Kyle Hamilton | Staff Mechanical Engineer Chris Johnson | … · 2017. 2. 9. · Kyle Hamilton | Staff Mechanical Engineer Chris Johnson | Program Developer. Introduction to Fatigue

Explore Fatigue Essentials A Seminar for Fatigue Users Tired of Spreadsheets

Kyle Hamilton | Staff Mechanical Engineer

Chris Johnson | Program Developer

Introduction to Fatigue Essentials 2017

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TABLE OF CONTENTS

1. OVERVIEW OF WORKFLOW .......................................................................................................................................... 4

2. SIMPLE FATIGUE ANALYSIS .......................................................................................................................................... 5

2.1 PROJECT INFO ...................................................................................................................................................................................................5

2.2 LOAD CASES .....................................................................................................................................................................................................6

2.3 SPECTRUM EDITOR ............................................................................................................................................................................................7

2.4 MATERIALS LIBRARY...........................................................................................................................................................................................8

2.5 CREATE ANALYSIS ..............................................................................................................................................................................................9

2.6 VIEW RESULTS ................................................................................................................................................................................................10

2.7 HTML REPORT ...............................................................................................................................................................................................11

3. FATIGUE ESSENTIALS FEMAP PLUGIN ......................................................................................................................... 12

3.1 IMPORT TO FATIGUE ESSENTIALS ........................................................................................................................................................................13

3.2 VIEW LOAD CASES ...........................................................................................................................................................................................14

3.3 SPECTRUM EDITOR ..........................................................................................................................................................................................15

3.4 MATERIALS LIBRARY.........................................................................................................................................................................................16

3.5 ANALYSIS .......................................................................................................................................................................................................17

3.6 EXPORT TO FEMAP ........................................................................................................................................................................................18

4. SUMMARY.................................................................................................................................................................. 19

5. SEMINAR Q & A .......................................................................................................................................................... 20



1. OVERVIEW OF WORKFLOW

Fatigue Essentials utilizes a navigation tree similar to FEMAP and other analysis programs. This tree is meant to be

navigated from top to bottom. The user inputs the load cases, fatigue spectrum, material information, and then runs the

analysis.



2. SIMPLE FATIGUE ANALYSIS

Let’s start by taking a look at how to do a full analysis in Fatigue Essentials from start to finish.

2.1 PROJECT INFO

The Project Editor allows the user to add details of who worked on the analysis. You can edit all fields and add additional text or date fields.



2.2 LOAD CASES

The Load Case Editor is the place where you define the stresses that your structure experiences. The order which you add them doesn’t matter; we will choose how they are applied in the Spectrum Editor.



2.3 SPECTRUM EDITOR

With our load cases defined, we can now create a load spectrum for the fatigue analysis. The editor allows you to define your spectrum from load cases in blocks, and choose separate repeats for each block. In the spectrum editor you choose the total number of repeats for your spectrum.



2.4 MATERIALS LIBRARY

Now that we have our load cases we can create the materials library. Note that after creating your materials, you can

save the library to be used in a later Fatigue Essentials session.

Library Organization

User Reference

Used for Analysis

Clips the S-N Curve

Used in Goodman Stress Correction



2.5 CREATE ANALYSIS

In the Analysis Editor you choose your scatter factor, Spectrum, Material, Units, Cycle Counting Method, and Retained Stress Pairs. You can also add the stress modification factors as desired.



2.6 VIEW RESULTS

With the analysis completed we can take a look at the results. The total damage is 0.83 which means the structure passes.



2.7 HTML REPORT

Finally, when you’re satisfied with your analysis, you can write the results out to an HTML report.



3. FATIGUE ESSENTIALS FEMAP PLUGIN

The process for fatigue analysis with a FEMAP model is similar to the previous simple analysis. With the FEMAP plugin

enabled your Load Cases are created from the output sets in FEMAP.



3.1 IMPORT TO FATIGUE ESSENTIALS

After clicking the button to select output sets and nodes you will jump over to FEMAP. Here you can choose the output

sets and nodes which will define your stress details, and load cases.



3.2 VIEW LOAD CASES

After importing the selected load cases from FEMAP select Modify Stresses and Load Cases to view the imported data. Each node will appear as a Stress Detail, and each selected load case will import as a load case for that Stress Detail.



3.3 SPECTRUM EDITOR

With the Load Cases imported, the next step is to create the load spectrum. To keep it simple in this example we will

cycle between compression and tension with 4,000 repeats.



3.4 MATERIALS LIBRARY

From this point the analysis is the same as what we previously looked at. We can load the materials library from the

previously saved session.



3.5 ANALYSIS

You will find that the analysis takes a bit longer than the previous analysis, depending on the number of nodes and

repeats that you have chosen.



3.6 EXPORT TO FEMAP

With your analysis complete, you are ready to push the fatigue damage back to FEMAP. Open up the FEMAP interface



4. SUMMARY

This seminar has covered a brief overview of our Fatigue Essentials tool. We hope it is a tool that you will find useful in your fatigue workflow to reduce errors and increase efficiency of fatigue analysis.

If you have any questions, or would like to purchase Fatigue Essentials please reach out to our team.

General Questions Kyle Hamilton [email protected]

Sales Erik Barber [email protected]

Program Comments Chris Johnson [email protected]

Fatigue Specific Brian Reiling [email protected]

mailto:[email protected]






5. SEMINAR Q & A

Questions?

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Kyle Hamilton | Staff Mechanical Engineer Chris Johnson | … · 2017. 2. 9. · Kyle Hamilton | Staff Mechanical Engineer Chris Johnson | Program Developer. Introduction to Fatigue