12/7/2022 0 Comments Notch coefficient shaft![]() Generally mechanical components and structures contain geometrical discontinuities and notches. Fatigue process undergoes several stages and from an engineering point of view it is convenient to divide the fatigue life of a structure into three stages : fatigue crack initiation, stable crack propagation and unstable crack propagation. T has been estimated that 90 % of all service failures of metal parts are caused by fatigue. Keywords : V Notch, R ratio ,Stress life approach, Mechanical Tests ,Fatigue life, Stress Concentration Factor ,FEA 1.I NTRODUCTION Based on experimental results the effect of stress ratio, R, is highlights on fatigue life and by use Numerical Investigation (FEA).The results show that the life of the specimen increased as the load ratio increased and there is acceptable error between experimental and numerical works. The fatigue experiments were carried out at room temperature, on a cantilever rotating-bending machine. Different instruments like Chemical composition analyzer, Tensile universal testing machine ,Hardness tester, Fatigue testing machine, Optical Light Microscope (OLM) and Scanning Electron Microscope (SEM) were employed in this investigation. By using Stress Life approach, the two types cylindrical specimens smooth (reference) and notched have been investigated and the fatigue life analysis are obtained experimentally and by use FEA. Test results are obtained for constant amplitude load in rotating bending with four stress ratios of R = - 0.5 ,0, 0.25 and 0.5 and the specimens tested were with various notch geometries and dimensions. International Journal of Scientific & Engineering Research, Volume 5, Issue 6, June-2014 1145Įffect of Stress Ratio and V Notch Shape onĪbstract : Fatigue life experiments were performed on three steel alloys with different content of carbon weight (Low, Medium and High ). Effect of Stress Ratio and V Notch Shape on Fatigue Life in Steel Beam ![]()
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