Accession Number : AD0431510


Title :   THE DEVELOPMENT OF ELECTROFORMING TECHNIQUES FOR WIND TUNNEL MODELS.


Descriptive Note : Final rept.


Corporate Author : MCDONNELL AIRCRAFT CORP ST LOUIS MO


Personal Author(s) : Wiggins,E W


Report Date : 10 Mar 1964


Pagination or Media Count : 27


Abstract : Techniques of electroforming aerodynamically smooth, light-weight, thin-skinned, improved dynamic and thermodynamic response wind tunnel models were investigated. Two methods of con trolling skin thickness and dimensional tolerance of the finished models were investigated. The first method entailed final contour machining, while the second utilized current distribution aids to control the tolerances. The latter method showed promise of reducing machining costs by controlling the electro-deposited metal distribution; however, a complete model was never made due to the low priority and cancellation of this test request. Mechanical properties tests and metallographic studies of the electroformed metal were made. The results showed that the electroformed nickel deposit had an average room temperature ultimate tensile strength of 132,750 psi and an average elongation of 5%. The metallographic studies showed that the physical properties could be improved by elimination of solids contamination from the electroforming bath. The solids contamination was shown to be responsible for crystalline discontinuities within the metal structure, producing cleavage planes and reducing the effective cross-section of the tensile specimens. (Author)


Descriptors :   *MANUFACTURING , WIND TUNNEL MODELS , ELECTROFORMING , WIND TUNNEL MODELS , MECHANICAL PROPERTIES , MACHINING , WEIGHT , THERMODYNAMICS , ELECTRODEPOSITION , PHYSICAL PROPERTIES , NICKEL , TENSILE PROPERTIES , CONFIGURATIONS , FAILURE


Distribution Statement : APPROVED FOR PUBLIC RELEASE