Hide Table of Contents


Endurance Limit

As the alternating stress gets smaller, the material can take more stress cycles before it fails due to fatigue. The endurance limit is the highest alternating stress that does not result in fatigue failure. In other words, if the alternating stress is equal to or lower than the endurance limit, the number of stress cycles to cause failure becomes very large (practically infinite). The endurance limit is usually defined for zero-mean alternating stresses. The endurance limit is also called the fatigue limit. Some metals do not have a measurable endurance limit.

Alternating Stress

The alternating stress is defined as (s max - s min)/2 where s max and s min are the maximum and minimum stresses respectively.

Stress Range

Stress =  (smax - smin)

Mean Stress

Mean stress = Sm = (smax + smin)/2

Mean stress correction

Stress Ratio

Stress ratio =  smin/smax

Fatigue Life

Fatigue life, at a given alternating stress level and mean, is the number of cycles required to cause failure due to fatigue.

Fatigue Strength

The stress at which fatigue failure occurs after a given number of  loading cycles.

Related Topics

Fatigue Analysis

Fatigue Events

Performing Fatigue Analysis

Fatigue Plots

Provide feedback on this topic

SOLIDWORKS welcomes your feedback concerning the presentation, accuracy, and thoroughness of the documentation. Use the form below to send your comments and suggestions about this topic directly to our documentation team. The documentation team cannot answer technical support questions. Click here for information about technical support.

* Required

Subject:   Feedback on Help Topics
Page:   Definitions
*   I acknowledge I have read and I hereby accept the privacy policy under which my Personal Data will be used by Dassault Systèmes

Print Topic

Select the scope of content to print:


We have detected you are using a browser version older than Internet Explorer 7. For optimized display, we suggest upgrading your browser to Internet Explorer 7 or newer.

 Never show this message again

Web Help Content Version: SOLIDWORKS 2012 SP05

To disable Web help from within SOLIDWORKS and use local help instead, click Help > Use SOLIDWORKS Web Help.

To report problems encountered with the Web help interface and search, contact your local support representative. To provide feedback on individual help topics, use the “Feedback on this topic” link on the individual topic page.