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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › Modal Results not Responding to Changing Pre-Stress › Reply To: Modal Results not Responding to Changing Pre-Stress

April 22, 2024 at 11:38 pm
Michael Fusaro
Subscriber

Thanks for your reply Peter.

An additional question I have is, what might cause my 3-sigma equivalent stress from a random vibration to be much lower than the equivalent stress from the static structural pre-stress analysis?

For example, I have a part at the end of my beam that exhibits high stresses under static structural loading (~300 MPa)

When performing random vibration with the above pre-stressed static structural, the 3-sigma equivalent stress only reaches about ~40 MPa.

I understand Random Vibration is a statistical result, but I cannot understand why the stress would be significantly lower than the static case. I just want to make sure I am interpreting these results correctly.

 

Thanks in advance, 

MichaelÂ