1 7 th International Congress on Computational Mechanics and Simulation Damage Detection in Composite Plate Using Particle Swarm Optimization Suryamani Behera a , Tikendra Arya b , Subhajit Mondal * Department of Civil Engineering, NIT Rourkela, Odisha, India a PhD scholar, Email: suryamani1014@gmail.com b M.Tech scholar, Email: tikendraa@gmail.com * Assistant Professor, Communicating author, Email: mondalsubhajit@nitrkl.ac.in Abstract. Vibration-based damage detection strategies have been attracted considerable attention because of their easy and direct execution of vibration data.In this present research, damage detection in the composite plate is conductedusing Particle Swarm Optimization (PSO) algorithm. In this regard, the finite element model is considered, and the damage is assumed as a rigidity loss in some of the elements. The damage severities are estimated by minimizing the modal parameter based objective function. The results show that PSO is an effective methodology in detecting damages in the composite structure. Keywords: Damage Identification; Particle Swarm Optimization (PSO); Composite Structure; Frequency; Mode Shapes 1 Introduction Fiber Reinforced Plastic (FRP) most commonly used in a weight-sensitive aerospace structure. However, composite structures are now days being rapidly deployed in civil infrastructure applications (e.g. bridge deck, girder, etc.) where cost and durability are more important. China made an all-composite Miyun highway bridge in 1982, the- reafter; there are several examples of FRP composite applied in civil infrastructure. FRP can be made using different manufacturing processes such as hand lay-up, fila- ment winding, resin transfer moulding or pultrusion. Moreover, due to the different fabrication of FRP can lead to a wide variation in the finally achieved material prop- erties and also manufacturing defects. In the last decade, the vibration-based damage detection strategies have been attracted considerable attention because of their easy and direct execution of vibration da- ta.These techniques depend on the way that dynamic properties such as frequencies and mode shapes are easily identified with the stiffness of the structure.