| 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. |
- Olsson, Robin, et al.
(författare)
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Testing and modelling of tension after impact of a thin ply textile composite
- 2016
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Ingår i: ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials. - : European Conference on Composite Materials, ECCM. - 9783000533877
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Konferensbidrag (refereegranskat)abstract
- This paper presents an experimental and numerical study of impact response, damage and tension after impact of thin ply HTS45/RTM6 carbon/epoxy laminates, manufactured via resin transfer moulding. A plain weave from carbon fibre spread-tow bands was used in a quasi-isotropic layup. Finite element simulations were performed using layered shell elements accounting for in-plane damage mechanics, with cohesive surfaces between a few layers of shell elements to account for delamination. The damage was found to include a combination of fibre damage and delaminations, in contrast to a previous study on similar cross-ply laminates, where fibre damage dominated. The rate of decrease in tensile strength after impact was similar to prepreg laminates with conventional ply thickness, but the impacted strength was slightly higher due to a higher undamaged strength for thin ply laminates.
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| 3. |
- Álvarez, E., et al.
(författare)
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Developed technologies for damage simulation in ultrathin composite reinforcements and novel material with outstanding impact performance
- 2016
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Ingår i: International SAMPE Technical Conference. - : Soc. for the Advancement of Material and Process Engineering. - 9781934551233
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Konferensbidrag (refereegranskat)abstract
- Damage assessments in the aerospace industry are for composites more demanding than they were before for traditional materials. The simulation of impact damage and damage growth has become increasingly important where testing of manufactured parts could be highly expensive, and reliable models are therefore essential for those materials that shall be used in this industry. Following the vested interest in Spread Tow reinforcements and its ultra-thin plies due to outstanding performance (among them the market leading TeXtreme®), the European Air TN project DAMTEX has aimed to develop analytical and FE models to predict the impact damage and damage propagation in thin woven composites. Extensive testing has been performed to feed and validate the material models through the characterization of fiber failure, delamination and residual strengths after an impact event in a drop tower test. As a result of the better understanding of these novel materials, a new Spread Tow reinforcement with improved damage performance has been developed. The interlaminar toughness, limited damage and excellent CAI results observed in this new material have outperformed those in currently used carbon fiber reinforcements. TeXtreme® will present the results from the DAMTEX project with regard to the acquired knowledge and developed technologies and materials.
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