Compressive strength of coated rigid-rod polymer fibres
| Autor: | K. E. Newman, U. Santhosh, C. Y. C. Lee |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
chemistry.chemical_classification
Materials science Mechanical Engineering Composite number chemistry.chemical_element Polymer engineering.material Compressive strength Synthetic fiber chemistry Coating Shear (geology) Buckling Mechanics of Materials Aluminium engineering General Materials Science Composite material |
| Zdroj: | Journal of Materials Science. 30:1894-1901 |
| ISSN: | 1573-4803 0022-2461 |
| Popis: | One limitation to the use of high-strength/high-modulus rigid-rod polymer fibres like poly-(p-phenylene benzobisthiazole) (PBZT) and poly-(p-phenylene benzobisoxazole) (PBZO) in composite structures is their low compressive strength. Various theories have been developed to predict compressive strength of rigid-rod fibres. In this study the critical buckling stress for rigid-rod fibres with stiff external coatings has been theoretically modelled assuming that the failure mode in compression is the microbuckling of the fibrils in shear. Our model predicts that significant improvement in fibre compressive strength will occur only when relatively thick coatings, with thickness to diameter (t/D) ratios in excess of > 0.05, are used. Experimentally measured compressive strength of aluminium coated PBZT fibres shows values in good agreement to the theory at t/D ratios of 0.006 and below. Factors related to the selection of suitable coating materials and problems associated with establishing coating performance are identified. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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