyzed by means of strain gauge measurements as well as 3D-displacement measurement with the ARAMIS high resolution camera-system. Local orientation changes were measured using the electron backscatter diffraction technique. Strain concentrations could be identified close to the triple points and within bridges, inclined with respect to the deformation direction. A rotation of these bridges towards the direction of maximum shear stress takes place and results in local failure of the material.