engineering fundamentals Discussion Forum
Directory | Career | News | Standards | Industrial | SpecSearch®
Home Membership Magazines Forum Search Member Calculators

Materials

Design

Processes

Units

Formulas

Math
List Recent Topics | Start a New Topic
 

<< Previous Message No. 10467 Next >>
Author: neil moran
Time: 01/30/03 14:08 PST
This is a reply to message no. 10466 by ddelaiar
Reply | Original Message | New Topic | List Topics | List Messages on This Topic
Current Topic:
Press Fit Pressure
Hi Dan,

Assuming that you can (or have already) calculated the pressure between the head and the tube - there is a section on cylinders under pressure in 'Roark's Formulas for Stress and Strain', look under autofrettage.

This pressure is constant around the contact diameter, so take the area of engagement between the head and the tube ie. contact diameter x Pi x contact length and multiply it by the pressure already calculated, to give the total force. Now multiply by your coefficient of friction to give the friction force and finally, multiply by the contact radius to give you the torque required.

It seems fairly straightforward, or have I missed the point here?

Do bear in mind that COF's are a bit hit and miss, and also it will take more torque at breakaway (to get it started moving), than it will to keep it moving.

Regards,
Neil Moran

[ List Replies to This Message Only ]

Home  Membership  About Us  Privacy  Disclaimer  Contact  Advertise

Copyright © 2017 eFunda, Inc.