ASTM A938 PDF

ASTM A and ISO address the requirements for simple torsion (twist) testing of metallic wire. Both testing standards require that a wire specimen be. This standard is issued under the fixed designation A ; the number 1 This test method is under the jurisdiction of ASTM Committee A01 on Steel,. Stainless . ASTM A covers torsion testing of wire. ASTM A provides knowledge of the ductility of a wire when under torsion loading. A torsional test machine with.

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Asm use cookies to improve your browsing experience. By continuing to use our site, you accept our cookie policy. Both testing standards require that a wire specimen be twisted about the longitudinal axis until it fails. Upon failure, the number of turns should be asfm. Additionally, some labs want to know the torque required for specimen failure and would also like to see a plot of torque versus the number of turns for the entire test.

This plot will show where the wire yielded during the twist test, as well as the failure point and profile.

As the preferred solution for low-force torsion testing and component in-service simulation, the MT MicroTorsion Series test wires, fasteners, switches, and springs in the biomedical, automotive, and aerospace industries. Qstm Universal Software is built from the ground-up for touch interaction and an intuitive user experience.

ASTM A938 Torsional Test of Wire

Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest in seconds, enhanced data exporting: Users of previous versions of software such as Bluehill 2 and Bluehill 3 can easily upgrade to the newest version of Bluehill. Universal materials testing software for static hydraulic, electromechanical and torsion testing systems – WBB.

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ASTM A Torsional Test of Wire

Subscribe to Our Newsletters. Glossary of Materials Testing Terms. Contact Us View Accessories Catalog. Challenges The challenges of testing wire to these standards are: Gripping Maintaining the rate of turning Applying a constant tensile force Accommodating various specimen lengths Shielding against broken specimen fragments Automatic turn counting Measuring and plotting torque Instron Solution Gripping – Many common wire diameters can be gripped with standard drill style chucks.

Keyless chucks W-MT01 offer a toothed profile that helps reduce slippage. Keyed chucks W-MTB provide smaller diameter clamping. Lathe style chucks can be supplied for larger diameters and can also be modified to allow for clamping a wire with a 90 degree bend on the ends.

Speed of Twisting – The rate of testing can vary and both standards provide recommended ranges that are based on the wire diameter.

Axial Tensile Force – To prevent the wire from bending away from the axis of rotation, a small tensile load is required to keep the specimen straight during testing. Our MT1 and MT2 torsion test systems offer an axial preload assembly that provides a constant axial force and can be adjusted for different size specimens.

Specimen Lengths – Instron’s MT torsion testers feature an adjustable tailstock assembly that allows for easy adjustment of the test opening. Guide rails enable the assembly to move freely in the axial direction while a test is being performed.

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The MT torsion models are available with extended length if longer specimen lengths are required.

Tests cannot be run when the door is opened and the rugged Lexan shield helps protect the operator from broken specimen fragments that may be ejected during failure.

Total Turns Measurement – The total number of turns to fracture are directly measured by a digital rotary encoder and automatically recorded by the testing software. The real-time measurement data can also be plotted graphically during the test. The MT torsion systems are supplied with precision torque cells that can measure torque accurately down to 0. Torque versus Rotation plots are automatically generated during the test and indicate where the wire yields and fractures.

MicroTorsion Series As the preferred solution for low-force torsion testing and component in-service simulation, the MT MicroTorsion Series test wires, fasteners, switches, and springs in the biomedical, automotive, and aerospace industries. Bluehill Universal Brochure Bluehill Universal Software is built from the ground-up for touch interaction and an intuitive user experience.

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