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Properties of Glasses at Elevated Temperatures.

AD442749

Publication Date	1964
Personal Author	Kerper, M. J.; Scuderi, T. G.; Eimer, E. H.
Page Count	17
Abstract	In order to establish realistic design criteria applicable to selected oxide glasses having utility as viewing windows in Air Force vehicles, certain physical properties have been determined throughout the useful temperature range of these glasses. Temperatures below which no creep was detected for annealed specimens at stresses of 33% of the average modulus of rupture are reported for five of the glasses in the program. The relationship of the area under stress to the strength for annealed plate specimens was investigated. It was found that: (1) fracture originates randomly throughout the area of uniform stress, (2) the strength decreases as the area under maximum stress increases, and (3) specimens that fracture at the edge are generally weaker than those that fracture at the surface. (Author)
Keywords	Glass Transparent panels Physical properties Airplane panels Hightemperature research Fracture (Mechanics) Stresses Creep Surface area Loading Mechanic Rupture Temperature Silicon compounds Dioxides
Source Agency	Non Paid Delimited ADS Delimited-No Subject Categories Batch C
Corporate Authors	National Bureau of Standards, Washington, DC.
Supplemental Notes	Report on Materials Application.
Document Type	Technical Report
Title Note	Annual summary rept. no. 8, 1 Jan-31 Dec 63.
NTIS Issue Number	198126

Properties of Glasses at Elevated Temperatures.

Properties of Glasses at Elevated Temperatures.
AD442749

Publication Date	1964
Personal Author	Kerper, M. J.; Scuderi, T. G.; Eimer, E. H.
Page Count	17
Abstract	In order to establish realistic design criteria applicable to selected oxide glasses having utility as viewing windows in Air Force vehicles, certain physical properties have been determined throughout the useful temperature range of these glasses. Temperatures below which no creep was detected for annealed specimens at stresses of 33% of the average modulus of rupture are reported for five of the glasses in the program. The relationship of the area under stress to the strength for annealed plate specimens was investigated. It was found that: (1) fracture originates randomly throughout the area of uniform stress, (2) the strength decreases as the area under maximum stress increases, and (3) specimens that fracture at the edge are generally weaker than those that fracture at the surface. (Author)
Keywords	Glass Transparent panels Physical properties Airplane panels Hightemperature research Fracture (Mechanics) Stresses Creep Surface area Loading Mechanic Rupture Temperature Silicon compounds Dioxides
Source Agency	Non Paid Delimited ADS Delimited-No Subject Categories Batch C
Corporate Authors	National Bureau of Standards, Washington, DC.
Supplemental Notes	Report on Materials Application.
Document Type	Technical Report
Title Note	Annual summary rept. no. 8, 1 Jan-31 Dec 63.
NTIS Issue Number	198126