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Ceramic technology for Advanced Heat Engines Project

Description: Significant accomplishments in fabricating ceramic components for advanced heat engine programs have provided evidence that the operation of ceramic parts in high-temperature engine environments is feasible. However, these programs have also demonstrated that additional research is needed in materials and processing development, design methodology, and database and life prediction before industry will have a sufficient technology base from which to produce reliable cost-effective ceramic engine… more
Date: July 1, 1991
Creator: Johnson, D. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Status of Rankine-cycle technology for space nuclear power applications

Description: A substantial effort on the development of the liquid metal Rankine cycle space nuclear power system was carried out in programs jointly sponsored by the National Aeronautics and Space Administration (NASA) and the Atomic Energy Commission (AEC) during the period of 1960--1972. Component tests were conducted which have established a considerable technology base for the concept. The development effort and technology status of each component are presented. The key technology issues remaining for … more
Date: January 1, 1991
Creator: Holcomb, R.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Seismic base isolation: Elastomer characterization, bearing modeling and system response

Description: This paper discusses several major aspects of seismic base isolation systems that employ laminated elastomer bearings. Elastomer constitutive models currently being used to represent the nonlinear elastic and hysteretic behavior are discussed. Some aspects of mechanical characterization testing of elastomers is presented along with representative tests results. The development of a finite element based mesh generator for laminated elastomer bearings is presented. Recent advances in the simulati… more
Date: January 1, 1991
Creator: Kulak, R. F.; Wang, C. Y. & Hughes, T. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Seismic response analyses of base isolated structures with high damping elastomeric bearings

Description: Seismic response analysis of base-isolated structures with high damping elastomeric bearings is described. Emphasis is placed on the adaptation of a nonlinear constitutive model for the isolation bearing together with the treatment of foundation embedment for the soil-structure-interaction analysis. The constitutive model requires six input parameters derived from bearing experimental data under sinusoidal loading. The characteristic behavior of bearing, such as the variation of shear modulus a… more
Date: January 1, 1991
Creator: Wang, C. Y.; Tang, Y.; Chang, Y. W.; Seidensticker, R. W. (Argonne National Lab., IL (USA)) & Marchertas, A. H. (Northern Illinois Univ., De Kalb, IL (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analysis of the Samus Collimeter Cart

Description: The SAMUS collimator cart is a support for shielding blocks and the vacuum assembly of the Tevatron beam tube as it passes through the D0 End Iron. It slides on linear bearings mounted in the SAMUS toroid as the End Iron moves in and out. There are two collimators designed for the D0 experiment, designated North and South, each identical except for the shimming of the tungsten center blocks, and thereby the relative position of the Tevatron tube. This report contains calculations of the stresse… more
Date: August 16, 1991
Creator: Bolan, P. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A study of mechanical processing damage in brittle materials. Annual progress report, April 1, 1990--March 31, 1991

Description: The authors continued research on the detection and sizing of surface and bulk defects in hot pressed silicon nitride bearing balls. Two methods were used for these studies: (1) continuation of the application of acoustic microscopy, and (2) a novel technique based on measuring the mechanical quality factor of spherical resonances of the bearing ball.
Date: April 1, 1991
Creator: Khuri-Yakub, B. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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