The Significance of Material Ductility to the Reliability and Load Carrying Capacity of Peak Performance Structures.
Abstract
The fracture ductilities were determined as a function of stress state for Al 2024-T4, Al 7075-T6, 4340 (51 Rc) steel, Ti-6Al-6V-2Sn, annealed and Ti-16V-2.5 Al, solution treated. An attempt was made to correlate the fracture ductility values of these materials to their notch sensitivity and fracture toughness. For the stress states investigated (sigma sub 3 = 0) minimum fracture ductility values were observed for balanced biaxial tension, sigma sub 1 = sigma sub 2, for all materials studied, rather than for the plane strain condition, i.e. sigma sub 2/sigma sub 1 = 1/2 as predicted by a critical normal fracture stress criterion. Notch tensile test series were completed for Al 7075-T6 and Ti-6Al-6V-2Sn, annealed. The limiting local fracture strains, near the notch root, were found to be very close to the minimum fracture ductility values (sigma sub 1:sigma sub 2 = 1:1) found for these materials. Test programs to determine the notch sensitivity and fracture toughness for ultra strength materials, as well as their relationships to material ductility are continuing. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1970
- Accession Number
- AD0715320
Entities
People
- Jin-long Sheu
- John G. Sessler
- Ravinder K. Ahuja
- Volker Weiss
Organizations
- Syracuse University