...Chen Yang; Gracious Ngaile A two-stage preforming process based on wrinkle formation is developed for the tube hydroforming process to accumulate material in the forming zone, thus reducing the thinning rate and improving the formability. In preforming stage one, the wrinkle onset is triggered...

... levels. 19 05 2004 26 08 2004 carbon nanotubes permeability gas lasers laser ablation scanning electron microscopy atomic force microscopy transmission electron microscopy furnaces nanotechnology preforms Carbon nanotubes have extraordinary thermal, mechanical...

...Chensong Dong In this paper, a permeability measurement method using hybrid fiber preforms is presented. The hybrid fiber preform can be composed of different fiber mat types, different numbers of fiber mats of the same type, or both. The computational procedure for permeability based on flow front...