Accession Number : AD0629105

Title :   CRACK RESISTANCE PROPERTIES OF HIGH STRENGTH ALUMINUM ALLOYS.

Descriptive Note : Technical research rept.,

Corporate Author : PITMAN-DUNN RESEARCH LABS FRANKFORD ARSENAL PHILADELPHIA PA

Personal Author(s) : Carman,Carl M.

Report Date : DEC 1965

Pagination or Media Count : 62

Abstract : The fracture toughness of both commercial and high purity aluminum alloys of the 7000 and 2000 series was determined by means of the center notched sheet specimen. The instability conditions described here give reproducible and well defined values of fracture toughness. For the very high strength aluminum alloys, the four inch wide specimen is sufficiently large to give accurate values of fracture toughness. Both the compliance and photographic method give the same value of fracture toughness, provided the proper experimental conditions are met. The testing conditions for the 2000 series of aluminum alloys do not conform to the normal requirements for simple fracture mechanics analysis, but the data may be analyzed within the framework of a refined instability model. The fracture toughness of the 2000 series of aluminum alloys is greater than the fracture toughness of the 7000 series. Reduction of iron and silicon contents results in an upgrading of the fracture toughness for both 7075-T6 and 2024-T4 aluminum alloys. Quantitative fractography gives some insight into the mechanisms which may be responsible for the upgrading of the fracture toughness. (Author)

Descriptors :   (*ALUMINUM ALLOYS, FRACTURE(MECHANICS)), (*FRACTURE(MECHANICS), ALUMINUM ALLOYS), ZINC, MAGNESIUM ALLOYS, COPPER ALLOYS, FRACTOGRAPHY, TOUGHNESS, STRAIN HARDENING

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE