MSC - MSC Patran MSC Nastran Preference Guide - Volume 1 - Structural Analysis [MSC]

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<p>C O N T E N T SMSC.Patran MSC.Nastran Preference Guide Volume 1: Structural AnalysisCHAPTERMSC.Patran MSC.Nastran Preference Guide, Volume 1: Structural Analysis</p> <p>1Overviews s</p> <p>Purpose, 2 MSC.Nastran Product Information, 3</p> <p>2Building A Models s s</p> <p>Introduction to Building a Model, 6 Currently Supported MSC.Nastran Input Options, 8 Adaptive (p-Element) Analysis with the MSC.Patran MSC.Nastran Preference, 11 Coordinate Frames, 15 Finite Elements, 16 Nodes, 17 Elements, 18 Multi-point Constraints, 19 - Degrees of Freedom, 22 Superelements, 34 - Select Boundary Nodes, 35 Material Library, 36 Materials Form, 37 - Isotropic, 42 - 2D Orthotropic, - 3D Orthotropic, - 2D Anisotropic, - 3D Anisotropic, - Composite, 61 - Laminated, 62</p> <p>s s</p> <p>s</p> <p>54 58 59 60</p> <p>s</p> <p>Element Properties, 63 Element Properties Form, 64 - Coupled Point Mass (CONM1), 67 - Grounded Scalar Mass (CMASS1), 69 - Lumped Point Mass (CONM2), 70 - Grounded Scalar Spring (CELAS1), 72 - Grounded Scalar Damper (CDAMP1), 73 - Bush, 74 - General Section Beam (CBAR), 77 - P-Formulation General Beam (CBEAM), 80 - Curved General Section Beam (CBEND), 84 - Curved Pipe Section Beam (CBEND), 86</p> <p>s</p> <p>Lumped Area Beam (CBEAM/PBCOMP), 88 Tapered Beam (CBEAM), 90 General Section (CBEAM), 93 General Section Rod (CROD), 98 General Section Rod (CONROD), 99 Pipe Section Rod (CTUBE), 100 Scalar Spring (CELAS1), 101 Scalar Damper (CDAMP1), 102 Viscous Damper (CVISC), 103 Gap (CGAP), 104 Scalar Mass (CMASS1), 106 PLOTEL, 107 Scalar Bush, 108 Standard Homogeneous Plate (CQUAD4), 111 Revised Homogeneous Plate (CQUADR), 113 P-Formulation Homogeneous Plate (CQUAD4), 114 Standard Laminate Plate (CQUAD4/PCOMP), 116 Revised Laminate Plate (CQUADR/PCOMP), 117 Standard Equivalent Section Plate (CQUAD4), 118 Revised Equivalent Section Plate (CQUADR), 120 P-Formulation Equivalent Section Plate (CQUAD4), 122 Standard Bending Panel (CQUAD4), 125 Revised Bending Panel (CQUADR), 127 P-Formulation Bending Panel (CQUAD4), 128 Axisymmetric Solid (CTRIAX6), 130 Standard Plane Strain Solid (CQUAD4), 131 Revised Plane Strain Solid (CQUADR), 132 P-Formulation Plane Strain Solid (CQUAD4), 133 Standard Membrane (CQUAD4), 135 Revised Membrane (CQUADR), 136 P-Formulation Membrane (CQUAD4), 137 Shear Panel (CSHEAR), 139 Solid (CHEXA), 140 P-Formulation Solid (CHEXA), 141 Hyperelastic Plane Strain Solid (CQUAD4), 143 Hyperelastic Axisym Solid (CTRIAX6), 144 Hyperelastic Solid (CHEXA), 145</p> <p>Beam Modeling, 146 Cross Section Definition, 146 Cross Section Orientation, 150 Cross Section End Offsets, 151 Stiffened Cylinder Example, 152 Loads and Boundary Conditions, 153 Loads &amp; Boundary Conditions Form, 154 - Object Tables, 158 Load Cases, 167 Defining Contact Regions, 168 Contact, 169</p> <p>s</p> <p>s s</p> <p>3Running an Analysiss</p> <p>Review of the Analysis Form, 172 Analysis Form, 173 Overview of Analysis Job Definition and Submittal, 175 Translation Parameters, 176 Translation Parameters, 177 Numbering Options, 178 Select File, 179 Solution Types, 180 Direct Text Input, 182 Solution Parameters, 183 Linear Static, 183 Nonlinear Static, 186 Normal Modes, 188 Buckling, 194 Complex Eigenvalue, 198 Frequency Response, 203 Transient Response, 206 Nonlinear Transient, 209 Subcases, 211 Deleting Subcases, 212 Editing Subcases, 213 Subcase Parameters, 214 Linear Static Subcase Parameters, 215 Nonlinear Static Subcase Parameters, 216 Arc-Length Method Parameters, 218 Subcases Nonlinear Transient Subcase Parameters, 219 Normal Modes Subcase Parameters, 221 Transient Response Subcase Parameters, 223 Frequency Response Subcase Parameters, 226 Output Requests, 231 Basic Output Requests, 232 Advanced Output Requests, 233 