On the Dynamic Behaviour of Glass Fiber-Reinforced Plastic Pipe with ClampClamp Boundary Condition

Abstract

A comparative analysis of the responses of glass fiber-reinforced plastic
pipe and ductile iron pipe under dynamic excitation is presented in this
article. The aim of the investigation was to gain insights for possible
replacement of DI pipes with GRP pipes for some stringent applications.
The ANSYS FEA R19.0 was used to develop the finite element model
which used PIPE289 3-D 3-node element to achieve discretization of the
solution domain, to which a clamp-clamp boundary condition was
applied. The numerical simulation was performed on a duo-core, 8G
RAM computer with convergence achieved after 4mins of simulation
time. Simulation results of modal and harmonic analysis was validated
against results obtained from ref [23]. Six lateral vibration modes were
identified as significant for both pipes. The comparative analysis of the
performance of the different pipes showed that for same mode shape
numbers, GRP pipes experienced higher lateral deformation values and
higher modal frequencies. Harmonic frequency and von Mises stress
were higher for GRP pipe than DI pipe. A significant insight is that the
stress ratio for GRP pipe is only higher than DI pipe for the first four
modes. This suggests that GRP pipes of equivalent bursting strength as
the DI pipe will perform better at applications prone to higher excitation
frequencies.