Accession Number : AD0837470

Title :   ELECTRO-SPARK EXTRUDING.

Descriptive Note : Final rept.,

Corporate Author : FAIRCHILD HILLER CORP FARMINGDALE NY REPUBLIC AVIATION DIV

Personal Author(s) : Leftheris, Basil P. ; Inman, Nelson

Report Date : JUN 1968

Pagination or Media Count : 133

Abstract : This project was undertaken with the purpose of developing a method to cold extrude metals. Advances in electrical discharge methods were proposed (electrohydraulic effect) to generate short-time pressures that could make cold extrusion possible. A container was specially designed for transient and hydrostatic loads. The liquid medium used for the transmission of the hydrostatic pressure was also used to transmit the dynamic pressure using a shock pressure wave generated by the electrical discharge. A new theoretical approach was derived for pulse extrusion. The results to the analysis agree with results from hydrostatic extrusions. Extrusion trials with 1100 F aluminum showed that pulse extrusion was in principle possible. A failure due to stress corrosion prevented any further tests. Details of the failure, such as fractographic study and fracture toughness tests, are included in the report. (Author)

Descriptors :   *EXTRUSION), (*ALUMINUM ALLOYS, (*METALS, MECHANICAL WORKING), HYDROSTATIC PRESSURE, ELECTRIC DISCHARGES, MECHANICAL WAVES, FRACTOGRAPHY, STRESS CORROSION, FAILURE(MECHANICS), WIRING DIAGRAMS, MATHEMATICAL ANALYSIS, DUCTILITY, COMPRESSIVE PROPERTIES.

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE