Molybdenum strip test experiments and simulations at various temperatures to determine friction coefficients.

• The friction coefficient of molybdenum strip in contact with steel tool was tested. • Molybdenum specimens were tested by various temperatures and drawbead heights. • Higher temperatures reduced measured forces and increased the friction coefficient. • Molybdenum deep drawing is possible by lower temperatures without vacuum. The aim of the presented study was to perform the strip test of 0.5 mm thick molybdenum strip specimens by various simulated drawbead heights from 2 mm up to 6 mm and various temperatures from 20 °C up to 320 °C to obtain friction coefficients between the molybdenum strip and steel cylinders built-in the developed test device simulating the drawbead. The friction coefficients between the dry and lubricated molybdenum strip and the steel cylinders simulating the drawbeads were obtained by changing its value in the bilinear friction model and matching the holder drawing force and the drawbead restraint force curves achieved during the tests and the simulations. The increasing temperature of molybdenum strip led to reduced holder drawing force and drawbead restraint force and increased friction coefficient because of the decrease of molybdenum strip yield strength and the increase of surface contact between molybdenum sheet and the testing tool at elevated temperature. [ABSTRACT FROM AUTHOR]