Impact Delamination and Fracture in Aluminum/Acrylic Sandwich ...

Load (N)40003000200010000-1000EnergyLoad1 inch drop2 inch drop3 inch drop0 5 10 15 20Time (ms)Figure 4. Time histories of loading and energy of a castacrylic plate with aluminum shielding on topimpacted at room temperature by a weightdropped from different heights.2520151050Energy (J)180°F 205°FFigure 7. Damage patterns of cast acrylic at varioustemperatures impacted by a weight dropped from5”.Load (N)240019001400900400-100LoadEnergy180 F205 F0 5 10 15 20Time (ms)1086420Energy (J)Figure 8. Time histories of loading and energy of a purecast acrylic specimen impacted at varioustemperatures by a weight dropped from 5”.3001” 3” 5”Figure 5. Damage patterns of cast acrylic with aluminumsupport from bottom impacted by a weightdropped from different heights at roomtemperature.Load (N)500040003000200010000-1000LoadE n e yEnergy1 inch drop3 inch drop5 inch drop0 5 10 15 20Time (ms)50403020100Energy (J)Crack length (mm)2502001501005000 25 50 75 100 125 150 175 200 225 250Temperature (F)Figure 9. Temperature effect on total crack length in a purecast acrylic specimen impacted by a weightdropped from 5”.Figure 6. Time histories of loading and energy of a castacrylic plate with aluminum support from bottomimpacted at room temperature by a weightdropped from different heights.518