Forming Limit Diagram Determinations


Our lab has the capability to determine the forming limit diagram for sheet steels. In addition to standard test methods using the four-inch dome test or Marciniak cup test, an eight-inch stretch dome test (pie pan) is also available in the lab. An automatic strain measurement device can read the surface strain with an accuracy of 0.5%.

• Experimental FLDs (see example above) are used to define forming limits in sheet metal stamping

• Experimental points are approximated with an equation (see FLC-TH curve) which is used later in both the FEA forming feasibility assessment and in the strain analysis during die try out