NASA CONTRACTOR

REPORT

NASTRAN USER'S GUIDE Level 15

Prepared' by

UNIVERSAL ANALYTICS, INC.

Los Angeles, Calif. 90045

Jor Langley Research Center

NASA CR-2S04

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON, D. C. APRil 1975

https://ntrs.nasa.gov/search.jsp?R=19750014745 2018-04-22T18:40:00+00:00Z

1. Report No. I 2. Government Accession No. 3. Recipient's catalog No. NASA CR- 2504

4. Title and Subtitle 5. Repon Date

NASTRAN User's Guide - Level 15 APRIL 1975 6. Performing Organization Code

7. Author(s) 8. Performing OrganiZation Repon No. Ailon.

10. Work Unit No. 9. Performing Organization Name and Address 502-32-01-02

Universal Analytics, Inc. 11. Contract or Grant No. 7151 West Manch~ster Avenue NASl-6024 Los Angeles, CA 90045

13. Type of Repon and Period Covered 12. Sponsoring Agency Name .and Addn;ss .. ContractorReport

National Aeronautics and Space Adminis t:dltion Washington, D.C. 20546 14. Sponsoring Agency Code

15. Su pplementary Notes

Topical Report;

16. Abstract The NASTRAN structural analysis system is the most widely used structural analysis tool in the country. More capabilities are continually being added to the system, making it the most comprehensive as well. In order that many new users can determine how to use the program quickly, this user's guide was considered an essential addition to the ori-ginal four NASTRAN manuals. Clear brief descriptions of capabilities with example input are included, with references to the location of more complete information if the user needs it. As new capability is added to the NASTRAN system (Level 15.1 is de-scribed in this first release) additional material will be published for incorporation into this user's guide.

17. Key Words (Suggested by Author(s)) 18. Distribution Statement

NASTRAN Unclassified - Unlimited Finite Elements

NewSubject Category 39 Static Structural Analysis Dynamic Structural Analysis User's Guide

19. Security Oassif. (of this repon. 20. Security Classif. (of this page) 21. No. of Pages 22. Price-

Unclassified Unclassified 231 $7.50

- For sale by the National Technical Information Service, Springfield, Virginia 22151

Page Intentionally'Left,Blan,k

FOREWORD

This NASTRAN User's Guide was prepared by Universal Analytics, Inc. (UAI) under Subcontract No. L.S.-2977-A3 with McDonnell Douglas Astronautics Company-West (MDAC) under their Contract NASI-6024 with .National Aeronautics and Space Administration, Langley Research Center; Hampton; Virgiid.ao Dr. E. I. Field of UAI served as Program Manager with Messrs. D. Herting, S. E. Johnson, and K. E. Pauley contributing significantly to the program. This work was administered under the direction of MDAC with Mr. H. Adam as the contract monitor. Mr. Ho Adelman of the NASTRAN Systems Management Office and Oro E. Stanton of MDAC served as technical monitors o

The User's Guide is designed to'assist the current and potential users of NASTRAN to make better use of the program's capabilities. The User's Guide is organized so as to present the many options available in the logical sequence in which the input data would be prepared. These options are briefly described and tabulated according to purpose to help the user select thealternative best suited to his needs. References are given for-pointing to the location in the standard documentation where detail descrip-tions may be found. The User's Guide also contains many examples illustrating typical applications of NASTRAN modeling and control features which may be used as guides to input data preparation.

The User's Guide is not intended to represent the full detail of NASTRAN's capabilities. NASTRAN provides such a flexible array of analytical options, the user will find unending combinations of alternatives. As the user becomes familiar and comfortable with the use of NASTRAN, he will want to use the more sophisti-cated features of NASTRAN. The User's Guide will serve to help direct these users to effectively apply ~heir imagination and analytical abilities. However, to keep the volume of this Guide within manageable proportions, the user is expected and encour-aged to make full use of the references provided to the three standard NASTRAN manuals.

iii

TABLE OF CONTENTS

FOREWORD . . . . . . . . . . . . . . LIST OF FIGURES

LIST OF TABLES

...

1. INTRODUCTION

2.

3.

ORIENTATION TO NASTRAN . 2. 1 OVERVIEW. . . . . 2.2 FUNCTIONAL ORGANIZATION 2.3 STANDARD NASTRAN APPLICATIONS .

2.3.1 Linear Static Analysis (Rigid Formats 1 and 2) 2.3.2 Nonlinear Static Analysis (Rigid Formats

4 J 5 and 6) . . . . . . . . . . . . . . . . . . . 2.3.3 Normal Modes Analysis (Rigid Format 3) 2.3.4 Complex Eigenvalue Analysis (Rigid Formats

. . . 7 and 10) . . . . . . . . . . . . . . . .

2.4

2.5

2.3.5 Dynamic Response Analysis (Rigid Formats 8, 9, 11 and 12) .

SPECIAL NASTRAN CAPABILITIES . . 2.4.1 Heat Transfer.Analysis 2.4.2 Hydroelastic Analysis. 2.4.3 Acoustic Cavity Analysis 2.4.4 Substructure Analysis ~ DIREC~ MATRIX ABSTRACTION PROGRAM (DMAP)

HOW TO USE THE GUIDE . 3.1 OVERVIEW. . 3.2 STANDARD NASTRAN DOCUMENTATION.

3.2.1 Theoretical Manual (TM) 3.2.2 User's Manual (UM) 3.2.3 Programmer's Manual (PM) 3.2.4 Demonstration Problem Manual (DP.)

3.3 DATA PREPARATION -. .' .' . 3.4 PROCESSING.

. . . . . . . .

. . . . . . . . . .

