experimental spectral damage prediction of a linear elastic system using acceleration response

the fatigue-related behavior of a linear elastic system (les) can be efficiently identified using acceleration response if the frequency response function between the acceleration input and the stress response (frfas) can be predetermined. in this paper, the spectral damage of an les is predicted using energy isoclines, whose function consists of both frfas and the fatigue material properties of the les. the accuracy of the proposed method was verified through a uniaxial vibration test using flexible specimens and a comparison of the acceleration-based and strain-based spectral damage at the location of interest.