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Influence of temperature during overmolding on the tensile modulus of self-reinforced poly(ethylene terephthalate) insert
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. Volkswagen AG, Grp Res, D-38440 Wolfsburg, Germany..ORCID iD: 0000-0001-9909-7620
Volkswagen AG, Grp Res, D-38440 Wolfsburg, Germany..
Scania CV AB, SE-15187 Sodertalje, Sweden..
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures. KTH, Dept Aeronaut & Vehicle Engn, SE-10044 Stockholm, Sweden..ORCID iD: 0000-0002-6616-2964
2019 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, article id 48334Article in journal (Refereed) Published
Abstract [en]

Self-reinforced polymer composites are thermoplastic materials for design of recyclable lightweight components. The combination of sheet forming and subsequent overmolding from these materials allows an efficient manufacturing process with function integration. This article investigates how temperature exposure during an overmolding cycle influences the tensile modulus, shrinkage, and warpage for an insert made from self-reinforced poly(ethylene terephthalate) (PET) when it is overmolded with polycarbonate (PC)/PET material. The temperature gradient that is induced by overmolding is simulated, and the results are validated through experiments. The results show that the insert reaches a temperature above the glass-transition temperature for the matrix material in the main part of the insert, which leads to relaxation of residual stresses and thereby a reduction of the tensile modulus up to 18% for the insert after overmolding. Even though overmolding is an efficient process, it requires thorough knowledge of how temperature influences the material when applied to self-reinforced composite materials. The study shows very interesting results, which can lead to new areas of applications for self-reinforced PET. 

Place, publisher, year, edition, pages
WILEY , 2019. article id 48334
Keywords [en]
composites, mechanical properties, molding, thermoplastics
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-257553DOI: 10.1002/app.48334ISI: 000478979500001Scopus ID: 2-s2.0-85070676583OAI: oai:DiVA.org:kth-257553DiVA, id: diva2:1354583
Note

QC 20190925

Available from: 2019-09-25 Created: 2019-09-25 Last updated: 2019-09-25Bibliographically approved

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Jerpdal, LarsÅkermo, Malin

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