Linear Static Analysis Using Msc Nastran And Patran Pdf

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Linear Static, Normal Modes, and Buckling Analysis Using MSC.Nastran and MSC.Patran

Market mscsoftware. Contact mscsoftware. Disclaimer MSC Software Corporation reserves the right to make changes in specifications and other information contained in this document without prior notice. The concepts, methods, and examples presented in this text are for illustrative and educational purposes only, and are not intended to be exhaustive or to apply to any particular engineering problem or design. MSC Software Corporation assumes no liability or responsibility to any person or company for direct or indirect damages resulting from the use of any information contained herein.

Printed in U. All Rights Reserved. This notice shall be marked on any reproduction of this documentation, in whole or in part. Any reproduction or distribution of this document, in whole or in part, without the prior written consent of MSC Software Corporation is prohibited. This software may contain certain third-party software that is protected by copyright and licensed from MSC Software suppliers. All rights reserved. George Karypis and Vipin Kumar.

All other trademarks are the property of their respective owners. The Support Center provides technical articles, frequently asked questions and documentation from a single location. All important features and concepts in this book are illustrated with examples. As you read this guide, it is highly recommended that you run the example problems and make variations of these problems. When learning a new MSC Nastran feature, engineers all too often generate a large problem using several hundred or several thousand degrees of freedom as a test case.

This practice has become the norm in recent years with the advent of graphics preprocessors and automatic meshing. Rarely is such a large model necessary to learn a new feature; in most cases, it just adds unnecessary complexity. For this reason most of the examples in this book are small--generally less than degrees of freedom.

It is recommended you copy any example problem to your local directory, so you can see the files created and you dont inadvertently create files in the delivery directory. What was large in the s is tiny today. While the discussions in this guide of large problems, cpu, storage usage and restart capabilities may imply thousands of degrees of freedom, the reality of MSC Nastran today is s of million dof problems are possible.

The discussions are still valid, just the scale has changed. To keep this users guide to a reasonable size, complete descriptions of all the MSC Nastran Bulk Data entries and Case Control commands have not been included. A brief description of the input format is given for entries and commands when it is helpful to understand the material.

This guide contains many highlighted links in blue to other MSC Nastran documents and all the documents were delivered together as a collection. If you keep the collection together the links between documents will work. Two suggestions when working with links are 1 alt returns you back in the window your mouse is in and 2 you can open the other linked to document in a new window from an Adobe Reader by choosing Edit Preferences Documents Open cross-document links in the same window; then you would uncheck the.

Scope The main topic of this users guide is linear static analysis. The goal is to provide material relevant to this subject in such a manner that this book can be used both as a learning tool and as a reference text. Introduction Ch. The following. Material Properties and Composites Ch. R-Type Constraint Elements Ch. Modeling Guidelines Ch. Model Verification Ch. Inertia Relief Ch. This can be very useful for modeling aircraft in flight or satellites in space.

Matrix Operations Ch. Linear Buckling Ch. It might be argued that buckling does not fall within the realm of linear static analysis. However, the assumption is that those engineers who perform static analyses are also the ones most likely to perform buckling analyses. Accordingly, a full chapter is devoted to buckling.

The latter part of this guide focuses on modeling techniques and model verification. Restarts Ch. These topics are generally not needed for the small example problems used throughout this guide. However, these chapters are very useful when running larger production jobs. Cyclic Symmetry Ch.

Contact in Linear Static Analysis Ch. Adaptive Meshing Ch. Grid Point Weight Generator Ch. Sample Output Listings App. A contains examples of most printed output formats in Linear Static. Video Examples App. Using the Finite Element Method Before discussing the specifics of the finite element method using MSC Nastran, it is useful to examine how you might use the finite element method to solve an engineering problem.

The discussion in this section is quite general and is not meant to show you the specifics of generating and running a finite element computer model.

Rather, the purpose of this discussion is give you some insight into how and why you would use the finite element method. The finite element method is used in a wide variety of disciplines and engineering applications. One of the most common applications of the method is to solve structural analysis problems. Traditionally, structural analysis applications are divided into two areas-static and dynamic analyses.

Performing structural analysis using the finite element analysis is no exception. It is not unusual to find individuals who spend the majority of their time performing static finite element analysis and little or no time performing dynamic analysis. Likewise, it is common to find individuals who spend the majority of their time performing dynamic analysis. This guide deals exclusively with static analysis, whereas the MSC Nastran Dynamic Analysis Users Guide is available for those who are interested in dynamic analysis.

However, you should find the material in this guide worthwhile regardless of your specialty area. When performing static analysis using the finite element method, the structure is represented as a collection of discrete elements. Think of these elements as building blocks from which you can construct a model of the actual structure. Using the properties of these individual building blocks the elements , the stiffness of the whole structure is approximated.

