Interlaminar Fatigue Crack Growth in a Thermoplastic-Matrix Fiber Composite at Room and Elevated Temperatures
NATIONAL CENTER FOR COMPOSITE MATERIALS RESEARCH URBANA IL
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A study on the interlaminar fatigue crack growth behavior in a thermoplastic matrix composite at both room elevated temperatures is presented. Experiments are conducted on an AS4-graphite fiberpolyamide J1 resin composite system. Details of interlaminar crack growth are studied, using double- cantilever beam DCB composite specimens under displacement controlled cyclic loading. Governing fracture mechanics parameters, GImax GImin and GI delta during fatigue, are determined from a geometrically nonlinear analysis of the DCB experiment. The interlaminar fatigue experiments, conducted at room and elevated temperatures up to the glass-transition temperature of the resin matrix, reveal that crack growth in the composite follows the Paris type power- law equation at all test temperatures. The exponent n of the power-law expression remains relatively constant at temperatures below the glass- transition of the matrix resin.
- Laminates and Composite Materials