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Application of digital speckle photography to measure thickness variations in the vacuum infusion process
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-1033-0244
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-6958-5508
Luleå tekniska universitet.
2003 (English)In: Polymer Composites, ISSN 0272-8397, E-ISSN 1548-0569, Vol. 24, no 3, p. 448-455Article in journal (Refereed) Published
Abstract [en]

A new method to measure the movement of the flexible bag used in vacuum infusion is presented. The method is based on an in-house developed stereoscopic digital speckle photography system (DSP). The advantage with this optical method, which is based on cross-correlation, is that the deflection of a large area can be continuously measured with a great accuracy (down to 10 μm. The method is at this stage most suited for research but can in the long run also be adopted in production control and optimization. By use of the method it was confirmed that a ditch is formed at the resin flow front and that there can be a considerable and seemingly perpetual compaction after complete filling. The existence of the ditch demonstrates that the stiffness of the reinforcement can be considerably reduced when it is wetted. Hence, the maximum fiber volume fraction can be larger than predicted from dry measurements of preform elasticity. It is likely that the overall thickness reduction after complete filling emanates from lubrication of the fibers combined with an outflow of the resin. Besides, the cross-linking starts and the polymer shrinks. Hence, the alteration in height will continue until complete cross-linking is reached.

Place, publisher, year, edition, pages
2003. Vol. 24, no 3, p. 448-455
National Category
Applied Mechanics Fluid Mechanics and Acoustics Energy Engineering
Research subject
Experimental Mechanics; Fluid Mechanics; Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-5221DOI: 10.1002/pc.10043ISI: 000183848600015Scopus ID: 2-s2.0-1842477677Local ID: 343474c0-a873-11db-aeba-000ea68e967bOAI: oai:DiVA.org:ltu-5221DiVA, id: diva2:978095
Note
Validerad; 2003; 20061216 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Lundström, StaffanGebart, Rikard

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