Viscoelastic effect in a phosphate glass-metal seal

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1989.tb06246.x· OSTI ID:6112894

Chambers, R S ^[1]; Monroe, S L; Gerstle, Jr, F P ^[2]

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1. Sandia National Labs., Albuquerque, NM (United States). Applied Mechanics Div. III
2. Sandia National Labs., Albuquerque, NM (United States). Ceramics Development Div.

This paper reports on a family of phosphate glasses developed with thermal expansion behavior in the elastic range that nearly matches the response of 304 stainless steel. Attempts to make concentric pin-shell seals consistently have yielded fractures between 400 {degrees} and 300 {degrees} C during cooling. Elastic stress analyses which neglect glass transitional behavior and utilize constant glassy (elastic) thermal expansion coefficients predict a residual stress state that is compressive. However, viscoelastic computations which include the effects of structural relaxation during glass transition show that tensile stresses sufficient to cause failure arise enduring cooldown of the seal.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6112894
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 72:6; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ELASTICITY
EXPANSION
GLASS
MECHANICAL PROPERTIES
PHOSPHATE GLASS
SEALS
TENSILE PROPERTIES
THERMAL EXPANSION
VISCOSITY