109 / 352
105
4.2.7. Analysis of crack growth data
The two major aspects of FCGR test analysis are to ensure suitability of the test data and
to calculate growth rates from the data. The analysis also may require the calculation of
fatigue crack closure level and the analysis of fracture surface and metallography. It is
essential that computer-controlled tests generate records of
a
vs.
N
and FCGR. It is
prescribed
to ensure the validity of the test data and make corrections to the crack length,
if necessary (ASTM E 647).
At the end of the test, the final crack length is measured on both sides of the specimen.
The error between the final measured and predicted crack size is linearly distributed over
the crack extension range. If periodic optical measurements were made during the test,
other more appropriate correction procedures can be used.
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