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A study was conducted to investigate the failure characteristics of thermoplastic composite graphite/polyetheretherketone (Gr/PEEK) at 250°F (121°C). The stacking sequences of specimens used in the study were [0°]16, [90°]16, [±45°]45, and [0°/±45°/90°]2s. Specimens of the first three ply layups, namely, [0°]16, [90°]16, and [±45°]4s were used to determine the basic stress-strain data at 250°F (121°C). In addition, specimens containing a hole (one-third diameter-to-width ratio) corresponding to all the four stacking sequences were manufactured to determine the stress-strain response, the progression of failure, and ultimate tensile strengths. Testing the specimens with ply layups of [±45°]4s and [0°/±45°/90°]2s containing ±45° plies was complicated by the development of high strains, thereby causing the strain gages to peel off during tests.
Professor, Air Force Institute of Technology, Wright-Patterson Air Force Base, OH
Robins Air Force Base, GA
Aerospace engineer, Structural Concepts Branch, Structures Division, Wright Laboratory, Wright-Patterson Air Force Base, OH
Stock #: CTR10220J