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On the interply friction of different generations of unidirectional prepreg materials
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.ORCID-id: 0000-0002-6616-2964
2008 (Engelska)Ingår i: Proceedings of 13th European Conference on Composite Materials (ECCM 13), 2008Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

With the aim of reducing cost of prepreg composite components, manufacturing methods are developed and refined. An automatic tape laying machine can shorten the process cycle by stacking prepreg flat and thereafter allow for forming into desired shapes. Forming of stacked prepreg requires knowledge about the uncured properties of prepreg, such as viscosity of the matrix, intra- and interply deformation properties. This study focuses on the interply friction, i.e. the friction at the prepreg-prepreg interface, and how this affects the forming. The conclusions presented here show that the difference between prepreg material systems is significant. Further, it is concluded that the prepreg-prepreg friction is governed by a combination of Coulomb and hydrodynamic friction, where different mechanical phenomena dominate depending on the test conditions.

Ort, förlag, år, upplaga, sidor
2008.
Nyckelord [en]
prepreg, interply, friction
Nationell ämneskategori
Farkostteknik Bearbetnings-, yt- och fogningsteknik
Forskningsämne
SRA - Produktion
Identifikatorer
URN: urn:nbn:se:kth:diva-10679OAI: oai:DiVA.org:kth-10679DiVA, id: diva2:224715
Konferens
ECCM13: 13th European Conference on Composite Materials, 2 - 5 June 2008, Stockholm, Sweden
Projekt
Kostnadseffektiva kompositer (KEKS)
Forskningsfinansiär
XPRES - Initiative for excellence in production research
Anmärkning

QC 20101015

Tillgänglig från: 2013-01-28 Skapad: 2009-06-22 Senast uppdaterad: 2016-08-11Bibliografiskt granskad
Ingår i avhandling
1. Deformability of unidirectional prepreg materials
Öppna denna publikation i ny flik eller fönster >>Deformability of unidirectional prepreg materials
2009 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

 To reduce cost of structural composites the development of more efficient manufacturing methods is of great interest. Sheet forming of thermoset prepreg, also known as hot drape forming, has been a promising manufacturing method for decades. An automatic tape layer (ATL) can be used to perform the lay-up in an efficient way. The flatly stacked unidirectional prepreg forms a sheet to be formed over a given mould. Knowledge about the materials forming behaviour is important to reach the required shape without flaws, such as wrinkles.

An experimental approach is developed to investigate the intra- (within the layer) and interply deformation. The intraply deformation properties are registered by the use of a bias-extension test and a digital image correlation (DIC) equipment. To measure the interlaminar (between the layers) friction in the prepreg/prepreg interface a specialized rig is designed and built.

The two tested materials are Cycom® HTA/977-2 from Cytec and HexPly® T700/M21 from Hexel, which are examples of the second and third generation of carbon fibre/epoxy prepreg. Where M21 includes craze stoppers in form of thermoplastic particles, the 977-2 has the same function but in melted stage. These particles seem to influence both the intraply deformation modes and increase the level of friction between layers.

The results from the bias-extension test was compared with the theory of pin-jointed net (PJN) and it was found that M21 behaves accordingly. The measured rotation for 977-2 is less than the theoretical, this due to slippage. The rate of deformation seems to have an influence not only on the load level, but also in the mode of deformation. Both for the interlaminar and intraply deformation the resistance to motion were much larger for M21 than 977-2.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2009. s. 25
Serie
Trita-AVE, ISSN 1651-7660 ; 2009:32
Nyckelord
prepreg, deformability, carbon composite
Nationell ämneskategori
Farkostteknik
Identifikatorer
urn:nbn:se:kth:diva-10681 (URN)
Presentation
2009-06-12, H1, Teknikringen 33, KTH, Stockholm, 13:15 (Svenska)
Opponent
Handledare
Projekt
KEKS (kostnadseffektiva kompositer)
Tillgänglig från: 2009-06-24 Skapad: 2009-06-23 Senast uppdaterad: 2012-09-19Bibliografiskt granskad

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