ASTM E251 Performance Characteristics of Metallic Bonded Resistance Strain Gauges

The standard test methods for determining various performance characteristics of strain gauges are covered in ASTM E251. These test methods provide the information that must accompany strain gauges if they are to be used with acceptable accuracy of measurement.... Read More

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    Scope:

    The ASTM E251 standard defines test methods for the evaluation of a strain gauge’s performance characteristics. This standard includes testing equipment designs. Standard test methods E251 describes procedures for determining five strain gauge parameters:

    ParameterSection
    Resistance at a Reference Temperature8
    Gauge factor at a Reference Temperature9
    Temperature Coefficient of Gauge Factor10
    Transverse Sensitivity11
    Thermal Output12

    These test methods do not cover bonded resistance strain gauges used in transducers as sensing elements. 

    Video 01: Working, types, and applications of strain gauges

    Results:

    In ASTM E251, the results can be expressed numerically or graphically.

    The gauge factor is dimensionless and is expressed as follows,

    where:
    K = the gauge factor,
    R = the strain gauge’s resistance at test strain,
    Ro = the strain gauge’s resistance at zero or reference strain,
    L = the test structure length under the strain gauge at test strain,
    Lo = the test structure length under the strain gauge at zero or reference strain,
    ΔR = the change in the strain gauge’s resistance when strain is changed from zero (or reference strain to test strain),
    ε = the mechanical strain L-Lo / Lo.

    Conclusion:

    The ASTM E251 standard defines test methods for the evaluation of a strain gauge’s performance characteristics. 
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