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The resistance method has been applied to graphite/epoxy composites. The method is based on the assumption that the damage growth at the crack tip can be modeled as a self-similar crack extension through compliance matching. Experimental data for center-cracked tension specimens reveal a linear relationship between crack-growth resistance and initial crack length. For the [0/±45]s laminate, the effective increment of crack length at fracture and the corresponding crack-growth resistance essentially are independent of initial crack length. The average amount of this crack extension in the [0/±45]2s and [0/±45]s laminates is higher than the values obtained from a best fit of fracture strength data reported in the literature. However, the present method results in an improved prediction of fracture strength for the [0/90/ ±45]s laminate.
composite materials, laminates, fracture tests, resistance method
Associate professor, Mississippi State University, Mississippi State, Miss.
Research engineer, University of Dayton Research Institute, Dayton, Ohio