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Full Record for Micrograph 597

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- Micrograph no
- 597
- Brief description
- Frozen stress photoelastic fringe pattern during fibre pushout
- Keywords
- Araldite, birefringence
, composite material
, fibre
, load distribution, photoelasticity
, polymer
, polymer composite, pushout, reinforcement
, residual stress
, shear
- Categories
- Composite, Polymer, Polymer composite
- System
- Araldite (TM)
- Composition
- Araldite CT200/HT907 'matrix' with cylindrical CT200/HT901 'fibre'
- Standard codes
- Reaction
- Araldite is a thermoset polymer, formed by the reaction of an epoxy resin with a hardener. In this case, the epoxy resin is CT200 and the hardeners are HT901 and HT907
- Processing
- A 'reinforcement particle' was cast, cured and machined into a cylinder, and the 'matrix' cast and cured around it. A load was applied at 135deg C and stresses 'frozen in' by slow cooling through Tg
- Applications
- Mechanical characteristics of the fibre-matrix interface are of central importance for composite materials. The distribution of shear stress along the interface is critical to the load distribution and can be evaluated by this method.
- Sample preparation
- A quarter wave plate has been inserted to remove isoclinic fringes
- Technique
- Cross-polarised light microscopy
- Length bar
- 6 mm
- Further information
- The experiment indicates a more uniform of shear stress than that predicted by the shear lag model, suggesting that interfacial shear de-bonding strength values obtained from de-bonding loads on the basis of that model may be overestimates. (See 'The use of single fibre pushout testing to explore interfacial mechanisms in SiC monofilament-reinforced Ti-I. A photoelastic study of the test', Watson and Clyne, Acta metall. mater. Vol 40, No 1, pp 131-139, 1992 for more details.)
- Contributor
- Prof T W Clyne
- Organisation
- Department of Materials Science and Metallurgy, University of Cambridge
- Date
- 03/10/02
- Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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