Uniaxial Tensile Behaviour of 75 μm Thick Stainless-Steel Foils

Accurate knowledge about tensile behavior of thin stainless-steel foils at micro/meso scale is of great importance for potential industrial applications. In this work, two 75 mu m thick AISI 304L and 439 stainless-steel foils were tested under uniaxial tension. Digital image correlation (DIC) based strain measurement method was applied to characterize the plastic deformation of foil specimen. The stress-strain relations of foil specimens were identified from DIC-based strain measurement and compared with the results derived from crosshead displacement. It is found that the applied DIC method can more precisely characterize the mechanical behaviors of foil materials at small size scale. Fracture surface of foil specimens were also characterized. The material microstructures are found have predominant effect on tensile behaviors of foil materials.