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pro-EMFATIC Overview

pro-EMFATIC is a software product that predicts material life, fatigue damage, and safety factors of mechanical components in a wide variety of products, based on “crack-initiation” fatigue calculations. pro-EMFATIC provides more than a dozen life criteria for fatigue evaluations, covering most of the common methods used in industries for durability prediction. It also comes with a build-able fatigue material library of more than 210 common materials.

pro-EMFATIC can be used as a standalone calculator by simply inputting stress or strain values or time histories. It can also be seamlessly integrated with finite element software, filling the void of fatigue calculations in finite element software; it currently supports FEMAP, ANSYS, and RecurDyn.

pro-EMFATIC can be used to calculate uniaxial, biaxial and multiaxial fatigue. The user can choose the corresponding criterion according to the loading type.

  • User Input Values

When this option is chosen, one can define a loading cycle by keying in either min/max stress (or strain) or mean/amplitude of stress (or strain). Based on the stress/strain cycle keyed in by the user, the software calculates life, damage, and/or safety factors.

  • User Input Time History

When this option is chosen, one can define a loading cycle by importing stress (or strain) time history. Based on the stress/strain cycle defined by the time history, the software calculates life, damage, and/or safety factors.

User can calculate multiple elements of damage or life at the same time by selecting multiple columns of CSV file.

  • Select from Finite Element software

When this option is chosen, one can define a loading cycle using FEA stress (or strain) results in a finite element software. Based on the stress/strain cycle defined by the time history, the software calculates and displays (by contour plots) life, damage, and/or safety factors for the groups of elements selected by the user.

pro-EMFATIC System Requirements

Hardware:

  • Intel /AMD 2.0GHz or above
  • Memory 512M or above

Operating System:

  • Windows XP (sp2 or above), Windows 7
  • 32-bit or 64-bit

FEMAP Integrated Module Demo

under construction…

User Input Values

Fatigue life and damage are to be predicted at a localized critical area of a mechanical component. It is under a cyclic loading with mean stress σm = 189MPa and stress amplitude σa = 129MPa; the material of the part is H11/660 of SAE1099J. This tutorial shows how to input the max/min stresses of the loading cycle for Morrow Stress Life evaluation and then calculate the Goodman safety factor.

Step 1: Calculate the max/ min stresses from mean/alternating stresses.

σmaxm + σa = 318MPa

σminm – σa = 60MPa

Step 2: Launch pro-EMFATIC, and select the “User Input Value” option.

Step 3: Set up the input method as “Min-Max” in the “General” page of the “Preferences” dialog.

Step4: Select “mm-N” Units system, and Click “OK” button.

Step 5: Select Morrow Stress Life for fatigue evaluations.

Step6: Choose H11/660 from the <SAE.xml> material library.

Step 7: Key in min/max stress values, and click the “Calculate” button for fatigue calculations.

Step 8: View the life and damage logged in the “evaluation region”.

Step 9: Choose “Safety Factor”, and then select “Goodman” method. Make sure that Max Stress is 318MPa and Min Stress is 60MPa in the input region, then click “Calculate” button for the safety factor calculation.

Step10: View the result of “Safety Factor” logged in the “evaluation region”.

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For a free trial of pro-EMFATIC, please contact your local distributor. Or, fill out and send us the following form, and we will help you locate a local distributor. Thank you.
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Which functions would you prefer
 User input single value User input time history Biaxiality Calculate Mode FEMAP, Ansys or RecurDyn Interface

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Please read the follows agreement carefully before you use this software:

1. The company only grants you a limited, non-exclusive, non-transferable, right to use the software. This right cannot to be reauthorized. You may not distribute, reauthorize or sell the software; to do so constitutes an infringement of the company.
2. You must use the software within legally permitted limits. You may not use the software for any illegal activity.
3. The software includes the copyright, trade secrets, and other legal rights. You may not make any amendments to, alter the engineering of, disassemble, or decompile the software. You also may not produce derivative products or other products based on the software development or extraction of the software components.
4. The company reserves all the rights and interests of the software. The company may cancel the user’s software right by notifying the user or issuing a post on the company’s website.
5. Under no circumstance is the company responsible to the user for the user dissatisfaction arising from the software’s function or ability not fulfilling the user’s needs, or any other reason.
6. This agreement complies with Chinese law. You irrevocably agree that all disputes registered with the company are under court jurisdiction.

