Effect of Crack Length Measurement Technique and Data Reduction Procedures on the Perceived Toughness from Four-Point Bend End-Notched Flexure Tests

Results are presented from a study to determine the most appropriate crack length measurement and data reduction techniques for use with the four-point bend end-notched flexure test. Using two different graphite/epoxy materials, the variability in crack length measurements due to different observers and/or measurement techniques, including visual observation and ultrasonic inspection, and their effects on the perceived values of the mode II...