Quick Fatigue

Analysis Guide This guide is made for non-experienced FEA users. It provides basic knowledge needed to start your fatigue calculations quickly. Experienced FEA can also use this guide to get used to NFX workflow.

TABLE OF CONTENTS:

What is Fatigue? 3

Fatigue Design Philosophy 4

Life Estimation Methods 5

Fatigue Loading 6

-N Curve 7

Stress Life approach 8

Strain Life approach 9

Strain Life Curve 10

Fatigue Workflow in midas NFX 11

Fatigue Module 12

Approach Selection, Stress Option 13

Fatigue Property, Mean Stress Correction 14

Load/Stress History 15

Fatigue Results 16

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Fatigue failure is defined as the tendency of a material to

fracture by means of progressive brittle cracking under

repeated alternating or cyclic stresses of an intensity

considerably below the normal strength.

Although the fracture is of a brittle type, it may take some

time to propagate, depending on both the intensity and

frequency of the stress cycles.

All structures and mechanical components that are cyclically

loaded can fail by fatigue.

Fundamental requirements during design and manufacturing

to avoid fatigue failure are different for each different case

and should be considered during the design phase.

What is Fatigue Failure?

Page 3

Examples of fatigue failure

1

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