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ISO 4965-1 1st Edition, July 15, 2012 Metallic materials - Dynamic force calibration for uniaxial fatigue testing - Part 1: Testing systems
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 4965 describes two methods (see Introduction)
for determining the relationship between the dynamic force range
(ΔFt) applied to a test-piece in a uniaxial,
sinusoidal, constant amplitude test and the force range indicated
(ΔFi) by the testing system.
These methods are applicable to dynamic testing systems
operating away from system resonant frequencies and are relevant to
testing systems where the dynamic force measurement errors are
either unknown or where they are expected to exceed 1 % of the
applied force range.
The dynamic force measurement errors are determined by
comparison of the peak forces indicated by the dynamic testing
system with those measured by the strain gauged dynamic calibration
device (DCD). This DCD has previously undergone static
calibrationagainst the testing system indicator.
For Method A (Replica test-piece method), the dynamic
calibration is applicable over the validated range of frequencies
for that type of test-piece only. A frequency-dependent correction
factor is applicable for the correction of dynamic force
measurement errors of up to 10 % of dynamic force range. By using
such a correction factor, the actual test-specimen dynamic force
measurement error will be reduced to less than 1 % of the dynamic
force range.
For Method B (Compliance envelope method), the dynamic
calibration is applicable over the range of test frequencies
validated for test-pieces whose compliance lies between those of
the two DCDs. No correction factor is applicable, as Method B does
not permit dynamic force measurement errors above 1 % of the
dynamic force range.
NOTE Annex A provides guidance on when the system should be
re-calibrated by the methods described in this part of ISO
4965.