×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Deviations in modulus of elasticity / poisson's ratio

Deviations in modulus of elasticity / poisson's ratio

Deviations in modulus of elasticity / poisson's ratio

(OP)
LS,

When applying a certain (stainless) steel, the modulus of elasticity, shear modulus and poisson's ratio can be found.
Can someone tell how accurate these figures are and what deviations can be expected. Are they e.g. within 5%? Should we have the materials tested every time to be accurate.

Thanks,
DYV

RE: Deviations in modulus of elasticity / poisson's ratio

Elastic constants are relatively unaffected by the common things done by metallurgy.  Using steel as an example, Young's Modulus usually is between 200 GPa and 210 GPa - a 5 % difference.  The one common variable that does change elastic constants is preferred orientation (the result of heavy cold deformation), but the variations are usually around 10 %.


Regards,

Cory

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.

RE: Deviations in modulus of elasticity / poisson's ratio

The above constants will be affected by service temperature.

RE: Deviations in modulus of elasticity / poisson's ratio

(OP)
Thank you for your replies.

The reason for my question: we do an optical measurement of strain of steel shafts (material is mainly C45E). This is an 0.5% accurate measurement, but when calculating back to forces the uncertainty is Youngs modulus (and for torsion also Poisson's ratio).

Can variations up to 10% be expected within 1 type of material? The heat treatment will always be identical (normalized), and afterwards only a few millimeters of material will be turned off.

Thanks,
DYV

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources