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Model for thermal stress resistance of truly elastic materials containing more than one crackThe model was developed upon the physical properties of surface energy and intrinsic modulus of elasticity of a material containing a number of equal sized microcracks which are independent of one another. The effect of these cracks upon the strain energy per unit volume of material necessary to continue simultaneous crack growth as well as the measured physical properties was established, and the thermal stress resistance is developed in terms of this energy. The model is expressed in its final form in terms of the measured physical properties of fracture strength, effective modulus of elasticity, and coefficient of thermal expansion. The model was applied to existent thermal stress data of ceramic materials for which these physical properties had been measured. On the basis of these data it was concluded that the thermal stress resistance of a material may be improved by increasing the fracture strength.
Document ID
19740020125
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Lineback, L. D.
(North Carolina State Univ. Raleigh, NC, United States)
Date Acquired
August 7, 2013
Publication Date
January 14, 1974
Publication Information
Publication: Develop. of High Temp. Mater. for Solid Propellant Rocket Nozzle Appl.
Subject Category
Materials, Nonmetallic
Accession Number
74N28238
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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