Abstract
In the current research, pressure bearing capacity of AISI 316L austenitic stainless steel is evaluated under fatigue loading through finite element method (ANSYS 18.1) for a specimen with no notch on its surface. Thereafter, the pressure bearing capacity of the same specimen is evaluated with rectangular and V-notches at the center. The notch geometry is changed in terms of its width, depth and the notch central angle (perimeter length) for each of the rectangular and V-notched cases. Fifteen types of rectangular notch and V-notch geometries are undertaken for the research as required by Box-Behnken model of Response Surface Methodology (RSM) analysis. The primary objective of the research is to evaluate the impact of notch geometry on the pressure bearing capacity under fatigue loading conditions. It is observed that fatigue life degraded more with V-notched specimens when compared to rectangular notched ones. Regression equations are developed and surface plots are generated for both rectangular and V-notch cases for the pressure bearing capacity which is dependent on width, depth and notch central angle.
Highlights
When a material is subjected to repeated cycles of stress or strain, failure occurs by leading to fracture at some weak points and this type of a failure is termed as Fatigue
The results showed that the notch geometry has profound effect on fatigue life of a shaft
Three types of notch geometries, V-shape, U-shape and rectangular-shape notches of various sizes are considered for their investigation and maximum and minimum fatigue life reduction occurred for the V-shape and U-shape notches
Summary
When a material is subjected to repeated cycles of stress or strain, failure occurs by leading to fracture at some weak points and this type of a failure is termed as Fatigue. Thereby fatigue life of component is increased by decreasing the strains in the material. G.H.Majzoobi et al investigated the impact of notch geometry on the fatigue life of high strength and low strength steels. It was further concluded that, the smaller the tip radius and open angle of notch, lower the fatigue life of shaft with a circumferential notch. Xuteng Hu et al studied the Effect of notch geometry on the fatigue strength of TC4 titanium alloy and concluded that notch with small radius can lead to high stress concentration and seriously reduce the HCF strength. Yoshiaki Akiniwa et al studied the effect of notch on fatigue strength reduction of bearing steel in very high cycle regime and proved that for circumferentially notched specimens, fatigue fracture originated from the surface or very close to the surface. The extent of reduction was observed to be smaller at longer lives [8]
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