Edit Output Requests Form, 242 Default Output Request Information, 244 - Subcases Direct Text Input, 247 Select Superelements, 248 Select Explicit MPCs..., 249 Subcase Select, 250 Restart Parameters, 251 Optimize, 254 Optimization Parameters, 255 Subcases, 256 - Subcase Parameters, 257 Subcase Select Optimize, 258 Interactive Analysis, 259</p> <p>s</p> <p>s s s</p> <p>s</p> <p>s</p> <p>s</p> <p>s s s s s</p> <p>s</p> <p>Analysis Form, 261 Select Modal Results .DBALL, 262 Loading Form, 263 Create a Field Form, 265 Output Selection Form, 266 Define Frequencies Form, 267</p> <p>4Read Resultss s s s s</p> <p>Overview of Reading Results, 270 Read Output2, 271 Attach XDB, 274 Supported OUTPUT2 Result and Model Quantities, 277 Supported MSC.Access Result Quantities, 285</p> <p>5Read Input Files</p> <p>Review of Read Input File Form, 312 Read Input File Form, 313 Entity Selection Form, 314 Define Offsets Form, 316 Selection of Input File, 317 Summary Data Form, 318 Reject Card Form, 319 Data Translated from the NASTRAN Input File, 320 Coordinate Systems, 321 Grids and SPOINTs, 322 Elements and Element Properties, 323 Materials, 327 MPCs, 328 Load Sets, 329 TABLES, 331 Conflict Resolution, 332 Conflict Resolution for Entities Identified by IDs, 332 Conflict Resolution for Entities Identified by Names, 332</p> <p>s</p> <p>s</p> <p>6Deletes s</p> <p>Review of Delete Form, 334 Deleting an MSC.Nastran Job, 335</p> <p>7Filess</p> <p>Files, 338</p> <p>8Errors/Warningss</p> <p>Errors/Warnings, 342</p> <p>APreference Configuration and Implementations s s</p> <p>Software Components in MSC.Patran MSC.Nastran, 344 MSC.Patran MSC.Nastran Preference Components, 345 Configuring the MSC.Patran MSC.Nastran Execute File, 348 MSC.Patran MSC.Nastran Preference Guide, 349 Volume 1: Structural Analysis</p> <p>INDEX</p> <p>s</p> <p>MSC.Patran MSC.Nastran Preference Guide, Volume 1: Structural Analysis</p> <p>CHAPTER</p> <p>1</p> <p>Overview</p> <p>s Purpose s MSC.Nastran Product Information</p> <p>1.1</p> <p>PurposeMSC.Patran is an analysis software system developed and maintained by MSC.Software Corporation. The core of the system is a finite element analysis pre and postprocessor. Several optional products are available including; advanced postprocessing programs, tightly coupled solvers, and interfaces to third party solvers. This document describes one of these interfaces. The MSC.Patran MSC.Nastran interface provides a communication link between MSC.Patran and MSC.Nastran. It also provides for the customization of certain features in MSC.Patran. The interface is a fully integrated part of the MSC.Patran system. Selecting MSC.Nastran as the analysis code preference in MSC.Patran, activates the customization process. These customizations ensure that sufficient and appropriate data is generated for the MSC.Patran MSC.Nastran interface. Specifically, the MSC.Patran forms in these main areas are modified:</p> <p> Materials Element Properties Finite Elements/MPCs and Meshing Loads and Boundary Conditions Analysis FormsMore information on these topics is contained in Preference Configuration and Implementation (App. A).</p> <p>CHAPTER 1Overview</p> <p>1.2</p> <p>MSC.Nastran Product InformationMSC.Nastran is a general-purpose finite element computer program for engineering analyses. It is developed, supported, and maintained by MSC.Software Corporation, 815 West Colorado Boulevard, Los Angeles, California 90041, (323) 258-9111. See the MSC.Nastran Users Manual, Volume 1, for a general description of MSC.Nastrans capabilities.