×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

(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

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

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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!