Noncontact Determination of the Tensile Modulus
Determining mechanical part properties is mandatory for quality assurance to assure compliance with performance specifications. A frequently required property is the tensile modulus, which according to ISO 527-1 must be determined to an accuracy of 1 % at strains of 0.05 % and 0.25 % of the original gauge length. The noncontact VideoXtens HP video extensometer from Zwick GmbH & Co. KG, Ulm, Germany, can be is intended for this application.
Since the operator has no access to the components of the calibrated measuring system, the repeatability of measurements with the video extensometer is assured. Automatic recording of the initial gauge length and automatic mark detection contribute to the repeatability. Thanks to marking and measuring recommendations, the measurement results remain comparable. Video capturing records the test for viewing at a later time.
The VideoXtens HP features two high-resolution cameras; the Zwick array technology combines the overlapping fields of vision of these cameras into one large field of vision. Because the measurement is noncontact in nature, the system has no effect on the measured values. A tunnel with integrated lighting provides optimal illumination of the test specimen and reduces effects of the environment.
Hall 11, booth G40
ZwickRoell GmbH & Co. KG
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