Fatigue Life Scatter Factor' s Computing Formulas of Airplane Structures in Countries

The results of fatigue life test of airplane structures are scattered, so the value of fatigue life we get in test is divided by life scatter factor to get the use life. Fatigue Life scatter factor is a measurement of reliability to prevent plane from fatigue failure. The life scatter factors of countries are different. One of the main reasons is that their formulas are different. The paper chooses three representative computing formulas, discusses their computational principles, then analyzes and compares them.