×
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

Scaling BH curves for non-fully-dense powdered metals

Scaling BH curves for non-fully-dense powdered metals

Scaling BH curves for non-fully-dense powdered metals

(OP)
I'm designing several small parts in 410 or 416 stainless, to be manufactured in powdered metal.  It is common to specify the density of a part to be 80% to 85% of theoretical (solid) density.  Higher densities, essentially to 100%, are achievable, but all these are much higher cost:  initial mold, mold maintenance, and a much larger press.  Keeping the density down is a good thing.  

Interestingly, the drop in yield strength is proportional to the drop in density.  What I'd like to know is this:  if I want to specify a part to be 85% dense, can I reasonably multiply the BH curve by 0.85 and use it in an FEA?  

Thanks very much!
Dave

RE: Scaling BH curves for non-fully-dense powdered metals

Given that you are only dealing with 85% density, it is a reasonable approximation.  However, I would recommend only scaling the B values of the curve, not the H.  Since B represents the response of the material to an applied magnetic field (H), it is the one that'll be decreasing.

RE: Scaling BH curves for non-fully-dense powdered metals

(OP)
MagMike,

Thank you very much!  I will use 0.85 as an approximation, multiplying only the magnetic flux density values, not the magnetic field strength values.  (Sorry for the clumsy wording in my original post.)

This is great!  It's wonderful when something that seems like it ought to be true turns out to be true!

Thank you again,
Dave

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