Vibration Fatigue Analysis of a Simply Supported Cracked Beam Subjected to a Typical Load

In order to realize the accurate prediction of vibration fatigue life beam in service, a loose coupling analysis method is proposed carry out with an initial crack. modal analysis, crack segment replaced torsion spring, and damping loss factor introduced by complex modulus elasticity; for simply supported beam, inherent characteristic equation cracked derived. interaction between crack’s growth considered, conduct dynamic response simultaneously. Results indicate that relative location depth determine parameters, external excitation frequency are important factors beam.