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.


     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:

    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. 


    The results can be expressed numerically or graphically.

    The gauge factor is dimensionless and is expressed as follows,

    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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