A method of calculating the stress-strain state of multilayer flexible polymeric-metallic pipes loaded by internal pressure is set forth; it is based on the nonlinear theory of multilayer anisotropic shells. A comparison is made between computed results obtained with and without allowance for the nonlinearity of multilayer flexible polymeric-metallic pipes of high and low radial stiffness. It is established that for flexible pipes of high radial stiffness, which contain one or several frames, the results of strength calculations for an axisymmetric load in accordance with the linear and nonlinear theories are in virtual agreement. The effect of the structural parameters of the frame and longitudinal-bearing components on the bearing capacity and longitudinal flexibility of multilayer flexible polymeric-metallic pipes is demonstrated.
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