The loads on the structure are represented as forces acting on the elements or on the boundary of the elements. To use the finite element method effectively, you must apply your engineering knowledge to the structure being analyzed. Next you must decide how much detail to put in your model, i.

More detail in the model results in a more accurate solution but it costs more in terms of computer resources. The goal is to create an accurate, yet cost-effective model. The better your understanding of the structure, the applied loads, and the MSC Nastran solution process, the more effective you will be in finding solutions to your problems.

Suppose you have to design a circular tube as shown in Figure and you are considering using MSC Nastran.

The tube has an outer diameter of 20 mm and a wall thickness of 0. The tube is attached at both ends to a thick bracket which is fixed rigidly to the wall.

Both the tube and the bracket are made of aluminum. The loading consists of a transverse force of N acting on a ring 10 mm in width located in the center of the tube. Before starting a computer model, ask the following questions: 1. What are the load paths for this structure? Knowing the load path for the structure provides insight regarding what part of the structure needs to be modeled in detail.

Furthermore, knowing how the loads are transmitted to the structure helps you to understand and verify the results. What is our design criteria?

You may be concerned that the applied load causes local yielding of the material, or yielding may be a secondary concern and your main concern may be deflection. Another concern may be that of the tube buckling. The answer to these questions dictates how much detail is needed in your model. If yielding is of concern, where are the higher stresses expected to occur, and what failure criteria should be used? Is the structure displacement considered small?

If the displacement is not small compared to the dimensions of the tube, is it necessary to perform a nonlinear analysis? Planning ahead as to what additional analyses may be necessary can reduce the time necessary to convert the input file to a nonlinear analysis if needed.

How can the results of the finite element analysis be verified? In other words, what independent checks can be made to ensure that the answers are reasonable? Returning to the tube structure, assume that the primary design criteria are to have an adequate marginof-safety and a critical buckling load that is at least three times the applied load. The load for this structure consists of a force applied to the stiff ring at the center.

The stiff ring prevents the tube from crushing locally where the force is applied. From the geometry of the tube, you expect the displacement and stress distribution to be similar to that of a classical fixed-fixed beam with a center load. A good first step in any analysis is to estimate the output quantities that you are trying to determine.

LESSON 11 Linear Static Analysis of a Solid Lug - SCC

Software tion assumes no liability or responsibility to any person or company for direct or indirect damages resulting use of any information contained herein. Software Corporation. Printed in U. All Rights Reserved. Any reproduction or ion of this document, in whole or in part, without the prior written consent of MSC.

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Conceptual design and linear static analysis of nose landing gear Abstract: Landing is one of the most maneuvers occurring in aircraft. Landing gear is considered as a nonlinear structure due to its complicated behavior. In this paper we did linear static analysis of nose landing gear of a subsonic civil transport aircraft. During landing period large amount of impact forces are transferred into nose gear and main landing gear.

Nastran Basics

Software tion assumes no liability or responsibility to any person or company for direct or indirect damages resulting use of any information contained herein. Software Corporation. Printed in U. All Rights Reserved. Any reproduction or ion of this document, in whole or in part, without the prior written consent of MSC.

The annual review of NASA 's structural dynamics research program revealed that the research centers were separately developing structural analysis software that was specific to their own needs. The review recommended that a single generic software program should be used instead. The committee determined that no existing software could meet their requirements. They suggested establishing a cooperative project to develop this software and created a specification that outlined the capabilities for the software. For example, the automotive industry uses the program to design front suspension systems and steering linkages.

In this video, we cover the basics of Nastran. Hardware On Demand. The BDF writer writes a small field formatted file, but makes full use of the 8-character Nastran field.

Nastran: Basic Tutorial for Students

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 Алло. - Сьюзан, это Дэвид. Я тебя разбудил.

Бринкерхофф пожал плечами и подошел к окну. - Электроснабжение уже наверняка восстановили.  - Он открыл жалюзи. - Все еще темно? - спросила Мидж.

Все повернулись к экрану.

 Я понимаю, - сказал.  - Извините за беспокойство. Повернувшись, он направился через фойе к выходу, где находилось вишневое бюро, которое привлекло его внимание, когда он входил. На нем располагался щедрый набор фирменных открыток отеля, почтовая бумага, конверты и ручки.

По выражению его лица было ясно: то, что он собирается сказать, не понравится директору и остальным. - Этот червь, - начал он, - не обычный переродившийся цикл. Это избирательный цикл. Иными словами, это червь со своими пристрастиями.


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Please bear in mind that all of the MSC training materials available on this site are copyrighted and so you may not distribute them, either electronically or in hardcopy form, without express written consent from MSC.

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