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A review is made of procedures, developed at the National Aeronautical Laboratory for fatigue crack propagation testing under flight spectrum loading. They include K-control and on-line spectrum editing that were found to have a significant impact on spectrum load testing. Techniques are described for unambiguous assessment of crack closure stress and for binary-coded marker loading.
fatigue crack, spectrum loading, K, -control, dK/da, net stress, on-line spectrum editing, binary-coded loads, fatigue (materials), testing
Scientist, National Aeronautical Laboratory, Bangalore,