Biaxial Fatigue Strength of 24S-T Aluminum Alloy
Abstract
The object of this investigation was to determine the fatigue strength values for 24S-T aluminum alloy when subjected to various ratios of biaxial stresses. The biaxial stresses considered were both tensile. The influence of various ratios of the maximum values of the principal stresses upon the fatigue strength was determined. Fluctuating biaxial tensile stresses were produced by applying a pulsating internal pressure end an axial tensile load to a thin-walled tubular specimen. The maximum and minimum values of the principal stresses were kept in phase. To apply the dynamic loads, a new type of testing machine was designed and constructed. S-N diagrams for four principal stress ratios were obtained for defining the fatigue strength up to 5 by 10(to the 6th power) cycles. An attempt was made to compare the test results with a modified maximum-stress theory of failure but poor agreement was found between theory and test results. The test results show that the uniaxial fatigue strength in the transverse direction of the tubular specimens may be about 60% of the fatigue strength in the longitudinal direction.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1949
- Accession Number
- ADA557592
Entities
People
- Joseph Marin
- William Shelson
Organizations
- Pennsylvania State University