Accession Number : AD0464261


Title :   EXPLORATION AND EVALUATION OF NEW GLASSES IN FIBER FORM


Descriptive Note : Final summary rept. 16 Nov 1961-15 Feb 1965


Corporate Author : SOLAR TURBINES INTERNATIONAL SAN DIEGO CA


Personal Author(s) : Schmitz, Gunther K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/464261.pdf


Report Date : 20 May 1965


Pagination or Media Count : 89


Abstract : The strength of E- and S-glass fibers was investigated by tensile tests and static fatigue (constant load) tests. The principal variables were: gage length, strain rate, applied stress in static fatigue, and humidity. The gage length study led to identification of two types of surface flaws and a structural flaw type related to the heterogeneity of the glass network. Severity and distribution of flaws were derived from failure probability plots and strength-length plots at one strain rate in laboratory atmosphere. The effects of strain rate and of humidity on the flaw characteristics was studied. Extensive static fatigue tests provided insight into the stress corrosion processes. Fibers retained the initial tensile strength over 95 percent of the static fatigue exposure. It was postulated that chemical events during this incubation period had to reach a critical stage before stress corrosion could occur, and that corrosion originated on sites of structural flaws located near the surface. These findings are in disagreement with the current theory on stress corrosion and a new model is proposed.


Descriptors :   *CERAMIC FIBERS , *GLASS TEXTILES , TENSILE PROPERTIES , TEST EQUIPMENT , STRAIN(MECHANICS) , GLASS , FATIGUE(MECHANICS) , STATISTICAL ANALYSIS , MOISTURE , FAILURE(MECHANICS) , HUMIDITY , SYNTHETIC FIBERS , CORROSION , STRESSES , MECHANICAL PROPERTIES


Subject Categories : Refractory Fibers


Distribution Statement : APPROVED FOR PUBLIC RELEASE