A new method to normalize the effect of matrix properties on the value of interfacial shear strength obtained from the fragmentation test |
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Authors: | D Tripathi T Turton F Chen F R Jones |
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Affiliation: | (1) Department of Engineering Materials, The University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK |
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Abstract: | A new method, based on tensile yield strength and strain, has been developed to normalize the effect of matrix properties
on the critical fibre length and the interfacial shear strength obtained from the fragmentation test. It is argued that the
conventional data normalization technique which employs elastic properties of the matrix, is fundamentally flawed because
the model employed to calculate interfacial shear strength assumes perfect plasticity. Single embedded fibre fragmentation
in a range of epoxy resins with differing mechanical properties has been used to validate the new method. Stoichiometric quantities
of the current agent were used to keep the same interfacial chemistry. The proposed method provides more consistent interfacial
shear strength data than existing theories. Furthermore, this normalization technique can also be used to predict the interfacial
shear strength of glass fibres embedded in a range of support resins, such as vinyl ester or epoxy resins. For these cases,
a thin layer of the phenolic resin was used on the glass fibre to keep the interface chemistry the same.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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