ASTM E517 & E646, Sheet Steel, R&N Testing with Video Extensometer
Sheet metal testing applications 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. They need to allow for enough travel to test the specimens through break, but small gauge lengths make it more challenging to ensure high accuracy of the measurements. Additionally, relevant ASTM and ISO testing standards have accuracy requirements that must be achieved.
Historically, video extensometry is not frequently used in these applications, as most customers in the metals industry prefer traditional contacting extensometers and trust the reliability of the results. Significant advances in the technology of video extensometry offer metals testing customers other options, such as our Advanced Video Extensometer (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 has been shown to increase productivity and simplify testing. In addition, the AverEdge32™ feature has shown substantial improvement in reducing transverse strain measurement variability.
The purpose of this test is to demonstrate the accuracy and reliability of the AVE 2 for testing steel specimens. For this test, 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® Universal materials testing software.
AverEdge32 is an optional advanced feature of Instron’s AVE 2 non-contacting extensometer. Standard extensometers with a single local transverse strain measurement can exhibit stepped changes in transverse strain data, making it challenging to obtain an accurate value. AverEdge32 measures transverse strain at multiple locations along the specimen edges and averages them to produce a smooth and repeatable value, which is essential when calculating the r-value of sheet metal.
- 1.3 MB
The second generation Advanced Video Extensometer (AVE 2) utilizes patented measurement technology in the fastest, most accurate non-contacting strain measurement device commercially available.
- 1.4 MB
Instron 6800 Series Universal Testing Systems provide unparalleled accuracy and reliability. Built on a patent-pending Operator Protect system architecture with an all-new Smart-Close Air Kit and Collision Mitigation features, the 6800 Series makes materials testing simpler, smarter, and safer than ever before.
- 3.2 MB
Catálogo do Bluehill Universal em PT-BR
- 2.6 MB