Studies on Basic Mechanisms of Structural Fatigue.
Final rept. 15 Jul 71-14 Jul 74,
WATERLOO UNIV (ONTARIO) DEPT OF CIVIL ENGINEERING
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A cumulative fatigue damage procedure has been developed that can be used to predict the fatigue lives of notched components. This procedure is restricted to situations where time-dependent effects and multiaxial stress states do not effect the structure being analysed. It has been shown that smooth uniaxial specimens can be used to simulate both the stress-strain and the fatigue behavior of the material at the critically deformed region. Computer models of uniaxial stress-strain response have been incorporated into cumulative damage procedures to predict the failure of notched plates and beams. Basic research has been carried out in the areas of biaxial and high temperature stress-strain and fatigue behavior. Preliminary biaxial specimen designs are complete and new equipment has been acquired for further testing of smooth biaxial specimens that can be subjected to tension-compression loading and internal-external pressure. An analytical expression has been developed for the fatigue notch factor that accounts for biaxial stresses.
- Metallurgy and Metallography