PREDICTION OF PIEZOELECTRIC CONSTANTS OF GLASS FIBER POLYMER COMPOSITES FOR PIEZOELECTIC DAMAGE MONITORING

摘要

Composite materials became widely used in a various industries (for example aerospace, car, andrnyacht) due to high specific strength, specific modulus and damping characteristic. Compositernmaterials need to ensure structural reliability. So non-destructive damage monitoring forrncomposite materials is very important to enhance their structural reliability and then manyrntechniques such as ultrasonic, electric, tapping, optical fiber and acoustic-emission methods havernbeen studied. But there has some disadvantages, such as limited application to conductivernmaterials and using special sensors. This study is basic research of develop for non-destructiverndamage monitoring system such as glass fiber reinforced polymer composite. The main purposernis development for the prediction equation of piezoelectric property to develop self-sensor typernnon-destructive damage monitoring system using piezoelectric characteristic. Design variablesrnsuch as fiber and matrix types, fiber volume fraction and fiber orientation were considered andrnpiezoelectric constants were measured. Finally, the prediction equations were developed basedrnon experimental data and well-known mechanics of composite materials.