A dedicated CBT machine was designed and fabricated at the University of New Hampshire (UNH) for the
evaluation of formability of automotive aluminum alloy sheet and even advanced high strength steels. There are five
components to this device (Fig. 4): 1) a hydraulic cylinder to apply the tension to the specimen, 2) a movable
carriage that contains the specimen, hydraulic cylinder and grips, 3) an assembly of 3 rollers, 4) a ball screw to
traverse the carriage (and thus gage length) past the stationary roller assembly to create the CBT process, and 5) a
data acquisition system which collects process parameters, i.e., the axial load on the specimen and the displacement
of the cylinder