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Odenberger, Torbjörn
Publications (3 of 3) Show all publications
Odenberger, T. & Lundström, S. (2006). Inverse modelling of compression moulding of SMC with usage of computational fluid dynamics (ed.). In: (Ed.), V.E. Verijenko (Ed.), Fifteenth International Conference on Composite Materials (ICCM-15): [... held on 27 June - 1 July 2005 in Durban, South Africa]. Paper presented at International Conference on Composite Materials : 27/06/2005 - 01/07/2005. Durban: Centre for Composite and Smart Materials and Structures, University of KwaZulu-Natal
Open this publication in new window or tab >>Inverse modelling of compression moulding of SMC with usage of computational fluid dynamics
2006 (English)In: Fifteenth International Conference on Composite Materials (ICCM-15): [... held on 27 June - 1 July 2005 in Durban, South Africa] / [ed] V.E. Verijenko, Durban: Centre for Composite and Smart Materials and Structures, University of KwaZulu-Natal , 2006Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Durban: Centre for Composite and Smart Materials and Structures, University of KwaZulu-Natal, 2006
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-32112 (URN)67d78d00-ca7b-11dc-b803-000ea68e967b (Local ID)1868405877 (ISBN)67d78d00-ca7b-11dc-b803-000ea68e967b (Archive number)67d78d00-ca7b-11dc-b803-000ea68e967b (OAI)
Conference
International Conference on Composite Materials : 27/06/2005 - 01/07/2005
Note
Godkänd; 2006; 20080124 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Odenberger, T. (2005). Compression Moulding of SMC, Visualisation and Inverse Modelling (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Compression Moulding of SMC, Visualisation and Inverse Modelling
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Before presenting the Sheet Moulding Compound (SMC) process, which is the primarily focus of this work, a literature survey is carried out to deal with fibre reinforced polymer composites in general. Then the first part of this work is presented and is primarily focused on experimental visualisation of the flow during mould closure of SMC. Circular plates are manufactured with industry scale equipment at close to production conditions. Special attention is given to the advancing flow front, for which the full complexity is captured by means of continuous high resolution close-up monitoring. From the experimental visualisation of the flow front, three phases are defined, namely squish, flow, and boiling. During the initial phase, squish, outer layers do not remain outer layers, the actual flow is very complex and air is likely to be entrapped. The governing process parameters during this phase are mould temperature, mould closing speed and amount of preheating in the mould. During the second phase, flow, the flow is stable and seemingly viscous. During the last phase, boiling, bubbles are observed in the low pressure region at the flow front, favouring the void content both internally and on the surface. Based on a chemical analysis including mass spectrometry and thermogravimetry, the gas is probably styrene. In the second part it is investigated if an inverse modelling approach by proportional regularisation can be applied to mimic the pressure distribution during compression moulding of SMC. The process is simulated with Computational Fluid Dynamics and the mastered parameter, the viscosity of the SMC, is allowed to vary as a function of time. A grid refinement study of two ways to model the process and for three fictitious pressure scenarios yields that the suggested approach work very well and that the numerical errors can be minimised as desired. Finally a validation process is carried out showing that to get quantitative agreements of the whole pressure field more advanced viscosity models must be used. In order to verify the inverse modelling system have to important errors are studied. Firstly the error between calculated and experimental pressure, secondly the discretisation error due to solving the problem for many small volumes. Both have to be minimized and the later is studied with Richardson's extrapolation. The conclusions are that the initial guess is very important for predictions in the beginning of the simulation.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005. p. 41
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 2005:34
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-16860 (URN)04fca050-9ef6-11db-8975-000ea68e967b (Local ID)04fca050-9ef6-11db-8975-000ea68e967b (Archive number)04fca050-9ef6-11db-8975-000ea68e967b (OAI)
Note
Godkänd; 2005; 20070108 (haneit)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Odenberger, T., Andersson, M. & Lundström, S. (2004). Experimental flow-front visualisation in compression moulding of SMC (ed.). Paper presented at . Composites. Part A, Applied science and manufacturing, 35(10), 1125-1134
Open this publication in new window or tab >>Experimental flow-front visualisation in compression moulding of SMC
2004 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 35, no 10, p. 1125-1134Article in journal (Refereed) Published
Abstract [en]

This work is primarily focused on experimental visualisation of the flow during mould closure in compression moulding of sheet moulding compound. Circular plates are manufactured with industry scale equipment at close to production conditions. Special attention is given to the advancing flow front, for which the full complexity is captured by means of continuous high resolution close-up monitoring. From the experimental visualisation of the flow front, three phases are defined, namely squish, flow, and boiling. During the initial phase, squish, outer layers do not remain outer layers, the actual flow is very complex and air is likely to be entrapped. The governing process parameters during this phase are mould temperature, mould closing speed and amount of preheating in the mould. During the second phase, flow, the flow is stable and seemingly viscous. During the last phase, boiling, bubbles are observed in the low pressure region at the flow front, favouring the void content both internally and on the surface. Based on a chemical analysis including mass spectrometry and thermogravimetry, the gas is probably styrene.

National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-2669 (URN)10.1016/j.compositesa.2004.03.019 (DOI)000223822600002 ()2-s2.0-2942696144 (Scopus ID)05291140-9f27-11db-8975-000ea68e967b (Local ID)05291140-9f27-11db-8975-000ea68e967b (Archive number)05291140-9f27-11db-8975-000ea68e967b (OAI)
Note
Validerad; 2004; 20070108 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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