LOFTING AND FABRICATION OF COMPOUND-CURVED PLATES

Award Information
Agency: National Science Foundation
Branch: N/A
Contract: N/A
Agency Tracking Number: 14258
Amount: $43,198.00
Phase: Phase I
Program: SBIR
Awards Year: 1991
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
P.o. Box 684, Main Street, Southwest Harbor, ME, 04679
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 John S. Letcher, Jr
 President
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE OBJECTIVE OF THE PROPOSED RESEARCH IS TO EXPAND AND IMPROVE THE MATHEMATICAL DESCRIPTION AND QUANTITATIVE UNDERSTANDING OF INCREMENTAL COMPOUNDING AND BENDING PROCESSES USED IN THE MANUFACTURE OF COMPOUND-CURVED METAL PLATES FROM FLAT SHEET STOCK. THE METHOD PROPOSED IS BASED ON DIFFERENTIAL GEOMETRY AND FINITE-ELEMENT METHODS. IT WOULD PROVIDE LOFTING OF ACCURATE BOUNDARY CURVES TO BE CUT FROM THE FLAT MATERIAL, AS WELL AS QUANTITATIVE COMPOUNDING INSTRUCTIONS AND POTENTIAL FEEDBACK CONTROL, SUCH THAT PLATES CAN BE FORMED WHICH ARE APPLICABLE AND/OR FULLY CONFORMED TO SPECIFIC PREPLANNED PORTIONS OF A DESIGNED SURFACE, WITH MINIMAL OR ZERO FIELD TRIM. THREE SPECIFIC AREAS ARE ADDRESSED IN PHASE I RESEARCH: (1) DISCOVERY OF MORE EFFICIENT AND ACCURATE NUMERICAL METHODS FOR SOLUTION OF THE NONLINEAR FINITE-ELEMENT EQUATIONS; (2) FORMULATION AND SOLUTION OF A FINITE-ELEMENT CHARACTERIZATION OF BENDING, THE EXTRINSIC GEOMETRY OF THE PLATE; AND (3) FINITE-ELEMENT ANALYSIS OF RESIDUAL MEMBRANE STRESSES INTRODUCED DURING COMPOUNDING, AND QUANTIFICATION OF THEIR EFFECTS ON THE COMPOUNDING PROCESS.

* Information listed above is at the time of submission. *

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government