NUMERICAL STUDY ON THE PROJECTILE IMPACT RESISTANCE OF MULTI-LAYER SANDWICH PANELS WITH CELLULAR CORES

Abstract

THE PROJECTILE IMPACT RESISTANCE OF SANDWICH PANELS WITH CELLULAR CORES WITH DIFFERENT LAYER NUMBERS HAS BEEN NUMERICALLY INVESTI-GATED BY PERPENDICULAR IMPACT OF RIGID BLUNT PROJECTILE IN ABAQUS/EXPLICIT. THESE PANELS WITH CORRUGATION, SQUARE HONEY-COMB AND PYRAMIDAL TRUSS CORES ARE IMPACTED AT VELOCITIES BE-TWEEN 100M/S AND 900M/S WHILE THE RELATIVE DENSITY RANGES FROM 0.005 TO 0.20. THE EFFECTS OF CORE CONFIGURATION, RELATIVE DENSITY AND LAYER NUMBER ON PROJECTILE IMPACT RESISTANCE OF SANDWICH PANELS WITH CELLULAR CORES ARE STUDIED. AT LOW IMPACT VELOCITY, SANDWICH PANELS WITH CELLULAR CORES OUTPERFORM THE CORRESPONDING SOLID ONES BUT NON-MONTONICITY BETWEEN RELATIVE DENSITY AND PRO-JECTILE RESISTANCE OF SANDWICH PANELS IS FOUND AND ANALYZED. THE INITIAL PEAK LOAD VALUE IS REDUCED UP TO 71.8% BY MULTIPLYING LAYER AND MOREOVER INTERACTION TIME BETWEEN PROJECTILE AND CORRUGATION AND PYRAMIDAL TRUSS SANDWICH PANEL CAN BE EXTENDED BY INCREAS-ING LAYER NUMBERS. AT HIGH IMPACT VELOCITY, THOUGH CORRUGATION AND HONEYCOMB SANDWICH PANELS ARE INFERIOR TO THE EQUAL-WEIGHTED SOLID PANELS, PYRAMIDAL TRUSS ONES WITH HIGH RELATIVE DENSITY OUT-PERFORM THE CORRESPONDING SOLID PANELS. MULTIPLYING LAYER IS NOT ALWAYS A DESIRABLE WAY TO IMPROVE HIGH-VELOCITY PROJECTILE RE-SISTANCE.