Dynamic Response Analysis of Composite Pipes Conveying Fluid in the Presence of Internal Wall Thinning

Pipes conveying fluids are primary components in almost all industries. Internal surface attack is inevitable in pipes and can be crucial to their structural integrity and dynamic response characteristics. In this study, the dynamic response analysis of composite pipes with internal surface discontinuity is investigated in the presence of fluid flow. The equations of motion are obtained using the extended Hamilton's principle and discretized using the wavelet-based finite-element method (WBFEM). The internal surface defect is allowed to occupy any length along the pipe span, while its cross section can vary both in radial and angular directions. The dynamic response of the defected pipe is obtained by integrating the equations of motion forward in time using MATLAB solver ODE45. The developed dynamic model has been validated using ANSYS and some benchmark results are presented to underline the influence of the internal surface defect on dynamic response of composite pipes conveying fluid.