Bulge-Test according to ISO 16808

During the hydraulic bulge test in accordance with ISO 16808, the sheet metal to be tested is clamped and can be formed without friction with the aid of the drawing piston, which presses upwards against the oil.

The thicker the sheet metal and the higher the strength of the material, the higher the drawing force required to form the sheet metal. The required sheet holding force also increases because the sheet must be held securely in the circumferential bead.

Beschreibung des Bulge-Tests nach ISO 16808

Test method

The sheet specimen (2) is fixed between the drawing die (1) and the sheet holder (3). There is an oil chamber (4) under the specimen. The sheet is clamped and can now be formed (without friction) with the help of the drawing piston (5), which presses upwards against the oil.

Test principle of the bulge test according to ISO 16808

Parameters

Only five selected reference points on the sheet are relevant for determining the parameters (see top view and side view on the left), which are used to calculate the crest radius and the crest height.

ERICHSEN Testing Equipment

ERICHSEN Sheet Metal Testing Machines are suitable for a large number of forming tests (Erichsen cupping tests, Deep drawing tests, Bulge tests, FLC tests, etc.).

More information