The investigation covers a flat strip bent into a circular ring and a cylindrical drum expanding inside the ring. The resulting anticlastic deformations of the strip and the contact patterns are representative of a flat strip being bent around a rigid, frictionless, cylindrical drum and then put under tension. The analysis shows that three contact patterns are possible and their respective regions are delineated in terms of the geometric and tension parameters. Expressions for anticlastic deformations and some numerical solutions are also presented.

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