Influence Of Internal Damage On The Vibration Behavior Of Metallic Beamstructures

Abstract

In structural engineering, detection of internal damage at the earliest possible stage of failure is one of the most significant factors for ensuring safety and reliability, and for limiting costs; this is critical to many practical applications. Several techniques to detect damage in engineering applications have been proposed in the literature; however, there is no consensus on which are the most effective. This study aimed to investigate the dynamic response of internal damage that occurs in an aluminum cantilever beam. This study describes a new technique to identify the internal damage within isotropic materials. Internal damage assessment of the beam was performed using a linear perturbation-free vibration study in ABAQUS (made by Finite Element software), to investigate the effectiveness of the damage detection technique. A damage detection scheme is evaluated for several scenarios varying by damage location and size, by relating fractional changes in modal energy to changes in natural frequency response parameters. The behavior of healthy and damaged beams are compared, and it is observed that the mode shape may be an effective method to detect damage.The intent of this work focuses on the best technique to identify the position of tiny damages within isotropic materials, and identifying the size of these damage points.