Development of Scratch- and Spall-Resistant Windshields.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS
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Studies were performed to evaluate possible ways of improving the primary weaknesses in existing Army helicopter windshields, namely, scratching and spalling. Three experimental windshield material configurations offering a potential solution were fabricated for test and evaluation. The spall problem was approached by using polycarbonate as a backup material and was incorporated into each design. The scratch problem was approached by employing either 1 a hard surface coating, 2 an acrylic cladding, or 3 a thin glass cladding to the polycarbonate backup material. Commercially available materials and abrasion-resistant coatings were evaluated utilizing a windshield wiper apparatus, while spall performance was studied by ballistic testing and high-speed photography of each of three test configurations.