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    ASTM E3098 - 17

    Standard Test Method for Mechanical Uniaxial Pre-strain and Thermal Free Recovery of Shape Memory Alloys

    Active Standard ASTM E3098 | Developed by Subcommittee: E08.05

    Book of Standards Volume: 03.01

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    Significance and Use

    5.1 This test method is used to measure a specimen's material and shape memory effect properties in response to a uniaxial deformation and then cycling through a full thermal transformation to recover all or a portion of the deformation. A material's martensite stiffness, martensite residual strain, austenite recovered strain, and unrecovered strain (or plastic deformation) after thermal cycling is determined.

    5.2 Measurement of the specimen's motion closely parallels many shape memory applications and provides a result that is applicable to the function of the material.

    5.3 This test method may be used for, but is not limited to, wire, round tube, or strip samples. It is able to provide an assessment of the product in its semi-finished form.

    5.4 This test method provides a simple method for determining transformation temperatures by heating and cooling specimens through their full thermal transformation after uniaxial pre-straining in the martensite state.

    5.5 This test method can be used on trained and processed material in a semi-finished form to measure Two Way Shape Memory Effect by comparing the strain in the austenite state and martensite states with no applied stress.

    5.6 This test method is useful for quality control, specification acceptance, and research.

    5.7 Transformation temperatures derived from this test method may not agree with those obtained by other test methods due to the effects of strain and stress on the transformation.

    5.8 Components such as springs or other semi-finished parts can be tested using this method as agreed upon by the customer and supplier. Units of stress and strain can be replaced with force and displacement.

    1. Scope

    1.1 This test method describes the heating and cooling a Shape Memory Alloy (SMA) specimen through transformation after uniaxial deformation to determine residual strain after loading and unloading, recovered strain on heating, total unrecovered strain upon cooling, and transformation temperatures.

    1.2 Units—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 appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    E4 Practices for Force Verification of Testing Machines

    E6 Terminology Relating to Methods of Mechanical Testing

    E8/E8M Test Methods for Tension Testing of Metallic Materials

    E9 Test Methods of Compression Testing of Metallic Materials at Room Temperature

    E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E74 Practice of Calibration of Force-Measuring Instruments for Verifying the Force Indication of Testing Machines

    E83 Practice for Verification and Classification of Extensometer Systems

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E209 Practice for Compression Tests of Metallic Materials at Elevated Temperatures with Conventional or Rapid Heating Rates and Strain Rates

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E1169 Practice for Conducting Ruggedness Tests

    E2368 Practice for Strain Controlled Thermomechanical Fatigue Testing

    F2004 Test Method for Transformation Temperature of Nickel-Titanium Alloys by Thermal Analysis

    F2005 Terminology for Nickel-Titanium Shape Memory Alloys

    F2063 Specification for Wrought Nickel-Titanium Shape Memory Alloys for Medical Devices and Surgical Implants

    F2082 Test Method for Determination of Transformation Temperature of Nickel-Titanium Shape Memory Alloys by Bend and Free Recovery

    F2516 Test Method for Tension Testing of Nickel-Titanium Superelastic Materials

    Other Standards

    ASQ C1 General Requirements for a Quality Program Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

    ICS Code

    ICS Number Code 77.120.99 (Other non-ferrous metals and their alloys)

    UNSPSC Code

    UNSPSC Code

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/E3098-17

    Citation Format

    ASTM E3098-17, Standard Test Method for Mechanical Uniaxial Pre-strain and Thermal Free Recovery of Shape Memory Alloys, ASTM International, West Conshohocken, PA, 2017, www.astm.org

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