Optimization of pitch distance of kevlar thread stitching in chopped GFRP composite laminates

Abstract

The glass fibre reinforced polymer (GFRP) composites are widely used in critical parts of the aircrafts. The inter-laminar and intra-laminar shear strength of GFRP laminated composite structures are weak due to presence of voids in matrix, tools dropping during maintenance, birds hitting, lightning strikes. This paper investigates the effect of kevlar thread pitch distance in chopped GFRP composite laminates. The inter-laminar and intra-laminar shear strength of the composites was improved by using kevlar thread stitching in composites. This study focuses on the effect of kevlar thread stitching in chopped GFRP composites with different orientation and pith distance. The experimentation started with 1-cm pitch distance was performed in the direction of longitudinal, transverse and both directions of laminated composites were subjected to three point flexural tests. The result revealed that the longitudinal direction stitching having better mechanical properties compared to transverse and both direction. Further, in longitudinal direction, 1-cm, 2-cm and 3-cm pitch distance of composites were subjected to three point flexural tests. The result inferred that the 3 cm pitch distance of stitching in laminates having better damage resistance and mechanical properties compared to other configurations.