S3-1 PAT318, Section 3, March 2005 SECTION 3 MSC.FATIGUE USER INTERFACE

S3-2 PAT318, Section 3, March 2005

S3-3 PAT318, Section 3, March 2005 The Three Inputs The AnalysisThe Answer! THE FIVE BOX FATIGUE LIFE ANALYSIS TRICK

S3-4 PAT318, Section 3, March 2005 OVERVIEW OF MSC/FATIGUE ANALYSIS PROCESS n Define Loading History n Define Fatigue Material Properties n Set Up and Run the Fatigue Analysis n Select Solution Parameters u Select Solution Parameters u Submit the Job u Monitor the Job Progress u Read in the Results n Evaluate Resulting Life Predictions

S3-5 PAT318, Section 3, March Import Geometry1 - Select Analysis Code 3 - Build Geometry And FEM 4 - Create Analysis Model 5 - Perform the Analysis 6 - Evaluate Analysis Results RUNNING AN FEA USING MSC.PATRAN

S3-6 PAT318, Section 3, March 2005 OR IMPORT THE MODEL AND RESULTS n Use Results from a Previous Stress Analysis n Import Nodes and Elements and Stress/Strains from the Results File (e.g..op2 for MSC/NASTRAN) n Use Model and Results Filtering to reduce Model size and Fatigue Analysis Run Times

S3-7 PAT318, Section 3, March 2005 MSC.FATIGUE MAIN FORM

S3-8 PAT318, Section 3, March 2005 MSC.FATIGUE MAIN FORM n General setup parameters are used to define generic parameters for the Fatigue job n Jobnames and Titles are used to identify Fatigue Jobs in MSC.Patran n Specific setup forms are used to specify parameters unique to fatigue analysis such as fatigue material properties, load time histories, etc. n Job control is used to submit and monitor fatigue jobs n Results is used to post-process fatigue results Geometry Materials Loading Analysis Post-Processing Optimization

S3-9 PAT318, Section 3, March 2005 Geometry Materials Loading AnalysisPost-processing Optimization METHODOLOGY

S3-10 PAT318, Section 3, March 2005 Loading Time Histories may be imported, created, modified, and displayed by clicking on the Database Manager button Result Parameters define the stress analyzers result details A Loading Time History is selected by clicking on the appropriate name in the list box LOADING INFORMATION FORM

S3-11 PAT318, Section 3, March 2005 LOADING TIME HISTORY DATABASE MANAGER: n Facilities for: u Creation (waves, point by point, graphical, etc.) u Graphical Display and Editing u Arithmetic & Graphical Manipulation u Graphical Cutting and Pasting u Automatic Units Conversion u Searching u ASCII File Import Transmission Wind Waves Suspension

S3-12 PAT318, Section 3, March 2005 LOADING TIME HISTORY DATABASE MANAGER: A typical load history showing random loading sequences Strain (uE) Time (seconds) DISPLAY OF SIGNAL: TEST102.DAC

S3-13 PAT318, Section 3, March 2005 Geometry Materials Loading AnalysisPost-processing Optimization METHODOLOGY

S3-14 PAT318, Section 3, March 2005 MATERIAL INFORMATION FORM n Fatigue Material Properties are created / reviewed by clicking on the Database Manager button n The fatigue material properties may be selected by clicking on its name in the material list box n Clicking on the O.K. button will save the specified properties and hide the form

S3-15 PAT318, Section 3, March 2005 MATERIALS DATABASE MANAGER n Facilities for u Data Entry, Deletion, & Editing u Searching on Descriptive Data u Database Entry Listing u Graphical Display u Multiple Material Designation DIN, SAE, ASTM, etc. Aluminum Steel Titanium Copper

S3-16 PAT318, Section 3, March 2005 A typical S-N curve MATERIALS DATABASE MANAGER:

S3-17 PAT318, Section 3, March 2005 SOLUTION PARAMETERS FORM n The Solution Parameter form is used to define fatigue analysis specific parameters n Clicking on O.K. will save the supplied information for future retrieval n Clicking on Cancel will close the form without saving the altered data values

S3-18 PAT318, Section 3, March 2005 JOB CONTROL FORM n Fatigue Analysis Jobs are submitted to the local host using the job control form n The Job may be monitored on a regular basis n Jobs may also be aborted from this form

S3-19 PAT318, Section 3, March 2005 Geometry Materials Loading AnalysisPost-processing Optimization METHODOLOGY

S3-20 PAT318, Section 3, March 2005 RESULTS FORM n The Fatigue results for completed jobs may be read into MSC.Patran n The results may be displayed using standard MSC.Patran post-processing functions u Results u Insight

S3-21 PAT318, Section 3, March 2005 POST-PROCESSING: RESULTS n Contour Plotting of: u Life Estimates u Log of Life u Damage u Component Specific Life Units (Flights, Miles, etc.) u Factor-or-Safety u Multiaxiality Indicators n X-Y Plots of Sensitivity Studies

S3-22 PAT318, Section 3, March 2005 POST-PROCESSING: RESULTS n Tabular Results of: u Individual Nodes/Elements u Most Damaged Nodes/Elements u Statistical Summary of Damage Distribution u Interactive Results Interrogation of All Life and Damage Estimates u Factor-or-Safety u Multiaxiality Indicators

S3-23 PAT318, Section 3, March 2005 The 20 most damgaed nodes Tabular Listing of Fatigue Results

S3-24 PAT318, Section 3, March 2005 POST-PROCESSING: HISTOGRAM PLOTS Cycles vs. Damage

S3-25 PAT318, Section 3, March 2005 POST-PROCESSING: DESIGN OPTIMIZATION n Localized Analysis for Evaluation of Alternative: u Surface Conditions u Material Types / Parameters u Statistical Confidence u Design Geometry u Loading Conditions u Residual Stresses and Stress Concentrations u Mean Stress u Design Life

S3-26 PAT318, Section 3, March 2005 POST-PROCESSING: DESIGN OPTIMIZATION n Search for Better/Worse Material n Allowables Based on Design Life n Calibration to Test Results n Sensitivity Calculations n X-Y Plotting n Histogram Plotting n User Preferences

S3-27 PAT318, Section 3, March 2005 GRAPHICAL DISPLAY OF FATIGUE RESULTS n Fatigue results may be displayed by selecting the Results switch from the top menu bar n Fatigue results include u Damage u Log of Damage u Life (repeats) u Log Life (repeats) u Life (User Defined Units) e.g. Laps, Flights, etc. u Log of Life (User Defined Units)

S3-28 PAT318, Section 3, March 2005 MSC.Fatigue Files