ABSTRACT
In this research, the vibration analysis and stability of angled pipe has been investigated; two straight pipes made from composite
material connected by elbow; with fixed-fixed ends conveying fluid has been used, using three dimensional finite element model.
The characteristic matrices consisting of stiffness, inertia and damping terms which derived by finite element method and the
effect of the internal flow velocity, axial force and Coriolis force are considered. Some parameters that influence the dynamic
properties have been studied such as pipe angle, diameter ratio and wall pipe thickness. It was found that the composite material
increase the properties of the frame pipes; such as fluid velocity and frame frequency; and this increasing continuously with
increase the volume fraction of composite material, and the increase in frame angle led to decrease the critical flow velocity of the
frame pipes, also the increase in the length pipes ratio decrease the critical velocity of flowing. Finally, the frame frequency
decreases as the frame angle increase.
KEYWORDS: curved pipe, composite materials, conveying fluid, angle of spring location, straight pipe, critical velocity,
coriolis force.