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[Sandia Lab News]

Vol. 53, No. 2        January 26, 2001
[Sandia National Laboratories]

Albuquerque, New Mexico 87185-0165    ||   Livermore, California 94550-0969
Tonopah, Nevada; Nevada Test Site; Amarillo, Texas

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Engineering sciences

We have made significant advances in the parallel performance and physical fidelity of our suite of electromagnetics and plasma physics computational tools, collectively named EMPHASIS. EMPHASIS is used to qualify systems to intense electromagnetic and X-ray environments, design high-frequency electronics, and model pulsed power components. We are using it to assess shielding effectiveness of a Lockheed Martin system. One EMPHASIS tool has demonstrated performance of 1 trillion operations per second on Sandia's teraflops computer. Another has novel algorithms to dynamically balance the computational load. (1600, 9200) Mark Kiefer, mlkiefe@sandia.gov

EMPHASIS calculated magnetic fields in a cavity containing cable-connected circuit-board modules in response to an external electromagnetic environment.

Sandia has successfully simulated a section of the RHP (radiation-hardened Pentium) microprocessor using the Sandia developed ChileSPICETM circuit simulator. Production runs using ChileSPICE have reduced simulation time from 3-10 times when compared to commercial simulators. The increased performance and enhanced convergence technologies will lead to improved circuit designs on a much larger scale than can be achieved today. Initial performance evaluations of XyceTM, the next generation massively parallel circuit code, show a dramatic improvement in circuit simulation performance. (1700, 9200, 8400, 2300, 9300) Steven Wix, sdwix@sandia.gov

A microstructure-property material model that can predict the accurate stress and failure response for component designs and/or manufacturing processes received an R&D100 award. Three examples exemplify the model. The size/weight of automotive components was lowered resulting in reduced emissions and conservation of fuel. The multiphase aspect of the material model was used in a commercialized heat treatment simulation tool for process design involving carburizing and quenching phase transforming alloy steels. Third, the model was used to optimize die design in a weapons component forging process. (8700) Mark Horstemeyer, mfhorst@sandia.gov

Predictive modeling of the dynamics of structures with bolted interfaces is of broad engineering interest. The damping generated in bolted joints is particularly difficult to model. A combined experimental and analytical program was initiated at Sandia focused on the damping mechanisms in bolted interfaces and led to the discovery of an underlying power law relationship between the applied force and the energy dissipation per cycle. Promising reduced-order analytical models developed will be important to successful modeling of weapon system structural performance. (9100) Dan Gregory, dlgrego@sandia.gov

The GOMA software team has used its broad customer base in defense programs and industry to guide successful research, code development and analysis projects. In an effort to bring a science-based understanding to manufacturing processes, the GOMA team has worked with manufacturing personnel and material scientist in the areas of welding, brazing, cermet processing and encapsulation. Driving projects from model development, to code implementation and finally performing high fidelity engineering analysis has required a team effort with a respect for the talent each member brings to the team. (9100, 9200, 1800, 8700) Justine Johannes, jejohan@sandia.gov

The SALINAS massively parallel 3D structural dynamics code was used to complete critical simulations of W76 system response to hostile radiation environments, running for 24 hours on 2000 ASCI Red processors. Sensitivity and optimization analyses were performed on the arming, fuzing, and firing (AF&F) model using Sandia's DAKOTA software package. A high-fidelity model for timing and scaling studies was generated with CUBIT advanced meshing software. The Sandia team greatly exceeded the milepost success criteria, demonstrating capability beyond anything commercially available. (9100, 9200, 9300) James Peery, jspeery@sandia.gov

Last modified: January 31, 2001

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