If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass
    ASTM E2368 - 10(2017)

    Standard Practice for Strain Controlled Thermomechanical Fatigue Testing

    Active Standard ASTM E2368 | Developed by Subcommittee: E08.05

    Book of Standards Volume: 03.01

      Format Pages Price  
    PDF 10 $54.00   ADD TO CART
    Hardcopy (shipping and handling) 10 $54.00   ADD TO CART

    Historical Version(s) - view previous versions of standard

    Work Item(s) - proposed revisions of this standard

    Translated Version(s): Russian

    ASTM License Agreement

    Shipping & Handling

    More E08.05 Standards Related Products Standard References

    Significance and Use

    4.1 In the utilization of structural materials in elevated temperature environments, components that are susceptible to fatigue damage may experience some form of simultaneously varying thermal and mechanical forces throughout a given cycle. These conditions are often of critical concern because they combine temperature dependent and cycle dependent (fatigue) damage mechanisms with varying severity relating to the phase relationship between cyclic temperature and cyclic mechanical strain. Such effects can be found to influence the evolution of microstructure, micromechanisms of degradation, and a variety of other phenomenological processes that ultimately affect cyclic life. The strain-controlled thermomechanical fatigue test is often used to investigate the effects of simultaneously varying thermal and mechanical loadings under idealized conditions, where cyclic theoretically uniform temperature and strain fields are externally imposed and controlled throughout the gage section of the specimen.

    1. Scope

    1.1 This practice covers the determination of thermomechanical fatigue (TMF) properties of materials under uniaxially loaded strain-controlled conditions. A “thermomechanical” fatigue cycle is here defined as a condition where uniform temperature and strain fields over the specimen gage section are simultaneously varied and independently controlled. This practice is intended to address TMF testing performed in support of such activities as materials research and development, mechanical design, process and quality control, product performance, and failure analysis. While this practice is specific to strain-controlled testing, many sections will provide useful information for force-controlled or stress-controlled TMF testing.

    1.2 This practice allows for any maximum and minimum values of temperature and mechanical strain, and temperature-mechanical strain phasing, with the restriction being that such parameters remain cyclically constant throughout the duration of the test. No restrictions are placed on environmental factors such as pressure, humidity, environmental medium, and others, provided that they are controlled throughout the test, do not cause loss of or change in specimen dimensions in time, and are detailed in the data report.

    1.3 The use of this practice is limited to specimens and does not cover testing of full-scale components, structures, or consumer products.

    1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.5 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

    E3 Guide for Preparation of Metallographic Specimens

    E4 Practices for Force Verification of Testing Machines

    E83 Practice for Verification and Classification of Extensometer Systems

    E111 Test Method for Youngs Modulus, Tangent Modulus, and Chord Modulus

    E112 Test Methods for Determining Average Grain Size

    E220 Test Method for Calibration of Thermocouples By Comparison Techniques

    E337 Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)

    E467 Practice for Verification of Constant Amplitude Dynamic Forces in an Axial Fatigue Testing System

    E606 Test Method for Strain-Controlled Fatigue Testing

    E1012 Practice for Verification of Testing Frame and Specimen Alignment Under Tensile and Compressive Axial Force Application

    E1823 Terminology Relating to Fatigue and Fracture Testing

    ICS Code

    ICS Number Code 19.060 (Mechanical testing)

    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/E2368-10R17

    Citation Format

    ASTM E2368-10(2017), Standard Practice for Strain Controlled Thermomechanical Fatigue Testing, ASTM International, West Conshohocken, PA, 2017, www.astm.org

    Back to Top