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Threshold Fracture of Networks

Published online by Cambridge University Press:  25 February 2011

K. A. Mazich  and
C. A. Smith
K. A. Mazich
Affiliation:
Ford Motor Co., PO Box 2053 Drop 3198, Dearborn, MI 48121
C. A. Smith
Affiliation:
Ford Motor Co., PO Box 2053 Drop 3198, Dearborn, MI 48121
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Abstract

We discuss the threshold fracture energy, GO, of networks over a wide range of cross-link density. C, for networks with an average number of main chain steps, ςc, that compare favorably with the entanglement spacing, ςc, follow the 1/2 power law, Go - ς1/2. Two views of molecular fracture, one a chain-breaking mechanism and the other a suction process, produce the 1/2 power law. For lightly cross-linked networks (ςc ≫ ςe), Go appears to decrease with increasing ςc. Trapped entanglements limit the extensibility and fracture energy of these networks. Consideration of rupture of trapped entangled chains gives Go -ςc-1/2; this form agrees reasonably well with data at high ςc.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 491
Copyright
Copyright © Materials Research Society 1992

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