JIS Z2254 and Z2253, R and N Value of Sheet Steel using a Video Extensometer
The Japanese Standards Association promotes JIS test standards for sheet metal testing applications which require calculations such as yield strength, yield point elongation, ultimate tensile strength, plastic strain ratio ('r' value) and the strain hardening exponent ('n' value). These calculations place a high physical demand on traditional contacting extensometers for measuring axial and transverse strain to allow for enough travel to test the specimens through break, but small enough gauge lengths to ensure high accuracy in measurements. Additionally, relevant JIS, ASTM and ISO testing standards have accuracy requirements that must be achieved.
We have found that video extensometry is not frequently used in these applications, as most customers in the metals industry use traditional contacting extensometers and trust the reliability of the results. Developments in the technology of extensometry offer metals testing customers other options, such as our Advanced Video Extensometer 2 (AVE 2). Not only does this solution allow for simultaneous collection of axial and transverse strain data, and reduce the maintenance required for wear and tear on knife-edges, it may also increase productivity and simplify testing. The purpose of this test is to demonstrate the accuracy and reliability of the AVE for testing steel specimens. We used our 5982 universal testing system, with a 10 kN load cell and 50 kN wedge grips with serrated faces. We captured the test results with our Bluehill® materials testing software.
5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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5980 floor models are heavy-duty universal testing systems commonly used for testing high-strength metals and alloys, advanced composites, aerospace and automotive structures, bolts, fasteners, and plate steels. They are capable of testing up to 600 kN.
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Bluehill Universal Software is built from the ground-up for touch interaction and an intuitive user experience. Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest in seconds, enhanced data exporting: and Instron Connect – a new feature that provides a direct communication link to Service. Users of previous versions of software such as Bluehill 2 and Bluehill 3 can easily upgrade to the newest version of Bluehill.
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