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User Input Uniaxial Time History

A time history of 3 strain tensors on the critical area of a mechanical part is measured by a strain gauge; the part is made of MANTEN material in the <SAE.xml> library. This tutorial shows how to evaluate life using the uniaxial mode. The Morrow strain life criterion is selected, and the most damaged direction should be calculated automatically by the software.

Step 1:Write the strain gauge results into a CSV (Comma Separated Values) file — “Strain.CSV”. The time history of strain is stored column-wise in the CSV file as in the following. The 1st value is the X-axis strain ,the 2nd value is the Y-axis strain , and the 3rd value is shear strain of XY plane.

Step 2:Set up pro-EMFATIC for “User Input Time History” and set the preferences of the uniaxial time history mode as “stress/strain tensors (Z-axis is normal to the evaluation plane), and loading direction(on the plane)will be determined by the software”.

Step 3:Choose Strain life(Morrow)as the life criterion;

Step 4:Choose MANTEN from the <SAE.xml> material library;

Step 5:Select “Strain.CSV” as the input file of the strain tensor history;

Step6:Set up the “Searching Range on XY Plane” as 0 degree ± 45degrees, and set “Searching increment” at 5 degrees;

Step7:Check the “Strain Tensor History1(Output)”;

Step8:Click “Evaluate” button to start calculating fatigue items;

Step9:From the output window, user can find the most damaged direction angle from the X-axis, and also find the damage and number of recurrences to failure.

Step10:User also will find the output CSV file from the working directory.

Introduction

The definition of “fatigue” according to ASTM Standard E 1150 reads as follows: “The process of progressive localized permanent structural damage occurring in a material subjected to conditions that produce fluctuating stresses and strains at some point or points and that may culminate in cracks or complete fracture after a sufficient number of fluctuations.”

Each year, damages from material fatigue and fractures cost the U.S. economy billions of dollars! Since material fatigue is one of the most common causes of structural failure, in order to maximize product durability and avoid the costly and often disastrous consequences due to fatigue failure, fatigue analysis is imperative. pro-EMFATIC provides a comprehensive and efficient way to predict material fatigue and structural life, thereby advancing your research, design, and development.

What is pro-EMFATIC for FEMAP?

pro-EMFATIC is a comprehensive, Windows-based fatigue analysis and life prediction software.  Using strain and stress data obtained through testing or FE calculations, pro-EMFATIC provides a comprehensive and efficient way to calculate material fatigue and predict structural life. It calculates fatigue damage, life and safety factors. It supports various fatigue calculation methods used by different industries.

pro-EMFATIC is offered in four different modes:

1) pro-EMFATIC_i, which is a comprehensive durability software package supporting ANSYS, ABAQUS, MSC Nastran, and NX Nastran.

2) pro-EMFATIC_f, a.k.a. pro-EMFATIC for FEMAP, which is an integrated module with FEMAP, a Windows-based finite element analysis software package.

3) pro-EMFATIC_t, which is a Windows applet that calculates various durability results based on measured stress or strain values (or time histories).

4) pro-EMFATIC_sdk, which is a Software Development Kit (SDK) that can be used by other commercial FEA and/or in-house software for durability assessments.

The latest version is pro-EMFATIC  v2.5.

User Input Biaxial Time History

A time history of 3 strain tensors on the critical area of a mechanical part is measured by a strain gauge; the part is made of Manten material in the <SAE.xml> library. This tutorial shows how to evaluate life using the Biaxial model. The SWT strain life criterion is selected. In this tutorial, the calculation primary direction is rotated 30 degrees from the X-axis about Z-axis.

Step 1:Write the strain gauge results into a CSV (Comma Separated Values) file “strain.CSV”. The time history of strain is stored column-wise in the CSV file as in the following. The 1st value is the X-axis strain , the 2nd value is the Y-axis strain , and the 3rd value is shear strain of the XY plane.

Step 2:Set up pro-EMFATIC for “User Input Time History”, and set the preferences of Biaxial Time History mode as “stress/strain tensors (Z-axis is normal to the evaluation plane) and loading direction(on the plane)”.

Step 3:Choose Strain life(Smith-Watson-Topper)as the life criterion;

Step 4:Choose MANTEN from the <SAE.xml> material library;

Step 5:Select “Strain.CSV” as the input file of the strain tensor history;

Step6:Set up the “Angle from X-axis ” as 30 degrees;

Step7:Check the “Strain Tensor History1(Output)” and “Strain Tensor History2(Output)”;

Step8:Click “Evaluate” button to start calculating fatigue items;

Step9:From the output window, user can find the angle from X-axis, and also find the damage and number of recurrences to failure.

Step10:User will also find the 2 output CSV files from the working directory.