3D AutoDesk Inventor Tutorial

© February 12, 2016 Dr. Lynn Fuller

3D AutoDesk Inventor Tutorial

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ROCHESTER INSTITUTE OF TECHNOLOGY MICROELECTRONIC ENGINEERING

Revision Date: 2-12-2016 3D-AutoDesk-Tutorial.ppt

3D Auto Desk Inventor Tutorial

Dr. Lynn Fuller

Webpage: http://people.rit.edu/lffeee Electrical and Microelectronic Engineering

Rochester Institute of Technology 82 Lomb Memorial Drive Rochester, NY 14623-5604

http://people.rit.edu/~lffeee



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OUTLINE

Introduction

Inventor 3D Software

Simple Cantilever Example

2D Sketch

3D Part

Stress Analysis

Displacement Analysis

Output

References



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INTRODUCTION - 3D DESIGN SOFTWARE

There are a few different kinds of 3D design software available for use by RIT students. The preferred software for compatibility with the 3D printers is Inventor. This software can be downloaded for free by students from the internet. SolidWorks is another software that can be found on RIT computers in Mechanical Engineering. Both of these programs use similar vocabulary and functions, so after learning one software, it is not difficult to transition to another. The basic operations are either identical or very similar with only minor nuances between programs.

Above graphics from software websites.



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USING 3D DESIGN SOFTWARE

The basic premise behind the design software is that one first creates a two-dimensional drawing and then converts it into a three-dimensional shape using one of four main functions. Two-dimensional sketches are fairly straightforward. There are functions for drawing circles, rectangles and free form shapes.

The image at right shows a

preliminary sketch as a

circle is drawn and the

designer specifies the radius.



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USING 3D DESIGN SOFTWARE

There are four main functions for converting the two-dimensional sketch into a three-dimensional object:

-Extrude: bring the profile up perpendicular (ex. circle -> cylinder, square -> cube/rectangle

-Sweep: draw a path and keep the profile normal to the path – can draw any path that the profile takes (unlike extrude which has to be a straight, perpendicular line) (we used to make spring)

-Loft: like sweep but possible to gradually change the geometry of the profile (ex. square into circle)

- Revolve: rotate the profile around an arbitrary axis that you set

Sweep circle along

curving line to produce

shape at right.

Above image shows

extrusion of circle to

form a cylinder.



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AUTODESK INVENTOR - CREAT A NEW PART

Select New Part



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SET UP UNITS AND GRID

Select Tools

>Document Settings

>Units

>Set to micron

>Set to Degree

>Set to Kilogram

>Sketch

>Set x and y snap to 1micron

>Grid Display

Minor=1

Major=10

Apply



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SOME TIPS

The middle mouse button is used to zoom in or out

View > Zoom All, etc.

This icon lets you to select different views

RIGHT, FRONT, TOP, etc. (click on text)

or ROTATE axis (click on corner and drag)

more



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CREATE A 2D SKETCH



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EXTRUDE 2D SKETCH TO MAKE 3D SHAPE



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EXTRUDE 2D SKETCH TO MAKE 3D SHAPE



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SET UP MATERIAL UNITS



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MATERIAL PROPERTIES FOR SILICON

Density 2.3290 g/cm3

Thermal Expansion 2.6um/(m-K)

Thermal Conductivity 149 W/(m-K)

Young’s Modulus 160 GPa

Shear Modulus 70 GPa

Poisson Ratio 0.28

Yield Strength 12GPa

Tensile Strength 14GPa



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HAND CALCULATIONS



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FINITE ELEMENT ANALYSIS

Select Environments, then stress analysis and create simulation

Mesh View



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SET CONSTRAINTS AND LOADS

Point Load

Force = 19uN

Fixed Edge

Constraint



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OTHER SIMULATION RESULTS



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1st PRINCIPAL STRESS

40.5 MPa from simulation

37.5 MPa from hand calculations



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Y DISPLACEMENT

0.677 um from simulation

0.658 um from hand calculations



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VON MESIS STRESS



Page 21

Richard von Mises



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OTHER STRUCTURES OF INTEREST

Diaphragms

Thermal Actuators

Complex Cantilever

Chevron

Thermal Actuator

Fixed Points in Red

Hot Arm

Cold Arm



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OTHER STRUCTURES OF INTEREST

Springs Fixed Points in Red

Multilayer Different Materials

Simple Bridge



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THERMAL STRESS AND DISPLACEMENT

Still working on it



Page 25

ANIMATIONS

Movies

Still working on it



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FILE FORMATS – SAVING, 3D PRINTING

There are two different types of files that are important when it comes to saving your design. Save the design as a Parts file (.prt) to allow you to continue editing the design. In order to print the file, save it as an STL file (.stl). You may have to export the file as an .stl if that option does not appear under the save menu. This type of file can be uploaded to the Maker software so the design can be printed. Before clicking save once you have selected .stl, click on settings and in the top left hand corner of the box that pops up; make sure that the units are the units that you designed the part with so that it has the correct dimensions when printed.

Autodesk Inventor Parts (*.stl)

PrototypeA.stl

Screen capture

at right shows

exporting a

file as .stl and

below shows

saving a file to

.stl format.



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REFERENCES

1. Auto Desk website help.

2. Dr. Fuller’s Tutorial on 3D printing. See webpage



Page 28

HOMEWORK – AUTODESK INVENTOR TUTORIAL

1. Duplicate the drawing and evaluation of a simple cantilever with

different dimensions.

2. Draw and evaluate one of the structures on page 30.

Documents

3D AutoDesk Inventor Tutorial