ASTM E251-92 Performance Characteristics of Metallic Bonded Resistance Strain Gauges

ASTM E251-92 Performance Characteristics of Metallic Bonded Resistance Strain Gauges

The standard test methods for determining various performance characteristics of strain gauge are covered in ASTM E251-92. These test methods provide the information that must accompany strain gauges if they are to be used with acceptable accuracy of measurement.

    Scope:

     The ASTM E251-92 standard defines test methods for the evaluation of strain gauge 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. 

    Results:

    The results can be expressed numerically or graphically.

    The gauge factor is dimensionless and is expressed as follows,

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