BUP sheet metal testing machines
The earing test on metals (ISO 11531) or aluminum/aluminum alloys (DIN EN 1669) is a method used for the determination of sheet metal forming properties.
The test is used to determine ear formation through punching followed by deep drawing of sheet metal blanks or strips into cylindrical, hollow formations.
After drawing the cup, the earing tendency is determined. The average height of the ear peaks and valleys is measured, followed by a calculation of the ear height as a percentage. This also is why the test is referred to as earing test.