Nonlinear Finite Element Model of FRP Pipes Under Parallel Plate Loading Simulation

This paper presents the mechanical analysis of fiber-reinforced polymer (FRP) pipes subjected to parallel plate loading through finite element (FE) simulation. The outcome was compared to results from an experimental test conducted on a set of glass FRP (GFRP) and carbon FRP (CFRP) pipes with approximately the same geometry. The simulation employed a displacement-controlled approach, aligning with the ASTM D2412-11 standard loading method employed in the experimental testing program. The modeled GFRP and CFRP pipes measured 315 mm in width, while their internal diameters were 330 mm and 336 mm, respectively. The pipes had an approximate thickness of 4 mm. The FE model accounted for large deformations, resulting in simulation outcomes that showcased increased pipe stiffness as the cross-sectional geometry changed from circular to elliptical under loading. This mechanical response was consistent with the behavior of FRP pipes observed in the experimental study. Upon validating the FE model, the simulation output provided additional data not captured experimentally, including stress changes at the failure region and stress propagation within the pipe's cross section.