Mechanical Properties and Damage Behavior of Thermoplastic Composites with Glass Fiber Distribution-Layering Design

Based on the macro heterogeneity reinforcement structure design,two different forms of continuous glass fiber mat and mesh were used to prepare the glass fiber distribution-layering thermoplastic composites by the continuously running double-steel belt press machine.The influences of glass fiber distribution-layering structures on composite's mechanical properties and damage behavior were discussed.The results reveal that there is difference in improving the tensile and flexural properties with different reinforcement distribution-layering structures.The outer side continuous glass fiber mat in distribution-layering structure reinforcement can not only restrain the development of hairline crack which is perpendicular to stress direction,but also induce layers peeling with extra pull-broken glass fibers,and thus enhances the tensile properties of composites significantly.On the other hand,the outer side glass fiber mesh in distribution-layering structure reinforcement provides oriented fibers bearing more force with tension failure mode,therefore improves the flexural properties significantly.Fiber bundles within the mesh play a role of toughening,and largely increase the impact strength.Compared with glass fiber mat reinforced thermoplastics (GMT),for the composites with appropriate distribution-layering structure the tensile and flexural properties can increase by 59%~76%,and the notched Izod impact strength can increase by 53%.