Creep behavior of short fiber reinforced composites: Effects of fiber orientation and fiber matrix adhesion

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Creep behavior of short fiber reinforced composites: Effects of fiber orientation and fiber matrix adhesion

Popis výsledku v původním jazyce

Two grades of 30 weight% short fiber reinforced polypropylene were processed by conventional injection moulding (skin core fiber orientation) and push pull technology (high and uniform fiber orientation in flow direction) to plates. Samples were taken out to determine fiber orientation, mean fiber length, static mechanical properties as well as creep-compliance curves parallel and perpendicular to the flow direction. The creep compliances parallel and perpendicular to the flow direction were modeled using the elementary volume concept (EVC) which assumes that a single elementary volume consisting of a matrix part and a composite part can be used to reproduce the mechanical performance of a short fiber composite. The EVC predicts that the time dependent creep of a short fiber composite depends only on the creep of the pure polymer matrix, fiber volume content, aspect ratio and stiffness of both matrix and fiber. The creep compliance parallel to the flow direction is significantly smaller than perpendicular to it. The measured creep behavior is well reproduced by calculated creep compliances derived by the EVC for the first 2 decades but for longer times experimental data are overestimated. Obviously the presence of fibers generates boundary conditions which change the creep kinetics of the matrix part. The calculated creep curves perpendicular to the flow direction are systematically smaller than the measured curves. However, this can be overcome by the introduction of an adhesion factor which reduces the reinforcement efficiency of the composite part, thus accounting for different fiber matrix adhesions.

Název v anglickém jazyce

Creep behavior of short fiber reinforced composites: Effects of fiber orientation and fiber matrix adhesion

Popis výsledku anglicky

Two grades of 30 weight% short fiber reinforced polypropylene were processed by conventional injection moulding (skin core fiber orientation) and push pull technology (high and uniform fiber orientation in flow direction) to plates. Samples were taken out to determine fiber orientation, mean fiber length, static mechanical properties as well as creep-compliance curves parallel and perpendicular to the flow direction. The creep compliances parallel and perpendicular to the flow direction were modeled using the elementary volume concept (EVC) which assumes that a single elementary volume consisting of a matrix part and a composite part can be used to reproduce the mechanical performance of a short fiber composite. The EVC predicts that the time dependent creep of a short fiber composite depends only on the creep of the pure polymer matrix, fiber volume content, aspect ratio and stiffness of both matrix and fiber. The creep compliance parallel to the flow direction is significantly smaller than perpendicular to it. The measured creep behavior is well reproduced by calculated creep compliances derived by the EVC for the first 2 decades but for longer times experimental data are overestimated. Obviously the presence of fibers generates boundary conditions which change the creep kinetics of the matrix part. The calculated creep curves perpendicular to the flow direction are systematically smaller than the measured curves. However, this can be overcome by the introduction of an adhesion factor which reduces the reinforcement efficiency of the composite part, thus accounting for different fiber matrix adhesions.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

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Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials

ISBN

978-3-00-053387-7

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

8

Strana od-do

1-8

Název nakladatele

European Conference on Composite Materials (ECCM)

Místo vydání

Mnichov

Místo konání akce

Mnichov

Datum konání akce

26. 6. 2016

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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