| 1. |
- González, E. V., et al.
(författare)
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Low-velocity impact and compression after impact response of thin ply based composite laminates
- 2015
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Ingår i: ICCM International Conferences on Composite Materials. - : International Committee on Composite Materials.
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Konferensbidrag (refereegranskat)abstract
- The advantage of using thin plies is a well-known feature in laminated composite plates, since the homogenized properties usually improve, and in turn, the performance of the structure. In the literature, several works deal with the study of the ply thickness effect for different structures and loading conditions. However, fewer studies have been performed to understand the structure response under out-of-plane loading, such as the low-velocity impact event. The apparition of high quality manufactured ultra-thin plies, such as the composite material product TeXtreme of Oxeon AB, requires a detailed analysis of their damage resistance and tolerance performance under impact loading. The present work deals with a discussion of a large experimental test campaign of drop-weight impact tests and Compression After Impact (CAI) tests on ultra-thin ply based composite laminates. The composite material analysed is a plain-weave fabric with HTS45 fibers and 20 mm wide yarns, used with HexFlow RTM 6 mono-component epoxy system, and manufactured out-of-autoclave. Two ply thicknesses are considered: 0.08 mm and 0.16 mm. For each case, the same laminate thickness and stacking sequence is considered in order to define the same in-plane stiffness. The study considers different impact energy levels.
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| 2. |
- Wagih, A., et al.
(författare)
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Damage sequence in thin-ply composite laminates under out-of-plane loading
- 2016
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Ingår i: Composites. Part A, Applied science and manufacturing. - : Elsevier Ltd. - 1359-835X .- 1878-5840. ; 87, s. 66-77
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Tidskriftsartikel (refereegranskat)abstract
- The study of the damage sequence in polymer-based composite laminates during an impact event is a difficult issue. The problem can be more complex when the plies are thin. In this paper, quasi-static indentation tests were conducted on thin-ply laminates to understand qualitatively the damage mechanisms and their sequence during low-velocity impact loading. TeXtreme® plain weave plies were used with two different thicknesses, 0.08 mm and 0.16 mm (referenced as ultra-thin-ply and thin-ply, respectively), and tested under different load levels. Load-displacement curves were analyzed and the extent of damage was inspected using optical microscopy and ultrasonic technique. The results showed that the damage onset occurs earlier in thin-ply laminates. The damage onset in thin-ply laminates is matrix cracking which induces delaminations, whereas for ultra-thin-ply laminates is due to delaminations which are induced by shear forces and small amount of matrix cracking. Moreover, the fiber breakage appears earlier in ultra-thin-ply laminates.
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