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Cost and weight efficient assembly of aeronautical composite structures
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-6729-8604
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0002-6616-2964
2015 (English)In: ICCM International Conferences on Composite Materials, International Committee on Composite Materials , 2015Conference paper, Published paper (Refereed)
Abstract [en]

Composite materials and integrated structures are weight-efficient, but not necessarily cost-efficient. In order to compare weight benefits with production cost penalties, the influence of each must be studied simultaneously. Production costs are challenging to estimate as they depend on production method choice as well as involved process variables such as annual production volume. In order to enable simultaneous analysis of cost and weight it is therefore necessary to develop tools that assist in production cost estimation. This paper presents the continuation of previous work, where the manufacturing costs of a composite structure is studied using a novel cost estimation tool, here extended to include that of assembly costs. Focus of this paper is assembly of aeronautical structures. The model is finally applied and discussed through estimating the assembly costs of two cases; that of a co-cured structure and that of a mechanically joined structure. The case study shows that the co-cured wing box is more cost-efficient than that of the mechanically joined wing box. Regarding weight, the mechanically joined structure increases the structural weight by about 1 kg, which corresponds to a weight increase of 1 %. Important cost drivers for the mechanically joined wing box are fastening, drilling and shimming costs, each representing about 20 % of the total cost as the annual production volume increases to 1000 produced structures per year. Important cost drivers for the co-cured wing box is the cost of part positioning and autoclave curing, representing about 40 % of the total cost each as the annual production volume increases to 1000 produced structures per year. 

Place, publisher, year, edition, pages
International Committee on Composite Materials , 2015.
Keywords [en]
Assembly, Composite materials, Integration, Production cost, Structure weight
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236906Scopus ID: 2-s2.0-85053109677OAI: oai:DiVA.org:kth-236906DiVA, id: diva2:1269880
Conference
20th International Conference on Composite Materials, ICCM 2015, 19 July 2015 through 24 July 2015
Funder
EU, FP7, Seventh Framework Programme, 314003
Note

QC 20181211

Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2018-12-11Bibliographically approved

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Karlsson Hagnell, MathildaÅkermo, Malin

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