The determination and comparison of energy propagating behaviour of woven and uni-directional para-aramid fabrics by 2-D thin plate spline method

Abstract

In this study, propagating behavior of impact energy on the para-aramid woven and unidirectional fabric plane is researched by using 2-D TPS method. For this purpose, a weight with hemispherical tip was dropped from a certain height and the dimensions of the deformation on fabric with different number of plies were determined. For the purpose of examining the effect of yarn directions in fabric on energy spreading behavior, dimensions of deformation generated on panels constructed in 0790° and 07907±45° yarn directions were measured. By using shape changes that occur due to the deformation, energy propagating behavior of fabrics on their planes was found. Bending energy of fabrics was calculated for finding energy propagating behavior and expansion factors were determined. It was found that unidirectional fabrics spread out impact energy on the plane better than woven structures and fiber reinforcements in ±45° directions on both structures expand energy's propagating area and decrease the effect of impact.