Patent ID: 6148676
Filing Date: 2000-11-21
Classification: G01N

Abstract:
Method for material testing with a tensile testing device, comprising a first and a second fastening means for attachment of tensile testing specimen, pulling means for displacement of the fastening means relative to each other, means for strain measurement, means for measurement of tensile force, logical unit and presentation unit, said method comprising the steps of:attaching a tensile testing specimen by clamping its ends in a first and second fastening means, respectively, whereby the clamping is performed by a force independent of the force of the pulling means;displacement of the fastening means relative each other by applying a force by means of the pulling means;measuring of the tensile force applied at the fastening means by the pulling means;measuring of the strain of the tensile testing specimen, comprising measuring of the displacement of the fastening means relative to each other;collecting measurement results from the means for strain measurements and the means for measuring the tensile force by the logical unit;presenting measurement results at the presentation unit;contact-free measuring of the diameter of the tensile testing specimen, whereby the contact-free measuring of the tensile testing specimen is performed simultaneously as the displacement of the fastening means;presenting of the results of the contact-free measurement of the diameter of the tensile testing specimen together with the result of other results from the tensile testing at the presentation unit;determining of a maximum tensile stress and corresponding strain; andextrapolating and presenting of tensile force at fracture.