Multi-scale infinite element analysis of GFRP pipe stiffness: effect of fibre volume fraction.

Abstract

This study employs a multi-scale finite element analysis (FEA) to investigate the mechanical behaviour of a Glass Fibre-Reinforced Polymer (GFRP) pipe under diametral compression. A Representative Volume Element (RVE) was used to generate homogenised material properties for three fibre volume fractions (FVF) of 30%, 55% and 70%. These properties were implemented in a macro-scale model of FRP ring tested as per ASTM D2412. Results demonstrate a significant positive correlation between fibre content, structural stiffness, and ultimate strength, validating the multi-scale approach and providing key insights for composite pipe design