turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

- Navigation
- Simcenter
- Forums
- Blogs
- Knowledge Bases

- Siemens PLM Community
- Simcenter
- 3D Simulation - Simcenter 3D Forum
- NX Durability results

Options

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

10-04-2016 03:10 PM

I did a stress analysis on a ball bearing model , got perfect results . Then i did a durablity analysis on it and chose the proper stress models and got strength safety factor and margin of safety values as the results for a million cycles. How to interpret the result? What does these values indicate? I have to basically approximate the life cycle of the product, how many revolutions will it go in the given load , before failing. How will the SSF and margin of safety help me calculate that?

Solved! Go to Solution.

Labels:

3 REPLIES

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

10-05-2016 07:20 AM

The SSF tells you how close your max stress is to the ultimate or yield strength. If it is above yield, then you should use a strain life approach to estimate fatigue life. Otehrwise, a stress life approach would be suitable.

If you know how many cycles your structure will experience, then enter them as you did and the fatigue margin of safety expresses the capacity of the structure to withstand that number of cycles: If it is below 0, it cannot.

You can also compute fatigue life, using one of the methods described above (srtess or strain life).

Philippe Tremblay

phillippe.tremblay.ext@siemens.com

www.mayahtt.com

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

10-07-2016 02:04 AM

Thank you for the answer.

But, i am having problem with the data input as i cannot find any information on the fatigue strength coeffiecient and cyclic parameters which are required for durability analysis. I have to do the analysis on ABS plastic.

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

10-07-2016 10:24 AM

S-N data for this type of material is not easily available.

I would suggest you look at the polymer chapter of either one of these ASM books:

http://www.asminternational.org/home/-/journal_content/56/10192/05361G/PUBLICATION/

In the past, we've adapted curves found in the such books using the ultimate strengths of the materials.

Philippe Tremblay

phillippe.tremblay.ext@siemens.com

www.mayahtt.com

Follow Siemens PLM Software

© 2018 Siemens Product Lifecycle Management Software Inc