×
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

Method of Slices Analysis - Tension Crack

Method of Slices Analysis - Tension Crack

Method of Slices Analysis - Tension Crack

(OP)
I'm interested in your thoughts on how to locate the position and depth of a tension crack in a method of slices/limiting equilibrium computer analysis. The various programs offer lots of latitude in deciding how/where a tension crack is modeled. I've come across a few schools of thought on how to do this and hope to learn a few more:
1. Change the tension crack depth and location until the minimum Fs is found
2. Place a tension crack to eliminate negative (tensile) interslice normal forces. Get forces from free body diagrams or force output tables.
3. Set the tension crack depth equal to some percentage of the failure height. ie Cousin's charts limit crack depth to half the slope height.

I've used #2 over the years, but was told recently that this is not the right way to model a tension crack as the interslice forces in the LE analysis are not realistic since the analysis method forces each slice to have the same Fs. I get this, but also disagree with the logic to a certain extent.

Thoughts??

RE: Method of Slices Analysis - Tension Crack

I've always used method 2. However, as you note at the end of your question this method has limits.

In reality I believe that these limits are small and that this is the best practial method. The resulting variation in FS is generally small, much smaller than our degree of certainty where the inputs are concerned.

Mike Lambert

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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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