Interfacial and Nondestructive Evaluation of Natural Fiber Composites by Micromechanical and Acoustic Emission Techniques

摘要

The interfacial shear strength (ISS) of environmental friendly natural fiber-reinforced polymer composites plays a very important role in controlling the overall mechanical properties. In this work, the ISS of various ramie and kenaf fibers/epoxy systems were evaluated using a combination of the micro-mechanical test and nondestructive acoustic emission (AE) to dicover an optimal condition in accordance with the final purpose. In addition, mechanical properties of the natural fibers were investigated using the single fiber tensile test and analyzed statistically by both uni- and bimodal Weibull distribution. Microfailure modes of different natural fiber structures were observed using an optical microscope and determined indirectly by AE and their FFT analysis.