 # Fatigue Life Equation – How to Go About It?

Are you concerned about the fatigue life of your products? Do you want to ensure that your products will withstand the rigours of use and still perform as expected? If so, then you need to understand the fatigue life equation. The fatigue life equation in product development is essential in designing a product. This article will give you a better understanding of the fatigue life equation and how to calculate it.

## What Is The Fatigue Life Equation?

The fatigue life equation is a mathematical equation that calculates the fatigue life for material. It is calculated by dividing the total fatigue stress (S) by the total number of cycles (N). To ensure that your product will last long enough, you must calculate its fatigue life. The equation considers the material’s yield strength, the applied stress, and the number of cycles to failure.

Mathematically, the fatigue life equation is written as:

S/N = fatigue life

## How to Calculate Fatigue Life?

Several empirical equations can be used to calculate the fatigue life of a material. Still, the most accurate method is to test the material in a laboratory under controlled conditions. To calculate the fatigue life of a material, first determine the maximum stress the material will be subjected to during its intended use. Next, select the number of stress cycles that the material will experience during its intended use. Finally, divide the maximum stress by the number of stress cycles to determine the fatigue life of the material.