COLD FORMING RESIDUAL STRESSES AND THEIR EFFECT ON THE ACCURACY OF POST-FORMING OPERATIONS

The different sources of residual stresses are mentioned with particular reference to their adverse effect in promoting local ship failures. A simple method for calculating the magnitude and distribution of cold forming residual stresses, for any section, is given. The effect of the shape of stress-strain diagram and the section characteristics are investigated and discussed. Further, the effect of the different post-forming operations, with particular reference to punching, on the shape of the formed member is examined theoretically and experimentally. It is concluded that cold forming residual stresses may reach values as high as the yield stress of the material. Further, the magnitudes and distribution of these stresses depend mainly on the assumed shape of the stress-strain diagram, section characteristics and the degree of bend. It is also concluded that the distribution of these residual stresses should be taken into consideration, during the forming stage, in order to improve the accuracy of the post-forming operations.

• Corporate Authors:

  Scandinavian Ship Technical Society

  Radhusgt 8, Box 162
  Oslo,   Norway 
• Authors:
  • Shama, M A
• Publication Date: 1970

Media Info

• Pagination: p. 23-26
• Serial:
  • European Shipbuilding
  • Issue Number: n2
  • Publisher: Scandinavian Ship Technical Society

Subject/Index Terms

• TRT Terms: Cold working; Forging; Residual stress; Shipbuilding
• Old TRIS Terms: Residual stresses
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00015162
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: May 13 1971 12:00AM