| 1. |
- Frormann, Lars, et al.
(författare)
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Natural Fiber Reinforced Composite Structures for Dynamic Loaded Applications
- 2004
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Ingår i: The Nordic Textile Journal 2004, p. 79-84. - : University College of Borås. The Swedish School of Textiles.
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Natural fiber reinforced composites are well known for static and middle stresssed applications like the hat rack, the car roof or the indoor car interior lining since the beginning of 1990. As these samples show a lot of applications have been done by natural fiber reinforced composites but in the last 2 to 3 years further implementations are missing. Now it is possibel to use natural fibers in a special combination of different semi finished textiles for high dynamic loaded applications like a scooter beam. The lecture will show the used kinds of different textiles and the reachable mechanical properties for this material combination.
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| 2. |
- Karlsson Hagnell, Mathilda
(författare)
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Technical cost modelling and efficient design of lightweight composites in structural applications
- 2019
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- A lightweight transport design reduces fuel costs and emissions and can be achieved through the use of fibre-reinforced composite materials. Although lightweight, the composite raw material can be expensive and the sequential component production challenging and costly. To design weight- and cost-efficient composite structures and find ways to reduce production costs, technical cost modelling must be applied. In this thesis, a technical cost model for composite manufacture, assembly and basic inspection is proposed and implemented to identify cost drivers, evaluate trending design strategies and suggest appropriate composite design guidelines for transport and aeronautical applications. Among identified cost drivers, material costs dominates at 50-90 % of the total part cost also for low annual volumes. Tooling costs are second in importance for slow processes and large parts while the importance of investment and labour depends on degree of automation. Part integration is shown to only marginally reduce cost. Traditional composite assembly is in turn found to potentially reduce costs by 30 % through the elimination of non-value-adding processes such as shimming and part positioning. In comparison to part integration, sandwich design exhibits superior cost- and weight-efficiency for low-to-intermediate stiffness levels. Moreover, the industry impact of a sustainable, circular recycling flow of composite materials is estimated and shown to give up to halved raw material costs as well as cost returns also for virgin carbon fibre users. Low-cost fibres such as glass, lignin-based carbon, hemp and recycled carbon fibres are found to be highly cost-competitive also for structural adaptions.The technical cost model, method and results presented in this thesis provide important composite design conclusions and a foundation for further modelling work needed to reach that elusive weight- and cost-optimal composite design.
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| 3. |
- Vernet, Nicolas, et al.
(författare)
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Experimental determination of the permeability of engineering textiles : Benchmark II
- 2014
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Ingår i: Composites. Part A, Applied science and manufacturing. - : Elsevier Ltd. - 1359-835X .- 1878-5840. ; 61, s. 172-184
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Tidskriftsartikel (refereegranskat)abstract
- In this second international permeability benchmark, the in-plane permeability values of a carbon fabric were studied by twelve research groups worldwide. One participant also investigated the deformation of the tested carbon fabric. The aim of this work was to obtain comparable results in order to make a step toward standardization of permeability measurements. Unidirectional injections were thus conducted to determine the unsaturated in-plane permeability tensor of the fabric. Procedures used by participants were specified in the guidelines defined for this benchmark. Participants were asked to use the same values for parameters such as fiber volume fraction, injection pressure and fluid viscosity to minimize sources of scatter. The comparison of the results from each participant was encouraging. The scatter between data obtained while respecting the guidelines was below 25%. However, a higher dispersion was observed when some parameters differed from the recommendations of this exercise.
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