In the previous paper or elastic plastic analysis with experimental results for thick cylinder partially subjected to internal pressure in longitudinal direction, it was shown that the deformation, stress and yield strength of thick cylinderspartially subjected to internal pressure can be analyzed by a method based on thin cylinder theory determined and experimental results. In this work, the method is developed for application to analysis of tube expansion mechanisms using double thickcylinder theory and a theory of extended deformation of a tube due to pressure application from both sides. The numerical solutions obtained by this method agree well with the experimental results for double thick cylinders, and this method makes itpossible to analyze mechanisms of tube expansion in heat exchangers and elsewhere.
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