This accessory for WP 300 makes it possible to investigate the material properties of thin sheet metal. To do this, the specimens are deformed in practice-oriented cupping experiments and then examined.
The accessory contains a punch, a hold-down clamp, a die and a mirrored cylinder for analysing the specimen. The assembled test device is installed in the compression area of the WP 300 experimental unit, between bottom crossbar and crosshead.
A thin sheet metal specimen is clamped between the die and the hold-down device.
The specimen in then deformed until it cracks by means of a spherical drawing punch. The mirror allows you to observe the specimen from below and to see exactly when the crack starts. Thin sheet metal with a thickness up to 2mm can be studied with the device.
The depth achieved in mm is defined as a standard of comparison for cold formability. In addition, the type of the rupture and the surface structure of the sagging area are analysed.
A set of specimens is included to carry out experiments. The set contains five specimens each of aluminium, copper, brass and steel.
