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DC Field | Value | Language |
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dc.contributor.author | Rees, DWA | - |
dc.contributor.author | Garner, AF | - |
dc.contributor.author | Dix, S | - |
dc.coverage.spatial | 26 | en |
dc.date.accessioned | 2008-06-04T09:04:03Z | - |
dc.date.available | 2008-06-04T09:04:03Z | - |
dc.date.issued | 2007 | - |
dc.identifier.citation | Engineering Integrity. 23, 6-13 | en |
dc.identifier.uri | http://bura.brunel.ac.uk/handle/2438/2345 | - |
dc.description.abstract | Tensile creeps have been conducted upon a woven, glass-fibre laminated epoxy composite and a 0/90° cross ply, carbon fibre reinforced epoxy composite. For the laminate loading was aligned with a fibre direction. For the ply the loading was inclined to the fibres (off-axis). Testing to stress levels up to 200 MPa and temperatures in the range 20°- 200°C has revealed a form of creep in each material. The creep observed is essentially primary in nature but with extended time •1000 h, it may exhaust or resemble a pseudo-secondary regime with a low rate. Where the load carrying capacity is lost, through fibre breakage or tab slip, the creep rate accelerates suddenly to infinity in a few hours. Smooth creep curves apply to successful tests but many irregular curves resulted from grip failure. A phenomenological approach was used to model smooth curves using a summation of instantaneous, primary and secondary strain terms. For the mat reinforcement a consistent trend was not found between the secondary creep rate and a stress that was raised incrementally upon the same testpiece. However the cumulative instantaneous strain provided the correct elastic modulus. Creep in the solid laminate was believed to be due to a fibre straightening that yielded a limiting strain in a time beyond which the process exhausts. Creep in cfrc was only evident when the fibres were inclined to the stress axis, indicating a viscous flow in the matrix. Moreover, it is believed that a viscous shear sliding between laminates or plies is more likely to contribute to an off-axis deformation mode which is not strain limited. | en |
dc.description.uri | http://www.brunel.ac.uk/about/acad/sed/sedstaff/design/DavidRees | - |
dc.format.extent | 689373 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | Engineering Integrity Society | en |
dc.title | Creep in fibre-reinforced polymer mat composites | en |
dc.type | Research Paper | en |
Appears in Collections: | Materials Engineering Brunel Design School Research Papers |
Files in This Item:
File | Description | Size | Format | |
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Creep in fibre-reinforced polymer mat composites.pdf | 673.22 kB | Adobe PDF | View/Open |
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