!I'

. . . .

4. BULK DATA DESCRIPTION 4.1 GENERAL DESCRIPTION 4.2 .PROBLEM DEFINITION 4.3 OPTIONS ~ FORMAT.

. . . 5. CASE CONTROL DESCRIPTION . . .

5.1 GENERAL DESCRIPTION 5.2 INPUT SEQUENCE AND FORMAT . . . 5.3 CASE CONTROL OPTIONS (UM 2.3) ..

5.3.1 Bulk Data Selection (UG 4.0) . 5.3.2 Output Selection (UM2.3.2) . 5.3.3 Subcase Specification (UM 2.3.3) .

5.4 EXAMPLES OF CASE CONTROL DECKS. . 5.4.1 Example 1 - Multiple Static Loadings 5.4.2 Example 2 - Linear Combination of Subcases 5.4.3 Example 3 - Statics Problem with Symmetry 5.4.4 Example 4 - Use of REPCASE in Static Analysis

y

page

iii

xi

xi

1-1

2-1 2-1 2-2 2-3 2-3

2-4 2-4

2-5

2-5 2-8 2-8 2-8 2-8 2-9 2-9

3-1 3-1 3-1 3-1 3-2 3-2 3-3 3-3 3-4

4-1 4-1 4-2 4-3

5-1 5-1 5-1 5-1 5-1 5-4 5-5 5-7 5-7 5-9

5-10 5-11

6.

7.

5.4.5 Example 5 - Use of M0DES and PUNCH Output Options 5-11 5.4.6 Example 6 - Use of S0RT2 Output Option 5-12 5.4.7 Example 7 - Use of XY0UT with Frequency and

Random Response . . . . . . . 5-13

EXECUTIVE CONTROL DESCRIPTION . . . . . . 6-1 6-1 6-1 6-3 6-3 6-5 6-5

6.1 6.2 6.3

6.4

GENERAL DESCRIPTION INPUT SEQUENCE AND FORMAT EXECUTIVE CONTROL OPTIONS

. . . . . . . . . 6.3.1 Use of Executive Control Cards EXAMPLES OF EXECUTIVE CONTROL DECKS . 6.4.1 Example 1 - Cold Start, No Checkpoint 6.4.2 Example 2 - Cold Start, Checkpoint,. Modified

System Parameters ....... 6.4.3 Example 3 - Restart, Checkpoint, Rigid Format

Switch' .'. . . . . . . . . . . .': . . . . . . . 6.4.4 Example 4 - Restart, No Checkpoint, Altered

Rigid Format . .

6-6

6-6

~LE INPUT ....

6-7

7-1 7-1 7-1

7.1 STANDARD APPLICATIONS OF NASTRAN . 7.1.1 Linear Static Analysis (Rigid Formats 1 and 2)

7.1.1.1 Rigid Format 1 ~ Shell with Symmetry Boundary Condi tions .. .

7.1.1.2 Input Cards - Unclamped Boundary and Symmetry Plots

7.1.1.3 Input Cards - Restart with Clamped

7-1

7-3

Boundary . . . . 77'6 7.1.1.4 Rigid Format 1 - Nonsymmetric Bending

of a Cylinder . . 7-8 7.1.1.5 Input Cards - Axisymmetric Model. 7-9 7.1.1.6 Rigid Format 2 - Free Body Ring 7-11 7.1.1.7 Input Cards - Inertial Relief 7~12

7.1.2 Non-Linear Static Analysis (Rigid Formats 4 , 5 and 6) '.' . . 7 -14 7.1.2.1 Rigid Format 4' - :pifferentia1 Stiffness

of a Beam . . . . . . . . . . . . . . 7-14 7.1.2.2 Input Cards - Large'Def1ection Analysis 7-14 7.1. 2.3 R:f gid ..... (n-me t 5 - Symmetric Buckling of

, a Cylinder ..... 7-18 7.1.2.4 Input Cards - With Structural Plotting. 7-20 7.1.2.5 Rigid Format 6 - Piecewise Linear.

Analysis with Beam Elements ~ . 7-24 . 7.1.2.6 Input Cards - Stress Dependent Materials 7-24

o~-\ 7.1.3 Normal Modes Analysis (Rigid Format 3) .'; "'. ~.. 7-28 7.1.3.1 Rigid Format 3 - Normal Modes Analysis

of a Plate ~ . 7-28 7.1.3.2 Input Cards -'With Structural Plotting. 7-29

7.1.4 Complex Eigenvalue Analysis (Rigid Formats 7 and -10) . . . 7-32 7.1.4.1 Rigid Format 7 - Damped Vibration of a

String . . . . . . . . . . . . 7.1.4.2 Input Cards - Scalar Elements ...

vi

7-32 7-33

7.2

7.3

7.1.4.3 Rigid Format 10 - Rocket Guidance and Control . . . . . . . . . . . . . .

7.1.4.4 Iqput Cards - DMAP Alter, Transfer Function and Resequencing

7.1.5 Dynamic Analyses (Rigid Formats 8, 9, 11 and 12) 7.1.5.1 Rigid Format 8 - Direct Frequency

Response of a Plate 7.1.5.2 Input Cards - Frequency Dependent'

Loading 7.1.5.3 Rigid Format 11 - Modal Frequency and

Random Response of a Beam 7.1.5.4 ,Input Card,s,- "Complex" Loading and

Random Response Output e. 7.1.5.5 Rigid Format 9 - Direct Transient

Analysis with Direct Matrix Input 7.1.5.6 Input Cards - Direct Matrix Input and

XYUT Plotting ~ . . 7.1.5.7 Rigid Format 12 - Modal Transient

Response of a Beam