Influence of fiber orientation on self-heating during fatigue of polymer matrix composites under low and ultrasonic cyclic frequencies

Short summary

Self-heating in polymer composites under fatigue is significantly higher at ultrasonic (20 kHz) vs. low (40 Hz) frequencies, with heat dissipation rates increasing by an order of magnitude (10^5 to 10^6 J m^-3 s^-1). This study distinguishes damage-related heat from internal friction, revealing damage-related heat drives fatigue life reduction, especially in off-axis orientations under shear.

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