Module 9: Definition and examples of real world torsional engineering applications

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Aus dem Kurs von Georgia Institute of Technology

Mechanics of Materials II: Thin-Walled Pressure Vessels and Torsion

295 Bewertungen

Georgia Institute of Technology

Mechanics of Materials II: Thin-Walled Pressure Vessels and Torsion

295 Bewertungen

This course explores the analysis and design of thin-walled pressure vessels and engineering structures subjected to torsion. ------------------------------------------------ The copyright of all content and materials in this course are owned by either the Georgia Tech Research Corporation or Dr. Wayne Whiteman. By participating in the course or using the content or materials, whether in whole or in part, you agree that you may download and use any content and/or material in this course for your own personal, non-commercial use only in a manner consistent with a student of any academic course. Any other use of the content and materials, including use by other academic universities or entities, is prohibited without express written permission of the Georgia Tech Research Corporation. Interested parties may contact Dr. Wayne Whiteman directly for information regarding the procedure to obtain a non-exclusive license.

Aus der Unterrichtseinheit

Elastic Torsion of Straight Cylindrical Shafts

In this section, we will learn how to analyze and design for elastic torsion of straight cylindrical shafts.

Module 9: Definition and examples of real world torsional engineering applications3:50

Module 10: Torsional shearing strain5:37

Module 11: Torsional shearing stress4:42

Module 12: Elastic torsion formula5:56

Module 13: Polar moment of inertia3:57

Module 14: Angle of twist2:32

Treffen Sie die Kursleiter

Dr. Wayne Whiteman, PE
Senior Academic Professional
Woodruff School of Mechanical Engineering

[MUSIC]

Welcome back to mechanics of materials part two.

This is module nine, and we've been moving right along in the course.

And so we finished the section on thin-walled pressure vessels, and

today we start the topic of torsion.

So the learning outcomes for

today are to define the torsional loading of engineering structures and

to give some examples of real world torsional engineering applications.

So torsional loading of engineering structures is when we twist the object due

to an applied torque for moment and the units for torsion are Newton-meters or

foot-pounds.

And so, here's a member being twisted with a torque at both ends,

and here is the original line on the member, and when we torque it,

it turns, and I've exaggerated this turning.

You can see this on my demo here.

I have this engineering member and if I apply a torque or

a moment, you can see how it twists and turns.

And so, this is a material that has a very low stiffness and so

we can see the deformations very easily.

This is a pool noodle.

Okay, so let's look at some

examples of when we would use torsional loading of engineering structures.

One would be torsional bar suspension systems.

And here's a race car and you can see here as the suspension system goes up and

down, this is a member here that would be loaded with torsion, the same down here.

As this is twisted,

there would be a torsional load placed on this engineering member.

Another example, this is a track vehicle.

Again, it's a suspension system.

As this roller wheel goes up and down then it's going to produce a torque

on this member here that goes back into the body of the track vehicle.

Another example would be turbines.

Here is an example of a turbine.

Through the middle of this turbine there's a shaft and

that shaft is exposed to torsional loading.

Also wind turbines, there's shafts up here on the wind turbine, which as the wind

turbine operates are subjected to torsional loading.

And finally, you even see examples of torsion in,

for instance, bone spiral fractures in biomechanics.

And so, as an example, again, if I have my arm here and this bone,

if it gets twisted and breaks, you get a fracture,

and that's a bone spiral fracture due to a torsional loading.

And then one final real world example is this driveshaft.

This is, again, a driveshaft from a mini-baja vehicle, which is a project

that we do each year in the mechanical engineering school here at Georgia Tech.

The students have a team that put together a mini-baja or

kind of a dune buggy vehicle, and this is the driveshaft that was taken out of

one of those members and it's subjected to torsional loading.

And so those are all good examples, of when you, real world examples,

when you would see torsional loading of engineering structures.

And we'll go on and do the theory as we start the next module.

[SOUND]

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