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Effects of manufacturing constraints on the cost and weight efficiency of integral and differential automotive composite structures
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. Volvo Car Corporation, Sweden.ORCID iD: 0000-0002-1224-3662
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-9744-4550
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-6616-2964
2015 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 134, 572-578 p.Article in journal (Refereed) Published
Abstract [en]

The introduction of carbon fibre composites into the high volume automotive sector challenges the design process, since these components not only need to be light but also producible in a cost-efficient manner. One way forward is to introduce manufacturing constraints into the design process, but such constraints affect the freedom of design and opportunities to tailor material properties. This work examines the trade-offs between cost-effective design for manufacturing and the weight optimization of composite structures. This will be achieved by introducing restrictions to the number of plies allowed in structural optimization in order to simplify pre-operations and reduce overall manufacturing investments. Both integral and differential design solutions are considered. It was observed that differential solutions were always more cost and weight efficient than the integral solution, however too severe manufacturing constraints result in an expensive final part due to the additional weight.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 134, 572-578 p.
Keyword [en]
Manufacturing constraints, Weight optimization, Composites, Automotive, Multi objective optimization, Cost
National Category
Materials Engineering
Research subject
Vehicle and Maritime Engineering
URN: urn:nbn:se:kth:diva-177932DOI: 10.1016/j.compstruct.2015.08.115ISI: 000363831900058ScopusID: 2-s2.0-84941565152OAI: diva2:876350
XPRES - Initiative for excellence in production research

QC 20151203

Available from: 2015-12-03 Created: 2015-11-30 Last updated: 2016-04-18Bibliographically approved
In thesis
1. Framework for cost and weight efficient conceptual design of automotive composite body structures
Open this publication in new window or tab >>Framework for cost and weight efficient conceptual design of automotive composite body structures
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The automotive industry is facing a great challenge - reducing the weight of their vehicles. Carbon fibre composites are regarded by many as the only real option as traditional engineering materials are now running out of potential for further weight reduction. In this doctoral thesis a framework is presented which will provide guidelines for the conceptual phase of the development of an automotive composite body structure. The framework is initiated by defining ideal material diversity, as well as initial partition of the body structure based on process and material selection. Then, a further analysis of the structures is made in order to evaluate whether a more cost efficient solution can be found by further dividing the structure. Such a differential design approach is analysed in the third part of the work, studying both the financial and structural effects of such partitioning. In order to increase the understanding of the intimate relationship between design, material and manufacturing process, balancing manufacturing and structural optimization is addressed. Finally, drape simulation tools are used to assess the geometric complexity of composite structures in order to further quantify suitable split lines in cases of differential design approach.

Different carbon fibre composite material systems and processes are compared and evaluated in the work. The results show that a high-performance material system with continuous fibres is both more cost and performance effective as compared to industrialised, discontinuous fibre composites. Further analysis shows the importance of balancing the design for manufacturing and the structural weight optimization of the structures in order to reach a cost and weight effective design. When restricting composite design freedom with manufacturing constraints, the great benefits of structural composites disappear and with this both weight and cost effectiveness.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 52 p.
TRITA-AVE, ISSN 1651-7660 ; 2016:18
composites automotive cost weight body structure
National Category
Aerospace Engineering
Research subject
Aerospace Engineering; Fibre and Polymer Science; Transport Science
urn:nbn:se:kth:diva-185213 (URN)978-91-7595-944-3 (ISBN)
Public defence
2016-06-03, Sal E3, Osquars backe 14, KTH-Campus, Stockholm, 10:15 (English)

QC 20160418

Available from: 2016-04-18 Created: 2016-04-13 Last updated: 2016-05-16Bibliographically approved

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The full text will be freely available from 2017-09-03 16:07
Available from 2017-09-03 16:07

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Mårtensson, PerZenkert, DanÅkermo, Malin
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