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Loading Rate Effect on Interlaminar Fracture Toughness of a Thermoplastic Composite

A study was undertaken to investigate the loading rate effect on delamination fracture in itiation toughness of a thermoplastic composite. For this purpose, double cantilever beam specimens of graphite/PEEK were tested in a displacement controlled mode using an Instron tensile machine. Specimens were loaded at various crosshead speeds ranging from 0.05 cm/min to 100 cm/min. The interlaminar fracture toughness was found to decrease with increasing loading rate, and this decrease was up to 65 percent over the five decades of loading rate employed.