Numerical Modelling and Analysis of the Behaviour of Composite Flanges Joints With Conical Collar

Abstract Glass fiber reinforced polymers, or GFRP, represents a kind of composite material being employed increasingly in different applications. It is frequently mixed with other materials to develop structures. Due to its excellent mechanical properties and resistance to chemical reactions, GFRP is used instead of metal pipes and bolted flanges in critical industrial sectors including the chemical, petroleum, and maritime industries. The application of GFRP in bolted flange assemblies has, however, been the subject of limited published research, making the design of these joints difficult for the lack of specific standards. The understanding of the implications for the reliability of these flanges is limited since existing standards do not provide guidelines for the construction of GFRP bolted flange assemblies. The modelling and finite element analysis of GFRP flange joints with a conical collar, according to ASTM D5421 and PS 15-69 standards, are the main purpose of this study. The NPS 4 and NPS 12 class 150 flange sizes were analysed to pinpoint the crucial components that need further consideration regarding to material selection, bolt tightening, sealing, and pressure limits. The stated purpose was to figure out the most crucial places and their accurate locations through evaluating the deformations and stresses in the flange, gasket, and bolts. The overall aim of this global analysis is to highlight weaknesses within the assembly, with a view to optimize the design and ensure the reliability of the bolted GFRP flange assemblies.