Effect of Crack Length Measurement Technique and Data Reduction Procedures on the Perceived Toughness from Four-Point Bend End-Notched Flexure Tests
- 1 July 2004
- journal article
- Published by SAGE Publications in Journal of Reinforced Plastics and Composites
- Vol. 23 (10), 1051-1062
- https://doi.org/10.1177/0731684404035413
Abstract
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 delamination toughness, GIIc, were evaluated for two different data reduction techniques. It was found that a technique using pretest compliance calibrations is the only approach that will produce accurate non-precracked and precracked values of GIIc regardless of the material being tested or the nature of crack advance. For those materials where GIIc values, as obtained by the more common approach that utilizes compliance values obtained during the test, agree with those obtained by compliance calibration, the results from the more common approach may be applied to obtain resistance curve toughnesses.Keywords
This publication has 4 references indexed in Scilit:
- Comparison of Delamination Characterization for IM7/8552 Composite Woven and Tape LaminatesPublished by ASTM International ,2003
- Evaluation of the accuracy of the four-point bend end-notched flexure test for mode II delamination toughness determinationComposites Science and Technology, 2000
- Mode II fracture toughness evaluation using four point bend, end notched flexure testPlastics, Rubber and Composites: Macromolecular Engineering, 1999
- Mode I and Mode II Delamination Growth of Interlayer Toughened Carbon/Epoxy (T800H/3900-2) Composite SystemPublished by ASTM International ,1995