ELECTRO-SPARK EXTRUDING.

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)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1968
Accession Number
AD0837470

Entities

People

  • Basil P. Leftheris
  • Nelson Inman

Tags

DTIC Thesaurus Topics

  • Aluminum
  • Containers
  • Corrosion
  • Dynamic Pressure
  • Extrusion
  • Hydrostatic Pressure
  • Metals
  • Static Pressure
  • Stress Corrosion
  • Toughness

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Mechanical Engineering/Mechanics of Materials.
  • Metallurgy