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in subjects: "360403 -- Materials-- Polymers & Plastics-- Mechanical Properties-- -1987"  
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Shelf life determination of an epoxy resin by accelerated aging

Description: The objectives of the study reported were to first define the rate and mode of degradation of an epoxy resin at two storage conditions, 4.4/sup 0/C and 25/sup 0/C, by means of a thermally accelerated aging experiment. Then, samples which had been aged the equivalent of at least 10 years at each storage condition would be tested for conformance to the material specifications. The study's results demonstrate that the commercial resin could be acquired and stored for the required 10 to 11 years wi… more
Date: November 1, 1983
Creator: Smith, H.M.
Partner: UNT Libraries Government Documents Department
open access

Low Temperature Measurement of Thermal and Mechanical Properties of Phenolic Laminate, the Pultruded Polyester Fiberglass and A and B Epoxy Putty

Description: Low temperature measurements were made and are reported of thermal and mechanical properties of phenolic laminate, pultruded polyester fiberglass, and A and B epoxy putty. To determine the modulus, compressive and tensile stress and strain, an Instron machine, a Tinus-Olsen testing machine, a Wheatstone bridge and strain gages were used. (FS)
Date: January 1, 1979
Creator: Wang, S. T.; Kim, S. H.; Kim, N. S.; Cheng, R. S.; Hoffman, J. & Gonczy, J.
Partner: UNT Libraries Government Documents Department
open access

Creep and thermal effects in aging solids

Description: The purpose of this paper is to describe three constitutive models that have been developed for rocks, concrete and filled polymers to represent creep, thermal, stress, and aging effects. Also described in the paper are how these constitutive models are being used to numerically predict the behavior of solids in such diverse situations as aging creep of concrete structures and creeping mantle convection. In all cases low strain rate, compressive material behavior is the main interest.
Date: January 1, 1983
Creator: Anderson, C. A.
Partner: UNT Libraries Government Documents Department
open access

Evaluation of ceramic and polymeric materials for use in engineered barrier systems

Description: Ceramic materials evaluated in the screening studies were Al/sub 2/O/sub 3/ (99.8%), mullite, vitreous silica, BaTiO/sub 3/, CaTiO/sub 3/, CaZrO/sub 3/, CaTiSiO/sub 5/, TiO/sub 2/, ZrSiO/sub 4/, basalt, Pyroceram 9617, and Marcor code 9658 machinable glass ceramic. One grade of graphite (Toyotanso IB-11) was also evaluated. Demineralized water, a synthetic Hanford groundwater, and a synthetic NaCl brine solution were used in the screening tests. Demineralized water was used in all five of the l… more
Date: January 1, 1980
Creator: Fullam, H.T. & Skiens, W.E.
Partner: UNT Libraries Government Documents Department
open access

Effect of cure temperature and isocyanate index on the softening point of rigid polyurethane foam

Description: Thermomechanical and mechanical spectrometry analyses were used to determine the influence of the cure temperature and the isocyanate index on the softening temperature of molded, rigid urethane foam. Foams were formulated from both polyether and polyester polyols, molded to a density of 350 kg/m/sup 3/, and cured at various temperatures. Test results indicate that an increase in the cure temperature produces an increase in the softening temperature of the foam until a maximum value is achieved… more
Date: August 1, 1977
Creator: Neet, T. E.; Parker, B. G. & Smith, C. H.
Partner: UNT Libraries Government Documents Department
open access

Fiber felts as low density structural materials

Description: Short fiber felts structures can be made which provide improvements in properties over foams. In applications where resistance to compression set or stress relaxation are important, bonded fiber felts excel due to the flexing of individual fibers within their elastic limit. Felts of stainless steel and polyester fibers were prepared by deposition from liquid slurries. Compressive properties were determined as a function of felt parent material, extent of bonding, felt density, and length-to-dia… more
Date: January 1, 1981
Creator: Milewski, John V. & Newfield, Stephen E.
Partner: UNT Libraries Government Documents Department
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