Superplastic forming simulation of RF detector foils

Complex-shaped sheet products, such as R(adio) F(requency) shieldings sheets, used in a subatomic particle detector, can be manufactured by superplastic forming. To predict whether a formed sheet is resistant against gas leakage, FE simulations are used, involving a user-defined material model. This model incorporates an initial flow stress, including strain rate hardening. It also involves strain hardening and softening, the latter because of void formation and growth inside the material. Also, a pressure-dependency is built in; an applied hydrostatic pressure during the forming process postpones void formation. The material model is constructed in pursuance of the results of uniaxial and biaxial experiments