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Crystal shear limit to carbon fibre strength

✍ Scribed by W.N. Reynolds; J.V. Sharp

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
757 KB
Volume
12
Category
Article
ISSN
0008-6223

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✦ Synopsis

It is shown that the elastic strain energy due to shear stresses in misoriented crystallites is sufficient to fracture the hexagonal planes in such crystallites when the applied tensile stress is in the range of observed ultimate tensile strengths of carbon fibres. Further conditions must be satisfied locally if a crack so for-med is to propagate and result in tensile failure. The implications with respect to intrinsic strength and the role of defects are discussed for a wide range of fibres. The results indicate that type 1 fibres with strains to failure of -1.3% are possible in the absence of major defects.

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