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Title: Stress Mapping in Glass-to-Metal Seals using Indentation Crack Lengths.

Abstract

Predicting the residual stress which develops during fabrication of a glass-to-metal compression seal requires material models that can accurately predict the effects of processing on the sealing glass. Validation of the predictions requires measurements on representative test geometries to accurately capture the interaction between the seal materials during a processing cycle required to form the seal, which consists of a temperature excursion through the glass transition temperature of the sealing glass. To this end, a concentric seal test geometry, referred to as a short cylinder seal, consisting of a stainless steel shell enveloping a commercial sealing glass disk has been designed, fabricated, and characterized as a model validation test geometry. To obtain data to test/validate finite element (FE) stress model predictions of this geometry, spatially-resolved residual stress was calculated from the measured lengths of the cracks emanating from radially positioned Vickers indents in the glass disk portion of the seal. The indentation crack length method is described, and the spatially-resolved residual stress determined experimentally are compared to FE stress predictions made using a nonlinear viscoelastic material model adapted to inorganic sealing glasses and an updated rate dependent material model for 304L stainless steel. The measurement method is a first tomore » achieve a degree of success for measuring spatially resolved residual stress in a glass-bearing geometry and a favorable comparison between measurements and simulation was observed.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1377760
Report Number(s):
SAND2017-9013
656452
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Strong, Kevin, Buchheit, Thomas E., Diebold, Thomas Wayne, Newton, Clay S., Bencoe, Denise N., Stavig, Mark E., and Jamison, Ryan Dale. Stress Mapping in Glass-to-Metal Seals using Indentation Crack Lengths.. United States: N. p., 2017. Web. doi:10.2172/1377760.
Strong, Kevin, Buchheit, Thomas E., Diebold, Thomas Wayne, Newton, Clay S., Bencoe, Denise N., Stavig, Mark E., & Jamison, Ryan Dale. Stress Mapping in Glass-to-Metal Seals using Indentation Crack Lengths.. United States. doi:10.2172/1377760.
Strong, Kevin, Buchheit, Thomas E., Diebold, Thomas Wayne, Newton, Clay S., Bencoe, Denise N., Stavig, Mark E., and Jamison, Ryan Dale. Tue . "Stress Mapping in Glass-to-Metal Seals using Indentation Crack Lengths.". United States. doi:10.2172/1377760. https://www.osti.gov/servlets/purl/1377760.
@article{osti_1377760,
title = {Stress Mapping in Glass-to-Metal Seals using Indentation Crack Lengths.},
author = {Strong, Kevin and Buchheit, Thomas E. and Diebold, Thomas Wayne and Newton, Clay S. and Bencoe, Denise N. and Stavig, Mark E. and Jamison, Ryan Dale},
abstractNote = {Predicting the residual stress which develops during fabrication of a glass-to-metal compression seal requires material models that can accurately predict the effects of processing on the sealing glass. Validation of the predictions requires measurements on representative test geometries to accurately capture the interaction between the seal materials during a processing cycle required to form the seal, which consists of a temperature excursion through the glass transition temperature of the sealing glass. To this end, a concentric seal test geometry, referred to as a short cylinder seal, consisting of a stainless steel shell enveloping a commercial sealing glass disk has been designed, fabricated, and characterized as a model validation test geometry. To obtain data to test/validate finite element (FE) stress model predictions of this geometry, spatially-resolved residual stress was calculated from the measured lengths of the cracks emanating from radially positioned Vickers indents in the glass disk portion of the seal. The indentation crack length method is described, and the spatially-resolved residual stress determined experimentally are compared to FE stress predictions made using a nonlinear viscoelastic material model adapted to inorganic sealing glasses and an updated rate dependent material model for 304L stainless steel. The measurement method is a first to achieve a degree of success for measuring spatially resolved residual stress in a glass-bearing geometry and a favorable comparison between measurements and simulation was observed.},
doi = {10.2172/1377760},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 01 00:00:00 EDT 2017},
month = {Tue Aug 01 00:00:00 EDT 2017}
}

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