Characterization of Natural Fibre-Reinforced Composites with Advanced Ultrasonic Techniques

This paper presents an investigation of polypropylene composites reinforced with natural fibers (sisal, microfiber, and wheat straw) with ultrasonic methods. Results show a correlation between sound speed in composite and fiber content and water absorption. Fiber inhomogeneity and voids distribution were assessed with various ultrasonic imaging devices with different resolution. The obtained results justify the feasibility of using the …