On the First Failure Energy of Glass-Fiber-Reinforced Plastic Panels Impacted at Low Velocity

Low velocity impact tests at various energy levels were carried out on simply supported circular glass-fiber-reinforced plastic laminates made of glass fabric/epoxy prepreg. Four panel thicknesses, keeping the stacking sequence unchanged, and two tup diameters were employed, to verify the influence of these parameters on the elastic behavior and first failure conditions of the material. A four-parameter model considering the membrane effects and...