Accession Number : AD0743321

Title :   Effect of Vacuum Environment on Mechanical Behavior.

Descriptive Note : Annual rept.,

Corporate Author : MARTIN MARIETTA CORP DENVER COLO DENVER DIV

Personal Author(s) : Kramer,Irvin R. ; Kumar,A.

Report Date : FEB 1972

Pagination or Media Count : 33

Abstract : The effect of vacuum environment on the rate of crack propagation of aluminum 2014-T6 and 4130 steel was investigated under plane strain conditions. Compact tension specimens were used which were pin loaded. Center notched specimens of titanium (6Al-4V) were used for crack propagation and crack growth measurements under plane stress conditions in methanol-chloride environment. It is shown that that surface layer contributes to increased rate of crack propagation. A reduction in surface layer stress brought about by vacuum environment or by prestress and surface layer removal treatment decreases the rate of crack propagation. (Author)

Descriptors :   (*CRACK PROPAGATION, CONTROLLED ATMOSPHERES), (*STRESS CORROSION, TITANIUM ALLOYS), ALUMINUM ALLOYS, STEEL, VACUUM, FATIGUE(MECHANICS), STRESSES

Subject Categories : Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE