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THE EFFECT OF REST PERIODS ON THE FATIGUE LIFE OF MEDIUM CARBON STEEL UNDER DIFFERENT FATIGUE LOADING | ||
| Iraqi journal of mechanical and material engineering | ||
| Article 1, Volume 12, Issue 1, 2012, Pages 48-62 | ||
| Author | ||
| Dr. Hussain J.M.Alalkawi | ||
| Abstract | ||
| The fatigue crack growth ( FGG ) behaviour of medium carbon steel alloy under different rest periods is investigated under room temperature and stress ratio R= -1 using replication technique . This work examines the constant and variable amplitude torsional fatigue under different time of rest periods . The short and long fatigue crack growth equations are obtained experimentally . The average grain size diameter is 0.277 mm which separates between short and long crack region. The main remarks can be drawn from this work are : The fatigue life of specimens is increase by rest periods under constant amplitude tests . The factor of increasing is about 1-12 . While this factor becomes 1.75 – 8.7 times the predicted life for variable amplitude tests . Rest periods generate strain ageing which in terms increase the total fatigue life . | ||
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