Mueller, H. K. and Knauss, W. G. (1971) The Fracture Energy and Some Mechanical Properties of a Polyurethane Elastomer. Transactions of the Society of Rheology, 15 (2). pp. 217-233. ISSN 0038-0032 http://resolver.caltech.edu/CaltechAUTHORS:MUEtsr71
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The energy required to form a unit of new surface in the fracture of a polyurethane elastomer is determined. The rate sensitivity of the material has been reduced by swelling it in toluene. This paper primarily describes the experimental work of measuring the lower limit of the fracture energy. With this value and the creep compliance as a basis, the rate dependence of fracture energy for the unswollen material has been determined. It is thus shown that the dependence of the fracture energy on the rate of crack propagation can be explained by energy dissipation around the tip of the crack. Good agreement between the theoretically and experimentally determined relationships for the rate-sensitive fracture energy is demonstrated.
|Additional Information:||© 1971 Copyright The Society of Rheology. Received July 24, 1969. Revised June 18, 1970. This work represents part of a Ph.D. thesis [http://resolver.caltech.edu/CaltechETD:etd-11152005-142505] submitted [H.K.M.] to the California Institute of Technology. The authors gratefully acknowledge the sponsorship of the National Aeronautics and Space Administration under Research Grant No. NGL-05-002-005, GALCIT 120, while carrying out this work; and the assistance of the Air Force under the Air Force Rocket Propulsion Laboratory, Research and Technology Division, Edwards, California, Air Force Systems Command, United States Air Force, F04611-67-C-0057, during the preparation of the manuscript.|
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|Deposited On:||14 Jun 2008|
|Last Modified:||26 Dec 2012 10:05|
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