EFFECT OF COMPLIANT THERMOPLASTIC INTERLAYERS ON HIGH VELOCITY IMPACT PERFORMANCE OF COMPOSITE LAMINATES

摘要

The use of thermoplastic interlayers is presented to minimize delamination damage caused byhigh velocity impact in laminated composites. The process involves placing a thin hightoughness thermoplastic film between dry fabric preforms, followed by resin infusion with astructural polymer. 2D and 3D S2-glass fabric and interlayer architectures, with similar glasscontent by weight, were evaluated under high velocity impact with a 7.62 mm (.30”) cylindricalprojectile. Ballistic limit velocities were determined for each case and damage caused by theimpact was studied in detail using C-Scans and cross-section analysis. Analysis of impactedsamples after the test showed a significant enhancement in delamination resistance and reductionin damage for interlayers samples. Ballistic limit velocities normalized by laminate areal densityand damage size showed over 90% increase for interlayer samples compared to the baselines.