EVALUATION OF GLASS FIBER/POLYPROPYLENE COMPOSITES BY QUANTITATIVE LASER ULTRASONIC AND ACOUSTIC EMISSION TECHNIQUES

摘要

The objective of this work is to study the influence of the moulding conditions of manufacture on the mechanical behaviour of the composites, when which they are submitted to mechanical loading. In order to evaluate the quality of interfacial adhesion, two non-destructive testing procedures were combined. Laser ultrasonic was employed to evaluate the state of the composite microstructure depending on the moulding conditions. Measurements of ultrasonic velocity and attenuation were applied to characterize microstructure and to assess the mechanical properties of the composite. Acoustic Emission techniques coupled with mechanical testing in mode II were then used to study the progressive nature of interface damage due to mechanical loading in mode II.