Viscoelastic Solutions and Investigation for Creep Behavior of Composite Pipes under Sustained Compression

Composite pipes, which are widely used for transporting fluids, have a high strength, good impermeability and strong resistance to external pressure. Because the pipe bears sustained load, its constituent materials usually possess time-dependent properties, creep phenomenon unavoidably occurs in composite pipes long run. The aim of this study is propose analytical viscoelastic solutions, then applied structure explore behavior under compression. layers bonding interlayer both exhibit novelty study. governing equations built on basis exact elasticity theory combined with theory. General solutions derived by means Fourier series expansion coefficients further determined Laplace transform. research results indicate that present solution has higher computational efficiency than finite element solution, because latter involving time discretization method. In addition, pipe, if modulus degradation neighboring laminar proportional, stresses can keep constant time, as purely elastic material.