IS 6886 : 1973 Method for dynamic force calibration of axial load fatigue testing machines by means of a strain gauge technique

1 Scope

1.1 This standard provides guidance for the dynamic forcecalibration of fatigue testing machines including specialattachments, such as, grips, which may affect the calibration ofthe machine. It deals exclusively with axial load machines in whichtest pieces, usually symmetrical about a longitudinal axis, aresubjected to fluctuating and reversed forces along that axis.

1.2 Whilst it is recognized that unsymmetrical specimens(components and structures), are sometimes tested, it is commonpractice to determine stresses within them from measurements bystrain gauges applied to the test specimens as required, and insuch cases dynamic force calibration of the machine may not benecessary.

1.3 The standard applies both to the calibration of new testingmachines by the manufacturer and to the verification of machines inservice. In the latter case, it may not be necessary to apply allthe procedures required for the overall calibration of a machine.

1.4 The calibration of special purpose machines and test rigsare not specifically covered in this standard but proceduressimilar to those described may be applied to suit particularapplications.

2 References

IS 2 :1960 Rules for rounding offnumerical values

IS 1828 : 1961 Method for load calibration oftesting machines fortensile testing of steel

IS 5074 : 1969 Methodof axial load fatigue testing of steel