HOW NASTRAN_IN_CAD PERFORM MULTIAXIAL FATIGUE ANALISYS?

[pizze]

Godmorning,

i have a question about the workflow that Nastran_in_cad use about multiaxial fatigue analisys. If i have a force or a torque with variations on time history, the software follow a workfolw like the pictures?

if have a torque like this picture, and  i insert the all number in the torque's table: ( torque from real measure)

1) The software perform in automatic a Rainflow countin and produce an stress range histogram?

2) Nastran use a plamgren-miner's rule's to perform a fatigue life estimations?

[John_Holtz · Accepted solution]

Hi @pizze 

The answer to question 1) is that is uses a rainflow method, so I assume it uses a stress histogram (like the next step in your workflow).

The answer to question 2) is yes, the analysis uses the Palmgren Miner.

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[pizze]

Thanks @John_Holtz  for the answer, and I thank you personally for your wonderful work about: Durability 101.