Fatigue curve parameters description of AISI 1141 Microalloyed Steel using Gatts equation, Exponential & Hyperbolic function

Abstract

Fatigure is observed to be one of the major reasons for failure of mechnical components subjected to cyclic load. Micro-alloying of steel is usually done in order to improve its fatigue strength. Micro-alloyed steel contains small quantity of alloying elements such as niobium, vanadium, molybdenum, zirconium, titanium, boron, and rare-earth metals. Motivation of the present work is to find the exact number of cycles to failure for a given stress. The fatigue curve can be described by Gatts equation, exponential function and hyperbolic function. The exactness of each method is checked by three stress level analysis. Gatts equation is a better tool to describe the fatigue curve at high levels of stresses which is near to ultimate stress.

Keywords

• Endurance limit
• Gatts equation
• Microalloyed steel.