Interlaminar stresses in Glass-Cellulose Epoxy L Bend Hybrid Composites

Huge inter laminar stresses are induced in complex geometry of composite structural joints, for example, those utilized as a primary part of the aircraft structures. An inverted V shaped open mould covered with top plate was used to make L shaped complex geometries using unidirectional (UD) Glass with small amount of Cellulose as fillers at the curvature region in L shaped UD Glass and epoxy composites. But an understanding of the achieved mechanical property is required to improve the technology further and introduced it into industry. Initially tensile test was carried out to know the elastic modulus in the direction of 0⁰ and 90⁰ of UD Glass epoxy composite laminates followed by a four-point bend test was conducted on various L shaped specimen as per ASTM D6415 standard. The experimental results revels that the L shaped specimen made with 7.5wt% of Cellulose fillers in UD Glass gave higher inter-laminar stresses with respect to pristine UD Glass epoxy composite. Further, it is noticed that the UD Glass Cellulose epoxy composite showing increased fiber bridging at the curvature during loading. Finally, it is observed that an improved delamination in L bend composite specimen is achieved by incorporating Cellulose in UD Glass epoxy composite system.