Exploring digital image correlation technique for the analysis of the tensile properties of all-cellulose composites

Abstract All-cellulose composites (ACCs) were prepared from filter paper via partial dissolution in the ionic liquid 1-ethyl-3-methylimidazolium acetate, and material tensile properties investigated using various approaches. One is based on data directly taken a testing machine, other uses two-cameras stereovision with digital image correlation (DIC) technique. In latter case, virtual extensometer different locations sample averaging over surface tested. Nominal true stress–strain dependences built Young's modulus, strength, elongation at maximal stress toughness evaluated as function of ACC density. A minor difference was observed for derived approaches which use DIC technique, most probably because low deformation. However, results reveal that nominal curve significantly provided by machine sensors thus strongly impacting Young’s modulus break values. This study provides an insight into evaluation mechanical ACCs. Graphic abstract