الفهرس 
CHAPTER ONE : LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
This work includes an experimental study for improving fatigue behaviour of 0.2% carbon steel shafts having circumferential undercuts. Three different undercut shapes, namely V ; U and U, were investigated. Additional circumferential undercuts were made at different spacing from the original one. The effect of undercut geometry and spacing between undercuts were studied under different cyclic stress levels. Fatigue life for different undercut geometries and spacings were determined . A statistical treatment was performed giving probability lines for each case. Stress level/fatigue life / probability of failure diagrams were constructed at four of common-used probabilities of failure. the most A factor was proposed to measure the improvement in fatigue life due to the presence of an additional undercut. This factor named fatigue life factor FLF),is the fatigue life of double undercut specimen to the fatigue life of single undercut one and it was determined spacings under for different undercut geometries 5 different cyclic levels. and It was found that the presence of an addiLional.