Abstract
The low velocity impact response of hybrid epoxy composites reinforced with plain weave fabrics, ply orientation at various angles and filled stratified matrix was analyzed in this study. The hybrid epoxy composites were subjected to impact tests at 45J and 90J of energy levels with drop weight impact machine. The damaged areas were investigated by visual inspection of impacted and non-impacted surfaces and by tomographic images. It was found that the replacement of certain carbon inner plies with glass ones and the modification of fiber orientation improved the damage resistance of the hybrid composites with aramid outer layers subjected to impact loading at 45J of energy level.
Highlights
Fiber reinforced thermosetting composites are used increasingly in domains as aeronautics, automotive, naval, military, etc. due to their high stiffness, strength, damage tolerance, lightweight and low cost as compared to the metallic materials
It can be observed that the hybrid composites with aramid outer plies (H1, H2 and H3) presented a better impact response as compared to the hybrid composites with outer plies made of glass fabric (H4) and carbon fabric (H5)
The behavior of hybrid composites reinforced with different types of fabrics, fiber orientation at various angles (0°, ±15°, ±30°, 45° and 90°) and filled stratified epoxy matrix subjected to low velocity impact loadings at 45J and 90J of energy levels was investigated in this research
Summary
Fiber reinforced thermosetting composites are used increasingly in domains as aeronautics, automotive, naval, military, etc. due to their high stiffness, strength, damage tolerance, lightweight and low cost as compared to the metallic materials. Carbon fiber reinforced polymeric composites are often used in aeronautical industry due to their excellent stiffness, mechanical properties and lightweight, which are important for flight performance. The glass fiber reinforced epoxy composites are used in naval [3,4] and automotive industry fields due to excellent mechanical properties and corrosive resistance. The composites structures can be subjected to high velocity impact loadings such as accidents or military applications. The fiber reinforced laminate composite exhibits higher damage strength in the longitudinal and lateral directions than in the transverse one. The impact resistance of the fiber reinforced stratified polymeric composites depends on their energy absorption capacity, through structural failure by plastic deformations. The typical damage mechanisms leading to failure of material structures are matrix cracking, delamination, fiber breakage and pull-out. The plain weave fabric reinforced composites exhibit a higher low velocity impact performance than that of composites reinforced with unidirectional fibers due to their fiber interlacing in two reciprocally perpendicular directions [9] leading to a restriction of delamination propagation within a smaller area [10]
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