期刊
JOURNAL OF COMPOSITE MATERIALS
卷 48, 期 18, 页码 2237-2249出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021998313496593
关键词
Creep; composites; sandwich; polyurethane foam; glass-fibre reinforced polymer face sheets; power law; composed creep model
资金
- Fundacao para a Ciencia e a Tecnologia (FCT) [PTDC/ECM/113041/2009, SFRH/BD/78584/2011]
- ICIST
- Fundação para a Ciência e a Tecnologia [SFRH/BD/78584/2011, PTDC/ECM/113041/2009] Funding Source: FCT
This paper presents experimental and analytical investigations about the creep behaviour of sandwich panels comprising glass-fibre reinforced polymer faces and rigid polyurethane foam core for civil engineering applications. A full-scale sandwich panel was tested in bending for a period of 3600 h, in a simply supported configuration, subjected to a uniformly distributed load corresponding to 20% of the panel's flexural strength. Additionally, specimens of polyurethane foam core were tested in shear for a period of 1200 h, for three different load levels corresponding to 10%, 20% and 30% of the foam's shear strength. Experimental results were fitted using Findley's power law formulation. Creep coefficients, shear modulus reduction factors and time-dependent shear moduli were obtained for the polyurethane foam in shear. A composed creep model is proposed to simulate the sandwich panel's long-term creep deformations by considering the individual viscoelastic contributions from (1) the core material in shear and (2) the glass-fibre reinforced polymer faces in tension/compression. The composed creep model predictions adequately reproduced the full-scale panel's experimental results. In addition, a good agreement was found between the composed creep model predictions and the extrapolation of the power law fitting obtained from the full-scale panel test, for a 50-year period.
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