Damage assessment based on sensitivity of modal parameter in plated structure

Damage assessment of plated structures based on modal parameter is of interest to many researchers and a large number of studies have been conducted in this field. In the lifetime of a structure, performance and stability will degrade due to many factors. This process usually comes with the development of corrosion and loss of thickness in the affected region. This paper describes a study of the vibration characteristics of square and rectangular plate structures undergoing corrosion and loss of section problem. A finite element analysis utilizing Abaqus code has been adapted to model this problem. First, the baseline model of undamaged and healthy plate was modelled to determine its natural frequency and mode shape. The baseline model results were then used to make comparisons with a damage model. The mode shape for each damage scenario was extracted and further evaluated to study the sensitivity of the mode shape toward the presence of damage. The size of damage, position, and depth of loss of thickness vary for different damage cases. Significant reduction of natural frequency and localization of mode shape in the damaged region can be observed in the presence of severe damage in plated structures