Cupping test The earliest tests developed to predict formability of sheet metal were cupping tests, namely, the Erichsen tests.
{"Image DocumentName": "Cupping test The earliest tests developed to predict formability of sheet metal were cupping tests, namely, the Erichsen tests.", "Image ImageDescription": "In the Erichesn test, a sheet-metal specimen is clamped over a flat die with a circular opening and a load of 1000 kg. A 20 mm diameter steel ball is then hydraulically pressed into the sheet until a crack appears on the specimen. The distance d, in mm, is the Erichsen number. The greater the value of d the greater is the formability. Simple to perform. Approximate indicator of formability. Do not simulate exact conditions of actual operations, WHY? Because the stretching under the ball is axisymmetric, they do not at all simulate the exact conditions of actual forming operations. Erichsen test. d = Erichsen number.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}