FIELD: testing of sheet metal. SUBSTANCE: a boss is provided on one of the faces of the specimen working part, a hole is made in the specimen proper in the zone of the boss and fettling (shearing with the aid of a laboratory press die) of this boss before tension. The specimen working part is strain-hardened in the same way as at separating stamping. and the hole in the zone of the boss provides a failure in the test just in the strain-hardened part. Stamping capacity is estimated according to the strain characteristics in the zone of failure. EFFECT: enhanced precision of stamping capacity tests taking into account the influence of strain hardening of specimen faces arising in separating operations on the results of stamping in subsequent operations. 1 dwg
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