دانلود رایگان مقاله انگلیسی مقاومت در برابر نفوذ با سرعت بالا CFRP و CFRP / آلومینیوم ورقه ورقه - الزویر 2018

Abstract:

Carbon fibre-reinforced composite materials are of high potential as protective casing in the aerospace area, acting as an effective solution to lighten components against the collision. The high velocity penetration resistance abilities of unidirectional CFRP laminates and two carbon fibre reinforced aluminium laminates CRALL2/1 and CRALL3/2 (fabricated from CFRP layers combined with aluminium alloy 2024-T3 layers) were evaluated by the ballistic tests with a flat, hemispherical or conical nosed projectile. Revealed from ballistic tests that fracture modes, ballistic limits and specific energy absorptions of CRALLs and CFRP were sensitive to nose shapes. Higher ballistic limits and specific energy absorption ability were performed by CRALLs than monolithic CFRP impacted by all shapes due to the strain rate hardening effect and failure conversion effect. In particular situation of flat nose projectiles penetrating, the specific energy absorption of the CRALL3/2 was 8% higher than that of monolithic aluminium alloy 2024-T3 at same thickness. The CRALLs may then be designed as effective lightweight structures to protect frames against collision in the aerospace area and outperform the traditional single CFRP laminates.

5. Conclusions

The high velocity penetration resistance ability of the CFRP and CRALLs targets 23 have been investigated by the projectiles with a flat, hemispherical or sharp nose. Also compared with the monolithic aluminium 2024-T3 targets at same thickness. These conclusions can be draw below from the comparison: Under high velocity impacting, the fracture modes of the orthogonally laminated CFRP and CRALLs targets are sensitive to projectile nose shapes. With the increasing fibre layers, the influence of the projectile nose shapes on fracture modes of the backside layers in the CRALLs will be diminished by the failure conversion effect. The CRALLs targets performed better penetration resistance to the three shapes nose projectiles than CFRP both in aspects of the ballistic limits and energy absorption performance due to the strain rate hardening effect. The CFRP and CRALLs targets performed better penetration resistance to flat nose projectile than to hemispherical sharp nose projectiles. The specific energy absorption of CRALL3/2 to flat nose projectile was 8% higher than that of monolithic aluminium alloy 2024-T3 at similar thickness.