Theoretical And Experimental Analyses Of Thermal Buckling And Postbuckling Problem Of Liner Shells In Elastic And Plastic Range Respectively

Kenter's asymptotic analysis theory of the initial postbuckling is used to analyse the postbuckling behavior and the effect of imperfection in the shape of the buckling mode for three liner shell models, i.e., four points stud supported liner shell, clamped liner shell and five points stud supported liner shell. The expresses of the postbuckling equilibrium paths and the buckling critical temperature loads for the perfect and imperfect liner shells are obtained, the liner's postbuckling stability is also proved.Considering the effect of temperature, generalized variation principle expressed with stress function F and transverse displacement W for shallow shells is calculated, and based on this,nonlinear method is used to obtain the postbuckling equilibriumpaths of liner shells.Based on Hill's general theory of uniquess and bifurcation in elastic-plastic solids, the governing equations of the plastic bifurcation for the liner shells are generated.An experimental research is carried out to obtain data on buckling loads for one to one local models of the 200MW RCCV. The buckling loads obtained by experimental analyses are in good agreement with those obtained by theoretical analyses.