</p> <p>MSC/PATRAN MSC/NASTRAN Preference Guide, Volume 1: Structural Analysis</p> <p>CHAPTER</p> <p>2</p> <p>Building A Model</p> <p>s Introduction to Building a Model s Currently Supported MSC.Nastran Input Options s Adaptive (p-Element) Analysis with the MSC.Patran MSC.Nastran Preference s Coordinate Frames s Finite Elements s Material Library s Element Properties s Beam Modeling s Loads and Boundary Conditions s Load Cases s Defining Contact Regions</p> <p>2.1</p> <p>Introduction to Building a ModelThere are many aspects to building a finite element analysis model. In several cases, the forms used to create the finite element data are dependent on the selected analysis code and analysis type. Other parts of the model are created using standard forms. The Analysis option on the Preferences menu brings up a form where the user can select the analysis code (e.g., MSC .Nastran) and analysis type (e.g., Structural).</p> <p>MSC.PatranFile Group Viewport Viewing Display Preferences Tools Insight Control Help</p> <p>Preferences Geometry FEM LBCs Matls Properties Load CasesFields Analysis Results Insight XYPlot Analysis... Global... Graphics... Mouse... Key Map... Picking... Report... Geometry... Finite Element... Insight... Hide Icon Help Main Form...</p> <p>$# Session file started recording at 25 $# Recorded by MSC.Patran 03:36:58 PM $# FLEXlm Initialization complete. Acquiring license(s)... hp, 2</p> <p>The analysis code may be changed at any time during model creation.This is especially useful if the model is to be used for different analyses in different analysis codes. As much data as possible will be converted if the analysis code is changed after the modeling process has begun. The analysis option defines what will be presented to the user in several areas during the subsequent modeling steps.</p> <p>CHAPTER 2Building A Model</p> <p>These areas include the material and element libraries, including multi-point constraints, the applicable loads and boundary conditions, and the analysis forms. The selected Analysis Type may also affect the allowable selections in these same areas. For more details, see The Analysis Form (Ch. 2) in the MSC.Patran Reference Manual, Part 5: Analysis Application. Analysis PreferenceAnalysis Code: MSC.Nastran Analysis Type: Structural Input File Suffix: .bdf Output File Suffix: .op2 Indicates the file suffixes used in creating file names for MSC.Nastran input and output files. The only currently supported Analysis Type for MSC.Patran MSC.Nastran is Structural. To use the MSC.Patran MSC.Nastran Application Preference, this should be set to MSC.Nastran.</p> <p>OK</p> <p>2.2</p> <p>Currently Supported MSC.Nastran Input OptionsThe following tables summarize all the various MSC. Nastran commands supported by the MSC.Patran MSC.Nastran Application Preference. The tables indicate where to find more information in this manual on how the commands are supported. Supported MSC.Nastran File Management Commands CommandASSIGN</p> <p>Description An ASSIGN command is used to assign a particular name (job name + user specified MSC .Nastran results suffix) to the MSC .Nastran OUTPUT2 file to be created during the analysis.</p> <p>Supported MSC.Nastran Executive Control Commands CommandECHO SOL TIME</p> <p>Pages 183, 186, 188, 194, 198, 203, 206, 209 180 183, 186, 188, 194, 198, 203, 206, 209</p> <p>Supported MSC.Nastran Case Control Commands</p> <p>CommandACCELERATION ADACT ADAPT DATAREC DISPLACEMENT ELSDCON ESE FORCE</p> <p>Pages 203, 206 13, 215 12, 141 13 183, 194, 203, 206 183 183 183, 188, 194, 201, 203, 206 203 233 183, 186, 188, 194, 198, 203, 206, 209 233</p> <p>CommandOLOAD SPCFORCES</p> <p>Pages 183, 194, 203, 206 183, 188, 194, 201, 203, 206 183, 188, 194, 201, 203, 206 183, 188, 194, 201, 203, 206 188, 194 203, 206 183 183 233 234 234 234</p> <p>STRAIN</p> <p>STRESS</p> <p>VECTOR VELOCITY GPSDCON GPFORCE NLLOAD SET SURFACE VOLUME</p> <p>FREQUENCY GPSTRESS MAXLINES</p> <p>MPCFORCES</p> <p>CHAPTER 2Building A Model</p> <p>Supported MSC.Nastran Bulk Data Entries</p> <p>CommandADAPT BCONP BFRIC BFRIC CBARAO CBAR CBEAM CBEND CDAMP1 CDAMP2 CELAS1 CELAS2 CGAP CHEXA CMASS1 CMASS2 CONM1 CONM2 CONROD CPENTA CQUAD4 CQUAD8 CQUADR CROD CSHEAR