Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

Failure Index...I'm confused

Status
Not open for further replies.

sughew

Mechanical
Apr 30, 2005
20
0
0
GB
Hi,

I am confused with the failure index results. I understand how the numbers arise - Von Mises/ Tensile strength, for example. Furthermore, When I compute the max VMises/tensile strength of the material on my calculator, the results match. Great!

My confusion is this: VMises/tensile Strength = Factor of safety. If the result is equal to or greater than 1, then the design is assumed 'safe'. Mechanica states that if the Failure Index is equal to or greater than 1, then the material/design has failed.

What is the difference? Is my part safe or not?

In addition, the Failure Index is given as #*E6,for example. What are the units for. safety factor is dimensionless....
James
 
Replies continue below

Recommended for you

Status
Not open for further replies.
Back
Top