Accession Number : AD0456850


Title :   AN INVESTIGATION INTO THE EFFECT OF ENVIRONMENTAL TREATMENTS ON THE STRENGTH OF E-GLASS FIBRES,


Corporate Author : ILLINOIS UNIV AT URBANA DEPT OF THEORETICAL AND APPLIED MECHANICS


Personal Author(s) : Cameron, N M


Report Date : Jan 1965


Pagination or Media Count : 1


Abstract : The effect of various environmental treatments on the strength of virgin E-glass fibres was studied. Experiments were also conducted to determine the procedures necessary to produce glass fibre specimens with low air strength dispersion. It was found that heating the glass melt at a temperature significantly higher than the forming temperature enabled fibres to be made which had a normal air strength of 550 ksi and a coefficient of variation of about 1%. Fibres were tested afcer various times in vacuum. The strength in vacuum was found to increase with time. Specimens were placed in vacuums for various lengths of time after which they were enveloped in dry nitrogen gas at atmospheric pressure and strength tested in the gas. If the nitrogen gas was at room temperature, the strength was not different from the corresponding vacuum strength. If the nitrogen gas temperature was below room temperature, a strength resulted which was a function of both the temperature and the time of prior evacuation. Samples of fibres were tested in dry nitrogen gas at various temperatures below room temperature. The strength increased rapidly as the test temperature was reduced and reached a maximum value, some 50% higher than the air strength, at liquid nitrogen temperature. Fibre samples were allowed to stand for various times in the laboratory air before being tested in air. A decrease in strength with time of standing was noted, which continued for about 45 days. After this time there was no noticeable strength decrease. (Author)


Descriptors :   *GLASS TEXTILES , MECHANICAL PROPERTIES , ENVIRONMENTAL TESTS , HEAT , MOISTURE , DAMAGE , SURFACE PROPERTIES , LOW PRESSURE , CONTROLLED ATMOSPHERES , CRYOGENICS , PRESSURE , TEMPERATURE , AIR , NITROGEN , TIME , STRESSES , GLASS , SYNTHETIC FIBERS , REINFORCING MATERIALS , MATERIAL FORMING , BIBLIOGRAPHIES


Distribution Statement : APPROVED FOR PUBLIC RELEASE