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Finite difference adaptation of the decomposition of layered composite structures on irregular grid
KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0002-8237-5847
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-0198-6660
2014 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 48, no 20, 2427-2439 p.Article in journal (Refereed) Published
Abstract [en]

The finite difference method is used to solve the time-dependent thermo mechanical response of a layered composite structure subjected to fire. State variables of the composite are chosen whereby the external and internal boundary conditions are derived for an irregular grid through the thickness of the structure. The homogenised mass flux and specific heat capacity of pyrolysis gases over a layered composite is also defined. The formulations are tested against documented results found in the literature.

Place, publisher, year, edition, pages
2014. Vol. 48, no 20, 2427-2439 p.
Keyword [en]
composites, layered structure, fire response, pyrolysis, finite difference method
National Category
Vehicle Engineering Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-122383DOI: 10.1177/0021998313499196ISI: 000340207400001Scopus ID: 2-s2.0-84904814624OAI: oai:DiVA.org:kth-122383DiVA: diva2:622086
Funder
Vinnova
Note

Updated from submitted to published.

QC 20140912

Available from: 2013-05-20 Created: 2013-05-20 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Multi-Functional Composite Design Concepts for Rail Vehicle Car Bodies
Open this publication in new window or tab >>Multi-Functional Composite Design Concepts for Rail Vehicle Car Bodies
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Structures and material combinations, tailored for multiple purposes, are within the reach of vehicle manufacturers. Besides reducing the environmental impact of the transportation sector these multi-functional structures can reduce costs, such as development, manufacturing and maintenance, and at the same time offer improved comfort to the passengers. This thesis sets out to develop multi-functional design algorithms and evaluate concepts for future composite high speed train car bodies with the objective of optimising the amount of mass needed to fulfil all functions of the structure.

In a first step complete composite car bodies were developed, optimised and evaluated based on global stiffness requirements and load cases. The knowledge gained in this step was used as requirements for the strength and stiffness of panels during the continued development of the multi-functional optimisation which, besides strength and stiffness, later also considers sound transmission, thermal insulation, geometric restrictions, manufacturability and fire safety. To be able to include fire safety in the analysis, a method for simulating the high temperature response of layered composite structures was needed, and developed.

Significant weight reductions are proven when utilising carbon fibre in the load carrying structure of the vehicle, on component level as high as 60%. Structures can be made significantly thinner when using the algorithms developed in this thesis and wall thickness is reduced by 5-6 cm. Analysis carried out and extensive literature surveys also suggest significant cost savings in manufacturing, maintenance and use-phase, even thou the raw material cost can be significantly higher as compared to the conventional steel or aluminium alternatives.

Results from drive cycle simulations showed that the benefit, with respect to reduced energy consumption, is in the range of 0.5-0.8% per reduced weight percentage, comparable to both automotive and air applications.

The algorithms and methods established in this thesis can be directly applied for the development and analysis of future high speed train car bodies.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. ix, 59 p.
Keyword
Car body, Composite, Finite element, Lightweight, Multi-discipline, Multi-functional, Optimisation, Rail Vehicles, Sandwich Panels
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-122391 (URN)978-91-7501-751-8 (ISBN)
Public defence
2013-06-10, Kollegiesalen, plan04, Brinellvägen 8, KTH Royal Institute of Technology, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130521

Available from: 2013-05-21 Created: 2013-05-20 Last updated: 2013-05-21Bibliographically approved

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Stichel, SebastianWennhage, Per

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