CTETRA CTRIAX6 CTUBE</p> <p>Pages 12, 141, 180, 186 169</p> <p>CommandCVISC DYNRED EIGB</p> <p>Pages 103 193 196, 191 201 191 191 11 11 159 203 158 163 159 312 312 312 312 312 23 216 13, 233 183, 186, 188, 194, 198, 203, 206, 209 183 183 183, 186, 188, 194, 198, 203, 206, 209 183, 186, 188, 194, 198, 203, 206, 209</p> <p>169 169 77</p> <p>EIGC EIGR EIGRL</p> <p>77 88, 90</p> <p>FEFACE FEEDGE</p> <p>84, 86FORCE</p> <p>73 177, 326</p> <p>FREQ1 GMBC</p> <p>72GRAV</p> <p>177, 326 104</p> <p>MOMENT MAT1</p> <p>140MAT2</p> <p>106 177, 326</p> <p>MAT3 MAT8</p> <p>67MAT9</p> <p>70 99</p> <p>MPC NLPARM</p> <p>140OUTPUT</p> <p>111, 118, 125, 131, 135 111, 118, 125, 131, 135 113, 120, 127, 132, 136 98 139 140 130 100</p> <p>PARAM, AUTOSPC PARAM, INREL PARAM, ALTRED PARAM, COUPMASS PARAM, K6ROT</p> <p>CommandPARAM, WTMASS PARAM, GRDPNT PARAM, LGDISP PARAM,G PARAM,W3 PARAM,W4 PARAM, POST PBAR PBCOMP PBEAM PBEND PCOMP PDAMP PELAS PGAP PLOAD1 PLOAD2 PLOAD4 PLOADX1 PLOTEL PMASS POINT PROD</p> <p>Pages 183, 186, 188, 194, 198, 203, 206, 209 183, 186, 188, 194, 198, 203, 206, 209 186, 209 198, 203, 206, 209 206, 209 206, 209 176 77 88 90 84, 86 116, 117 73 72 104 165 159 159 159, 149 107 106 11, 141 98</p> <p>CommandPSHEAR PSHELL</p> <p>Pages 139 111, 113, 118, 120, 125, 127, 131, 132, 135, 136 140 100 90 11, 141 103 25 26 27 28 163 29 30 31 34 158 158 161 146 161 161 164, 164 206 209, 219</p> <p>PSOLID PTUBE PBEAM PVAL PVISC RBAR RBE1 RBE2 RBE3 RFORCE RROD RSPLINE RTRPLT SESET SPC1 SPCD TEMP TEMPF TEMPRB TEMPP1 TIC TSTEP TSTEPNL</p> <p>CHAPTER 2Building A Model</p> <p>2.3</p> <p>Adaptive (p-Element) Analysis with the MSC.Patran MSC.Nastran PreferenceIn Version 68 of MSC .Nastran, MSC introduced p-adaptive analysis using solid elements. The MSC.Patran MSC.Nastran Preference provides support for this new capability. There are some fundamental differences in approach to model building and results import for p-element analyses; this section will serve as a guide to these. MSC .Nastran Version 69 extends the Version 68 capabilities for p-adaptive analysis in two areas. Shell and beam elements have been added and p-shells and p-beams can be used for linear dynamic solution sequences. MSC.Patran Version 6.0 supports both of these capabilities. Element Creation. MSC . Nastran supports adaptive, p-element analyses with the 3D-solid CTETRA, CPENTA, and CHEXA elements; 2D-solid TRIA, and QUAD elements; shells TRIA, and QUAD elements; beams BAR elements. MSC.Patran and MSC .Nastran allow TET4, TET10, TET16, TET40, WEDGE6, WEDGE15, WEDGE52, HEX8, HEX20, and HEX64 for p-adaptive analysis for 3D-solids; TRIA3, TRIA6, TRIA7, TRIA9, TRIA13, QUAD4, QUAD8, QUAD9, QUAD12, and QUAD16 for p-adaptive analysis for 2D-solids and membranes; TRIA3, TRIA6, TRIA7, TRIA9, TRIA13, QUAD4, QUAD8, QUAD9, QUAD12, and QUAD16 for p-adaptive analysis for shells; BAR2, BAR3, and BAR4 for p-adaptive analysis for beams. The preferred approach, when beginning a new model, is to use the higher-order elements--HEX64, WEDGE52, TET40, and TET16, or TRIA13 and QUAD16, or BAR4. The support for lower-order elements is provided primarily to support existing models. The higher-order cubic elements allow more accurate definition of the geometry and more accurate postprocessing of results from the MSC .Nastran analysis.The translator generates the appropriate MSC .Nastran FEEDGE and POINT entities for all curved edges on the p-elements. Models with HEX64 and WEDGE52 elements are easily created with the MSC.Patran Iso Mesher; models with TET16 elements can be created with the Tet Mesher. Models with QUAD16 and TRIA13 elements can be created using the Iso Mesher or the Paver. For p-elements, MSC.Patran generates cubic edges to fit the underlying geometry. The cubic edge consists of two vertex grid points and two points in between. A...</p>


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