Techno Press
Techno Press

Structural Monitoring and Maintenance   Volume 5, Number 2, June 2018, pages 243-260
Numerical and experimental investigation for damage detection in FRP composite plates using support vector machine algorithm
Prashanth Shyamala, Subhajit Mondal and Sushanta Chakraborty

Abstract     [Full Text]
    Detection of damages in fibre reinforced plastic (FRP) composite structures is important from the safety and serviceability point of view. Usually, damage is realized as a local reduction of stiffness and if dynamic responses of the structure are sensitive enough to such changes in stiffness, then a well posed inverse problem can provide an efficient solution to the damage detection problem. Usually, such inverse problems are solved within the framework of pattern recognition. Support Vector Machine (SVM) Algorithm is one such methodology, which minimizes the weighted differences between the experimentally observed dynamic responses and those computed using the finite element model- by optimizing appropriately chosen parameters, such as stiffness. A damage detection strategy is hereby proposed using SVM which perform stepwise by first locating and then determining the severity of the damage. The SVM algorithm uses simulations of only a limited number of damage scenarios and trains the algorithm in such a way so as to detect damages at unknown locations by recognizing the pattern of changes in dynamic responses. A rectangular fiber reinforced plastic composite plate has been investigated both numerically and experimentally to observe the efficiency of the SVM algorithm for damage detection. Experimentally determined modal responses, such as natural frequencies and mode shapes are used as observable parameters. The results are encouraging since a high percentage of damage cases have been successfully determined using the proposed algorithm.
Key Words
    support vector machine; natural frequencies; mode shapes; fibre reinforced plastic (FRP) composites; finite element analysis; damage detection
Prashanth Shyamala and Sushanta Chakraborty: Department of Civil Engineering, Indian Institute of Technology Kharagpur, India
Subhajit Mondal: Department of Civil Engineering, National Institute of Technology Rourkela, India

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