STP345

    An Analysis of Strain Gage Measurements Under Transient Heating Conditions

    Published: Jan 1963


      Format Pages Price  
    PDF (220K) 11 $25   ADD TO CART
    Complete Source PDF (4.0M) 11 $55   ADD TO CART


    Abstract

    Serious errors are sometimes encountered in strain gage data when testing is conducted in transient heating environments. Variations in thermal gradients, temperature compensation, and monitor temperature sensor locations all contribute to the inaccuracies. The temperature of a strain gage wire is different (150 F with 100 F per sec heating rates) than that of the specimen surface under or adjacent to the gage. Strain gages respond faster to a step-function heat input than do thermocouples; resistance thermometers respond at about the same rate as strain gages. Theoretically, a quartz-compensated strain gage, when installed with adequate temperature sensors and when properly calibrated, will result in more accurate data because the strain gage output is independent of the grid wire temperature.


    Author Information:

    Johnson, Curtis E.
    Research Engineer, Structures Laboratories, The Boeing Co., Seattle, Wash.


    Paper ID: STP45099S

    Committee/Subcommittee: F07.06

    DOI: 10.1520/STP45099S


    CrossRef ASTM International is a member of CrossRef.