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Karlsson Hagnell, MathildaORCID iD iconorcid.org/0000-0001-6729-8604
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Publications (3 of 3) Show all publications
Karlsson Hagnell, M. & Åkermo, M. (2015). A composite cost model for the aeronautical industry: Methodology and case study. Composites Part B: Engineering, 79, 254-261
Open this publication in new window or tab >>A composite cost model for the aeronautical industry: Methodology and case study
2015 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 79, p. 254-261Article in journal (Refereed) Published
Abstract [en]

This paper presents a novel composite production cost estimation model. The strength of the model is its modular construction, allowing for easy implementation of different production methods and case studies. The cost model is exemplified by evaluating the costs of a generic aeronautical wing, consisting of skin, stiffeners and rib feet. Several common aeronautical manufacturing methods are studied. For studied structure, hand layup is the most cost-effective method for annual volumes of less than 150 structures per year. For higher production volumes automatic tape layup (All) followed by hot drape forming (HDF) is the most cost-effective choice.

Keywords
Carbon fibre, Analytical modelling, Lay-up (manual/automated), Prepreg
National Category
Materials Engineering Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-173130 (URN)10.1016/j.compositesb.2015.04.043 (DOI)000358808300028 ()2-s2.0-84929324806 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 314003XPRES - Initiative for excellence in production research
Note

QC 20150918

Available from: 2015-09-18 Created: 2015-09-07 Last updated: 2017-12-04Bibliographically approved
Karlsson Hagnell, M. & Åkermo, M. (2015). Cost and weight efficient assembly of aeronautical composite structures. In: ICCM International Conferences on Composite Materials: . Paper presented at 20th International Conference on Composite Materials, ICCM 2015, 19 July 2015 through 24 July 2015. International Committee on Composite Materials
Open this publication in new window or tab >>Cost and weight efficient assembly of aeronautical composite structures
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
Assembly, Composite materials, Integration, Production cost, Structure weight
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-236906 (URN)2-s2.0-85053109677 (Scopus ID)
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
Hagnell, M. K. & Ņkermo, M. (2015). Cost modelling of composite structures. JEC Composites Magazine, 52(96), 28-29
Open this publication in new window or tab >>Cost modelling of composite structures
2015 (English)In: JEC Composites Magazine, ISSN 1639-965X, Vol. 52, no 96, p. 28-29Article in journal (Refereed) Published
Abstract [en]

In aeronautics, composite materials are weight-efficient but difficult and often costly to produce. To study this contrast, the authors are working on a methodology where the costs of composite manufacture and assembly are estimated as a function of structure geometry, complexity and manufacturing approach.

National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-180870 (URN)2-s2.0-84945187796 (Scopus ID)
Note

QC 20160202

Available from: 2016-02-02 Created: 2016-01-25 Last updated: 2016-11-23Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-6729-8604

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