FEA is nowadays a standard tool to calculate structures both statically and dynamically. Today the majority of accidents during normal operating conditions are caused by material fatigue.
Fatigue means that the material during normal operating condition is gradually weakened by repeated loads eventually leading to failure under normal loading.
Design against fatigue is in many ways more complex than pure static analysis, which is further complicated if you need to consider welds as well.
At Symetri we have a long experience of performing fatigue life calculations and can help you in designing great products.