CREEP BUCKLING OF OVALIZED TUBES UNDER EXTERNAL-PRESSURE

In order to get a better understanding of the role of various paramete rs on the creep collapse phenomenon of long circular tubes, an experim ental and numerical program has been undertaken. It mainly aims at stu dying the influence of the behavior of the material composing the circ ular tubes and their geometrical characteristics on the flattening tim e. This paper presents the results of numerical simulations performed with a specific computer program using an analytical approach. They ha ve been compared with the data obtained from creep tests performed in various conditions on preovalized tubes as well as with the solutions obtained from the finite element method. It is shown that a good agree ment is achieved between experimental results and calculation results.