Method of obtaining FLD for using in simulation of metal forming by movable medi

Mechanical engineering

A combined numerical and experimental technique to obtain a Forming Limit Diagram of thin sheet metal for metal forming by movable media was developed. The technique is based on deforming sheet samples until failure by pressure of polyurethane into a variety of the elliptical dies. The required strain state is defined by the proportion of elliptical die window. Through-thickness strain of the sample near to a zone of failure or necking was measured, and major in-plane strains were obtained by finite-element simulation based on the known metal properties. The simplicity of measurements and the absence of a grid on the surface of the sample are the advantages of the suggested technique. Points of the Forming Limit Diagram for the specific thin sheet stainless steel where obtained.