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|a (TOE)ost7232320
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|a (TOE)7232320
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|a TOE
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|a GDWR
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|a E 1.99:coo-2422-08
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|a E 1.99:coo-2422-08
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|a coo-2422-08
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|a Materials and mechanics of rate effects in brittle fracture. Progress report, October 1975--October 1976. [PMMA]
|h [electronic resource]
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|a Oak Ridge, Tenn. :
|b distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
|c 1976.
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|a Pages: 8 :
|b digital, PDF file.
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|a text
|b txt
|2 rdacontent.
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|a computer
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|2 rdamedia.
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|a online resource
|b cr
|2 rdacarrier.
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|a Published through SciTech Connect.
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|a 01/01/1976.
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|a "coo-2422-08"
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|a Burns, S.J.
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|a Rochester Univ., NY (USA)
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|a The slow, isothermal, propagation of cracks was analyzed by introducing the fracture mechanics concepts into molecular rate theory. Relations between thermodynamic variables and measurable quantities such as crack velocities, specimen temperature and crack extension force were derived. The shape and distribution of the rate controlling obstacles were left unspecified in the theory. The theory was applied to published crack propagation data in PMMA and agreement between theory and data is found. A literature survey of crack velocity data in a wide selection of materials including inorganic glasses, ceramics, polymers and metals shows the correlation that the crack extension force is inversely proportional to the crack activation area. In rapid crack propagation, a new technique, measuring the complimentary boundary condition to the applied boundary condition was used to deduce the stress intensity factor and the crack velocity during crack propagation in DCB specimens. The technique is easier to use and gives better results than the electro-potential methods of measuring crack length during rapid fracture. The shear force in a rapidly wedged DCB specimen is multiplied by the square root of the time after the wedge strikes the specimen, this product is nearly constant during fracture, from its slight time dependence we deduce how K/sub ID/ and the crack velocity vary as a function of time. Time is eliminated and K/sub ID/ is plotted versus crack velocity.
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|b EY-76-S-02-2422.
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|a Fracture Properties.
|2 local.
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|a Polyacrylates.
|2 local.
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|a Solids.
|2 local.
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|a Ceramics.
|2 local.
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|a Correlations.
|2 local.
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|a Cracks.
|2 local.
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|a Glass.
|2 local.
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|a Kinetics.
|2 local.
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|a Metals.
|2 local.
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|a Methyl Methacrylate.
|2 local.
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|a Polymers.
|2 local.
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|a Research Programs.
|2 local.
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|a Carboxylic Acid Esters.
|2 local.
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|a Elements.
|2 local.
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|a Esters.
|2 local.
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|a Mechanical Properties.
|2 local.
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|a Methacrylic Acid Esters.
|2 local.
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|a Organic Compounds.
|2 local.
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|a Organic Polymers.
|2 local.
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|a Polyvinyls.
|2 local.
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|a Materials Science.
|2 edbsc.
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| 700 |
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|a Burns, S.J.
|4 aut.
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| 710 |
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information.
|4 dst.
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| 710 |
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|a University of Rochester.
|4 res.
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| 856 |
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|u http://www.osti.gov/servlets/purl/7232320/
|z Online Access
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|a .b80963341
|b 03-08-23
|c 08-04-15
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|a web
|b 08-04-15
|c f
|d m
|e p
|f eng
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|h 0
|i 1
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|a Information bridge
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|i 12307460-f104-57ab-8c94-32e8e572f2be
|s 4dd82d32-43ac-5fd2-9562-83a30a5cc0f8
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| 952 |
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|p Can circulate
|a University of Colorado Boulder
|b Online
|c Online
|d Online
|e E 1.99:coo-2422-08
|h Superintendent of Documents classification
|i web
|n 1
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