ASTM F2516-14 Tensile Testing Nitinol Wire
Nitinol is a shape memory, super-elastic alloy that is used extensively in the biomedical industry. For example, Nitinol is used in stents, dental wires, catheter guidewires, internal fracture fixation devices, and biopsy forceps. ASTM F2516-14 requires an extensometer of Class C or better to be used for wires with a diameter greater than 0.2 mm. The test method is designed to pull the material in tension to 6% strain, then unload the material to a value of less than 7MPa, before being pulled to failure.
The challenges of testing Nitinol wire to this standard are:
- Accurate strain measurement
- The weight of a clip-on extensometer may cause bending of the wire, and the knife-edges may slip, damage the wire, or lead to premature failure
- Secure gripping for varying specimen diameters
- Accurate turnaround points
Instron Solution:
- For wire with a diameter greater than 0.2 mm, we recommend using the Advanced Video Extensometer (AVE 2) or Automatic Contacting Extensometer (AutoX). Both the AVE 2 and AutoX are capable of measuring strain in cyclic loading and to failure without damaging the Nitinol wire.
- For thinner diameter wire, we recommend using pneumatic cord and yarn grips. For thicker diameter wire, we recommend using 5kN pneumatic side action grips with serrated faces.
- The 5900 controller and Bluehill® Universal software with the TestProfiler module allow for easy programming and real-time calculation of loading and unloading turnaround points. Instron provides a pre-configured test method for testing to ASTM F2516-14 in the Biomedical Applications Module.
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- 8/15/2013
- 1.4 MB