ASTM F2516-06

Standard Test Method for Tension Testing of Nickel-Titanium Superelastic Materials

SIGNIFICANCE AND USE
Tension tests provide information of the strength and ductility of materials under uniaxial tensile stresses.
Tension tests, as described in this test method, also provide information on the superelasticity, as defined in Terminology F 2005, of the material at the test temperature.
SCOPE
1.1 This test method covers the tension testing of superelastic nickel-titanium (nitinol) materials, specifically the methods of determination of upper plateau strength, lower plateau strength, residual elongation, tensile strength, and elongation.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-May-2006
• ICS: 77.120.40 - Nickel, chromium and their alloys
• Technical Committee: F04 - Medical and Surgical Materials and Devices
• Drafting Committee: F04.15 - Material Test Methods

Relations

• Replaces: ASTM F2516-05 - Standard Test Method for Tension Testing of Nickel-Titanium Superelastic Materials
• Effective Date: 01-Jun-2006
• Replaced By: ASTM F2516-07 - Standard Test Method for Tension Testing of Nickel-Titanium Superelastic Materials
• Effective Date: 01-Dec-2007
• Referred By: ASTM F2514-21 - Standard Guide for Finite Element Analysis (FEA) of Metallic Vascular Stents Subjected to Uniform Radial Loading
• Effective Date: 01-Jun-2006
• Referred By: ASTM F2633-19 - Standard Specification for Wrought Seamless Nickel-Titanium Shape Memory Alloy Tube for Medical Devices and Surgical Implants
• Effective Date: 01-Jun-2006
• Referred By: ASTM F2005-21 - Standard Terminology for Nickel-Titanium Shape Memory Alloys
• Effective Date: 01-Jun-2006
• Referred By: ASTM E3098-17 - Standard Test Method for Mechanical Uniaxial Pre-strain and Thermal Free Recovery of Shape Memory Alloys
• Effective Date: 01-Jun-2006
• Referred By: ASTM E3097-23 - Standard Test Method for Uniaxial Constant Force Thermal Cycling of Shape Memory Alloys
• Effective Date: 01-Jun-2006

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F2516–06
Standard Test Method for
1
Tension Testing of Nickel-Titanium Superelastic Materials
This standard is issued under the fixed designation F 2516; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers the tension testing of superelas-
tic nickel-titanium (nitinol) materials, specifically the methods
of determination of upper plateau strength, lower plateau
strength, residual elongation, tensile strength, and elongation.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
standard.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E6 Terminology Relating to Methods of Mechanical Test-
ing
E8 Test Methods for Tension Testing of Metallic Materials
FIG. 1 Terms Illustrated on Typical Stress-Strain Diagram of
E83 Practice for Verification and Classification of Exten- Superelastic Nitinol
someter Systems
E 111 TestMethodforYoung’sModulus,TangentModulus,
3.1.1 lower plateau strength (LPS)—the stress at 2.5 %
and Chord Modulus
strain during unloading of the sample, after loading to 6 %
E 1875 Test Method for Dynamic Young’s Modulus, Shear
strain.
Modulus, and Poisson’s Ratio by Sonic Resonance
3.1.2 residual elongation, El [%]—the difference between
F 2005 Terminology for Nickel-Titanium Shape Memory r
the strain at a stress of 7.0 MPa during unloading and the strain
Alloys
at a stress of 7.0 MPa during loading.
3. Terminology
3.1.3 uniform elongation, El [%]—the elongation deter-
u
mined at the maximum force sustained by the test piece just
3.1 Definitions—The definitions of terms relating to tension
prior to necking, or fracture, or both.
testing appearing in TerminologyE6 and the terms relating to
3.1.4 upper plateau strength (UPS)—the stress at 3 % strain
nickel-titanium shape memory alloys appearing in Terminol-
during loading of the sample.
ogyF 2005shallbeconsideredasapplyingtothetermsusedin
this test method.Additional terms being defined are as follows
4. Summary of Test Method
(see Fig. 1):
4.1 Using conventional tensile testing apparatus, the mate-
rial is pulled to 6 % strain, then unloaded to less than 7 MPa,
then pulled to failure.
1
This test method is under the jurisdiction ofASTM Committee F04 on Medical
and Surgical Materials and Devices and is the direct responsibility of Subcommittee
5. Significance and Use
F04.15 on Material Test Methods.
5.1 Tension tests provide information of the strength and
Current edition approved June 1, 2006. Published June 2006. Originally
approved in 2005. Last previous edition approved in 2005 as F 2516 – 05.
ductility of materials under uniaxial tensile stresses.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2 Tension tests, as described in this test method, also
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
provide information on the superelasticity, as defined in Ter-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. minology F 2005, of the material at the test temperature.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F2516–06
6. Apparatus 8.1.4.1 When using a clip-on extensometer with small
diameter wire, care must be taken not to bend or distort the
6.1 Apparatus is as described in Test MethodsE8.
wire when attaching the extensometer.
8.1.5 Upper plateau strength shall be determined by the
7. Test Specimen
stress at a strain of 3.0 % during the initial loading of the
7.1 Test specimens are as described in Test MethodsE8.
specimen.
8.1.6 Lower plateau strength shall be determined by the
8. Procedure
stressatastrainof2.5 %duringtheunloadingofthespecimen.
8.1 Procedure shall be per Test Methods E8 with the
8.1.7 Residual elongation shall be determined by the differ-
following additions:
ence between the strain at a stress of 7.0 MPa during unloading
8.1.1 Unless otherwise specified, temperature of test shall
and the strain at a stress of 7.0 MPa during loading.
be 22.0°C. Tolerance shall be 62.0°C.
8.1.8 The uniform elongation shall be determined by elon-
8.1.2 Free-running crosshead speed shall be limited per
gation when the maximum load
...