Influence of fibre surface treatment on the transverse properties of carbon fibre reinforced composites
Conference
·
OSTI ID:143568
The influence of the fiber-matrix interface on the transverse properties of unidirectional composites has been studied using a combination of experimental and numerical micromechanical analyses. In the model, elastic springs are introduced as interface elements to attain an interphase, displaying mechanical characteristics close to those of the matrix and enabling separation of fiber and matrix. Since these elastic springs represent the chemical bonds formed at the interface as a result of chemical surface treatment, the micromechanical model can directly be related to the effects of this treatment. For verification of the numerical analyses the influence of the interface is determined experimentally by transverse testing of carbon fiber reinforced composites, incorporating carbon fibres subjected to different levels of surface treatment. Numerical results show that the interface neither affects the overall composite modulus nor the stress concentrations in the composite. Consequently, the composite transverse strength and failure strain are proportional to the interfacial bond strength, determined by the number of chemical bonds formed at the interface. This proportionality appears to be limited, since a minimum and maximum transverse strength is predicted for composites with respectively not bonded and perfectly bonded fibres. These observations are confirmed by experiments which indicate that there is no effect of the fiber-matrix interfacial bond strength on the transverse composite modulus. Experimental validation showed that the transverse composite strengths can be fitted to the predicted linear relation with the carbon fiber surface oxygen concentration, determining the interfacial bond strength. The predicted ultimate strength values are experimentally verified as well.
- OSTI ID:
- 143568
- Report Number(s):
- CONF-930246--; ISBN 0-87339-251-5
- Country of Publication:
- United States
- Language:
- English
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