Compressive strength of coated rigid-rod polymer fibres

One limitation to the use of high-strength/high-modulus rigid-rod polymer fibers 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 streng...

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Bibliographic Details
Published in:Journal of materials science 1995-04, Vol.30 (7), p.1894-1901
Main Authors: SANTHOSH, U, NEWMAN, K. E, LEE, C. Y.-C
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fibers and threads
Forms of application and semi-finished materials
Polymer industry, paints, wood
Technology of polymers
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Summary:One limitation to the use of high-strength/high-modulus rigid-rod polymer fibers 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 fibers. In this study the critical buckling stress for rigid-rod fibers with stiff external coatings has been theoretically modeled assuming that the failure mode in compression is the microbuckling of the fibrils in shear. Our model predicts that significant improvement in fiber 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 aluminum coated PBZT fibers shows values in good agreement with 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. (Author)
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00351628