Accession Number : AD0715320

Title :   The Significance of Material Ductility to the Reliability and Load Carrying Capacity of Peak Performance Structures.

Descriptive Note : Final rept. 1 Jul 69-30 Sep 70,

Corporate Author : SYRACUSE UNIV N Y DEPT OF CHEMICAL ENGINEERING AND METALLURGY

Personal Author(s) : Weiss,Volker ; Ahuja,Ravinder K. ; Sheu,Jin-Long ; Sessler,John G.

Report Date : NOV 1970

Pagination or Media Count : 65

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)

Descriptors :   (*ALUMINUM ALLOYS, FRACTURE(MECHANICS)), (*STEEL, FRACTURE(MECHANICS)), (*TITANIUM ALLOYS, FRACTURE(MECHANICS)), DUCTILITY, NOTCH SENSITIVITY, STRESSES

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE