Abstract
The aim of the paper is to present a theoretical analysis of the elastic-plastic bending of tube. Analytical methods are given whereby approximate equations are derived to provide a quantitative method for predicting the spring back behaviour and residual stress distributions. Comparisons between experimental and theoretical results of spring back have shown remarkable agreement. Also, a special technique for the bending of thin-walled tubes using a flexible mandrel of elastomer rod, within the `Doubtful Bend Region ρ 0/2 R< 1.7' is presented. The elastomer is employed as an internal pressure transmitting medium in the bending process. Theoretical analysis based on the upper-bound approach for predicting the required bending load is also presented. Generally, it is found that the theoretical results for the bending loads are in good agreement with experimental values. Both experiments were performed on materials with different work hardening characteristics. Various parameters associated with these techniques are also examined.
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