FATIGUE DAMAGE DURING TWO-LEVEL BIAXIAL-STRESS TESTS.
Abstract
Two-level cumulative damage fatigue tests were conducted under biaxial stress conditions for a selected ratio of principal stresses. The tests were conducted in a machine imposing alternating torque and axial force on tubular specimens of mild steel. It was observed that when the lower stress levels were followed by the high stress levels the cycle-ratio sums were greater than unity. When the higher level stresses were applied first, the sums were less than one, as has been observed in the case of uniaxial fatigue. The Miner and the Henry criteria for predicting damage under uniaxial stress were applied to these biaxial stress conditions. The Henry criterion was observed to be more accurate. A modified Henry criterion is proposed for biaxial-stress fatigue, and a concept of negative damage is introduced. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1967
- Accession Number
- AD0815020
Entities
People
- Allan A. Blatherwick
- Norman D. Viste
Organizations
- University of Minnesota