The design of nylon fiber/phenolic ballistic composites by the implementation of the full factorial experimental design

摘要

In the present work, the attempt was made to assess the applicability of the full factorial experimental design in predicting the ballistic strength of nylon fiber/phenolic composite laminates when subjected to a perpendicular impact by a solid projectile. In the study we used a number of ballistic composites (20 cm x 20 cm) with different areal weight (thickness) and fiber/resin ratio. The composites were made with an open mold high pressure, high-temperature compression of prepreg layers made of plain woven ballistic nylon fabric and polyvinyludbutyral modified phenolic resin of the resole type.udThe preparation of the composite experimental samples was conducted in accordance with the 22 full factorial experimental design. The areal weight of the composites was taken to be the first factor and the second was the fiber/resin ratio. The first factor low and high levels were set at 2 kg/m2 and 9 kg/m2, respectively,and for the second factor – at 80/20 and 50/50, respectively. To approximate the response i.e. the ballistic strength of the composites within the study domain (2 – 9) kg/m2 x (80/20 – 50/50) fiber/resin ratio, the first-order linear model with the interaction was used. The influence of each individual factor to the response function was established, as well as the influence of the interaction of the two factors. We found out that the estimated first-degree regressionudequation with the interaction gave a very good approximation of the experimental results of the ballistic strength of composites within the study domain.