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The Determination of Fatigue Crack History from
A Two Stage Plastic Replication Technique
Evaluation of Fatigue Damage by Optical Holography
17 other sections not shown
a. c. field acoustic microscope aluminium alloy analysis ASTM calculated calibration curve changes characterisation chord defect compact tension constant correlation intensity corrosion fatigue crack depth crack extension crack front crack growth rate crack initiation crack length measurement crack opening crack sizes crack surface crack tip da/dN defect geometries determined diffracted displacement effect electrical potential electron environment experimental fatigue crack growth fatigue test finite element fracture mechanics fracture surface frequency geometry increase induction effect input lens load cycle long crack longitudinal wave material Measurement of Crack ment metal microcracks microstructure monitoring notch nucleated observed obtained optical optical correlation P. D. method plastic potential drop predicted probe ratio Rayleigh wave reflection coefficient short crack shown in Fig shows signal slot small crack small fatigue cracks steel strain strain gauge stress amplitude stress intensity factor striations superalloys surface crack testpiece transducer ultrasonic voltage