MATERIAL - 2024-T86 ALUMINUM - STRESS TREATED S-N FATIGUE CURVES FOR - DETERMINATION OF
Abstract
Test results indicate that a slight increase in the fatigue life of 0.051-in. Al alloy sheet material stressed in tension-tension fatigue can be gained for stress levels below approximately 37,000 psi by applying a tensile stress of 35,000 psi to the material during the final 0.5 hour of the normal 375 F and 6.5 hour precipitation hardening treatment. The fatigue life at stress levels above approximately 37,000 psiAPPEARS TO BE REDUCED BY USING THIS TREATMENT TO REPLACE THE NORMAL PRECIPITATION HARDENING TREATMENT. Indications are that the endurance limit at 10,000,000 of tension-tension fatigue is increased from approximately 20,000 psi to approximately 23,000 psi by stressing the material in tension to 35,000 psi during the final 0.5 of the 6.5 hr 375 F precipitation hardening treatment. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 23, 1955
- Accession Number
- AD0289604
Entities
People
- J.c. Batteiger
Organizations
- General Dynamics