Good ductility tests are in great demand for thin sheet. Typical forming procedures such as deep drawing and stretch forming are characterized or investigated in standardized test methods, for which Zwick supplies Type BUP testing machines, with drawing forces up to 1000 kN. An important but complex test is the determination of the forming limit curve, from which designers can
derive limit strains which should not be exceeded during forming processes. The optical measurement technology required for recording strains during the drawing process is produced in collaboration with Zwick’s specialist partners.