Designing for fatigue with random vibration excitation

An experimental program was conducted to determine the correlation between fatigue life values obtained by sinusoidal fatigue tests and those obtained from narrow band random fatigue tests. The fatigue tests were performed on two commonly used aluminum alloys, 2024-T3 and 6061-T6. Specimens made from these two materials were subjected to either constant amplitude sinusoidal or narrow band random fatigue loadings. Standard tensile tests were made on these two materials in order to obtain the true stress-strain diagrams to failure.