Affiliation:
1. Chengdu Aeronautic Polytechnic
Abstract
<div class="section abstract"><div class="htmlview paragraph">Bimetal composite pipe has higher strength and is more corrosion and high
temperature resistant compared to single metal pipe, making it a new type of
pipe that is being gradually applied to important industrial fields such as
aviation and aerospace manufacturing. To study the hydraulic forming mechanism
of bimetal composite pipes, the forming process is divided into three stages:
liner pipe elastic–plastic deformation, base pipe loading, and unloading. The
stress and strain relation between the liner and base pipe during the gradual
increase in hydraulic pressure is analyzed, and the range of selected internal
pressure required for composite pipe formation and the relation between residual
contact pressure and internal pressure for the liner–base pipe interface are
obtained. The accuracy of analytical predictions for the contact pressure and
the axial and circumferential strains on the outer wall of the base pipe during
the forming process is verified through numerical simulation and composite pipe
forming experiments. Through this analysis, the appropriate internal pressure
for forming can be selected and the residual contact pressure between the layers
can be effectively regulated to ensure quality formation of composite pipes,
depending on different materials and working conditions. Effective guidance for
production practices can be provided by theoretical analysis and numerical
simulation during the development of bimetal pipe composite process.</div></div>