Abstract
As a result of experimental studies of the composite pressure vessel with load-shearing metallic liner during the unloading and cyclic-loading processes, the deformation of structure is nonlinear [1,2]. A method for purpose of describing and analyzing residual stress and strain in the cylindrical part of a composite pressure vessel type 3 after autofrettage is developed, which is based on the linear-elastic model of the fibrous composites and the relations of the theory of plasticity with translational hardening for isotropic material [3]. The theoretical results obtained from constitutive equations are written in matrix form and fit the experimental data well. In comparison, the results based on finite element method and classical Prandtl-Reuss flow rule are proposed. The results show that it is necessary to consider the plastic deformation in metallic liner of composite pressure vessel type 3 when analyzing the stress-strain state.
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