measurementTests were performed at room temperature on single fiber bun-dles. Precise diameter measurement is a major challenge for asingle natural fiber bundle. Unlike synthetic fibers, natural fibersare characterized by irregular shapes and textures along with the irlengths as well as non-uniform thickness Nat-ural fibers also have inherent defects within themselves
Moreover, a single fiber bundle consists of a large number of elemental fibers attached together by the matrix of lignin and hemicellulose. Hence, the single fiber bundle’s cross-sectional geometry,in general, is not circular However, it is generally assumed to becircular in cross-section in calculating the tensile properties, eventhough the cross-section is not uniform along the length of the fiber Single natural fiber bundle diameters have been determined byresearchers using various microscopic measurements for tensiletesting measured the diameters of single hempfiber bundles by using optical microscopy (OM) study. Scanningelectron microscope (SEM) was used by Eichhorn and Young (2004)to measure hemp fiber bundle diameters