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Proposed Testing to Assess the Accuracy of Glass-To-Metal Seal Stress Analyses

Chambers, Robert S.; Emery, John M.; Tandon, Rajan T.; Antoun, Bonnie R.; Stavig, Mark E.; Newton, Clay S.; Gibson, Cory S.; Bencoe, Denise N.

The material characterization tests conducted on 304L VAR stainless steel and Schott 8061 glass have provided higher fidelity data for calibration of material models used in Glass - T o - Metal (GTM) seal analyses. Specifically, a Thermo - Multi - Linear Elastic Plastic ( thermo - MLEP) material model has be en defined for S S304L and the Simplified Potential Energy Clock nonlinear visc oelastic model has been calibrated for the S8061 glass. To assess the accuracy of finite element stress analyses of GTM seals, a suite of tests are proposed to provide data for comparison to mo del predictions.

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TYPE SAND Report YEAR 2014
OSTIDOI

Characterization & Modeling of Materials in Glass-To-Metal Seals: Part I

Chambers, Robert S.; Emery, John M.; Tandon, Rajan T.; Antoun, Bonnie R.; Stavig, Mark E.; Newton, Clay S.

To support higher fidelity modeling of residual stresses in glass-to-metal (GTM) seals and to demonstrate the accuracy of finite element analysis predictions, characterization and validation data have been collected for Sandia’s commonly used compression seal materials. The temperature dependence of the storage moduli, the shear relaxation modulus master curve and structural relaxation of the Schott 8061 glass were measured and stress-strain curves were generated for SS304L VAR in small strain regimes typical of GTM seal applications spanning temperatures from 20 to 500 C. Material models were calibrated and finite element predictions are being compared to measured data to assess the accuracy of predictions.

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TYPE SAND Report YEAR 2014
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Multilayer co-extrusion technique for developing high energy density organic devices

Mondy, L.A.; Rao, Rekha R.; Bieg, Lothar F.; Schneider, Duane A.; Stavig, Mark E.; Schroeder, John L.; Winter, Michael R.

The purpose of this project is to develop multi-layered co-extrusion (MLCE) capabilities at Sandia National Laboratories to produce multifunctional polymeric structures. Multi-layered structures containing layers of alternating electrical, mechanical, optical, or structural properties can be applied to a variety of potential applications including energy storage, optics, sensors, mechanical, and barrier applications relevant to the internal and external community. To obtain the desired properties, fillers must be added to the polymer materials that are much smaller than the end layer thickness. We developed two filled polymer systems, one for conductive layers and one for dielectric layers and demonstrated the potential for using MLCE to manufacture capacitors. We also developed numerical models to help determine the material and processing parameters that impact processing and layer stability.

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TYPE SAND Report YEAR 2009
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Results 51–75 of 84
Results 51–75 of 84