×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Hertzian Contact Stresses - Please Help!!

Hertzian Contact Stresses - Please Help!!

Hertzian Contact Stresses - Please Help!!

(OP)
I'm trying to show my working for maximum shear stress for a sphere on a flat plate. The answer is 202.9 MPa.

Please can somebody show me the working out, I'm stuck at calculating the principal stresses and I cannot understand the z value, which is apparently 0.225mm.

When I input the values below into the equation for principal stress, I get 2.57x1010Pa, which gives me the wrong value when inputted into the shear stress eq.

I'm losing my mind over this!

Radius of sphere = 50mm, E = 200GPa, Poisson's Ratio = 0.3, Force = 300N, Pmax = 654.5MPa, z=0.225mm

RE: Hertzian Contact Stresses - Please Help!!

A diagram of the scenario you're trying to analyze will help tremendously.

RE: Hertzian Contact Stresses - Please Help!!

I have had good understanding on contact stresses from "Formulas for Stress, Strain, and Structural Matrices" by Walter D. Pilkey, John Wiley & Sons, chapter 9.

The Z parameter is distance from contact area to location of maximum shear stress.

The problem is thus



Go to the library or bookstore or internet ...



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! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close