XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX''"> Problem Description
This example is an extension of the previous example where the simple constant amplitude loading is replaced with a more complex randomly varying time signal.
Invoke Pre & Post or MSC Patran by typing the following symbols at the system prompt or from a DOS window:
fXX or fatX or fatigue where XX is the version number
p3 or patran
If you have not already, open the same database that you created in the previous example working in the same directory from the File | Open menu. The name of the database should be keyhole.
Objective
• To predict the life of the keyhole subject to a varying load signal.
• To understand how to normalize the FE stresses.
• To introduce the concept to rainflow cycle counting.
• To introduce the concept of damage summation.
• To investigate the effect of mean stress.
• To investigate the probabilistic nature of fatigue.
Note: | The geometry and materials information are identical to that of the previous exercise. |
