Abstract
The influence of impact energy and stacking sequence on the damage resistance and Compression After Impact (CAI) strength of Carbon and Glass Fibre Reinforced Plastic (CFRP and GFRP respectively) hybrid laminates is investigated. CAI tests demonstrate that, in comparison to fully CFRP laminates, hybrid laminates show increases in structural efficiency of up to 51% for laminates subject to a 12J impact and 41% for those subject to an 18J impact. Laminates displaying the highest stresses at failure are those that exploit stacking sequences and GFRP content to prevent delaminations from forming close to the outer surface of the laminate during impact. This favourable damage morphology inhibits both sublaminate-buckling-driven delamination propagation and anti-symmetric laminate buckling failures.
Highlights
In order to meet emission and structural efficiency targets it is inevitable that the generation of commercial aircraft will show a significant and increasing reliance on the favourable strength and stiffness properties of Carbon Fibre Reinforced Plastics (CFRP)
This paper aims to determine whether the addition of Glass Fibre Reinforced Plastic (GFRP) layers to CFRP laminates can have an enhancing effect on Compression After Impact (CAI) strength
Experiments conducted in this paper provide benchmark results for comparison of CAI damage tolerance and damage resistance properties of CFRP and CFRP/GFRP hybrid laminates
Summary
In order to meet emission and structural efficiency targets it is inevitable that the generation of commercial aircraft will show a significant and increasing reliance on the favourable strength and stiffness properties of Carbon Fibre Reinforced Plastics (CFRP). BVID, which may be caused by dropped tools and impact of small runway debris, leaves surface indentations which are too small to be seen on routine aircraft inspections yet can cause considerable internal damage. Under compressive loading such damage can propagate and cause considerable overall strength reduction [1,2,3]. The HiPerDuct program [4,5] has explored the use of hybrid carbon/glass laminates to significantly increase ductility of laminates This was noted to be a consequence of Glass Fibre Reinforced Plastic (GFRP) plies maintaining laminate integrity at high strain levels by bridging broken CFRP fibres. This paper aims to determine whether the addition of GFRP layers to CFRP laminates can have an enhancing effect on Compression After Impact (CAI) strength
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