Available online at www.sciencedirect.com ScienceDirect Materials Today: Proceedings 5 (2018) 19565–19575 www.materialstoday.com/proceedings 2214-7853 © 2018 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of Materials Processing and characterization. ICMPC_2018 Damage Detection In Structural Beams Using Model Strain Energy Method And Wavelet Transform Approach Lanka Ramesh* a , Putti Srinivasa Rao b a Mechanical Engineering Department, Gudlavalleru Engineering College, Sheshadri Rao Knowledge Village, Gudlavalleru- 521356 Krishna District, Andhra Pradesh ,INDIA b Mechanical Engineering Department, Andhra University, Visakha Patnam-530003, Andhra Pradesh, INDIA Abstract Damage identification method of surface cracks in beams using strain energy method and its spatial wavelet transform is investigated in this paper. Experimental modal analysis (EMA) is conducted on a aluminium cantilever beam to obtain the mode shapes before and after damage under a fixed-free boundary condition by Laser Doppler Vibrometer (LDV). A small perturbation is created by using Electro Discharge Machine (EDM) and simulated crack by separation of nodes at the crack location in beams. The purpose of the study is to present damage index method and spatial wavelet transform approaches to identify the location and quantification of surface crack in beam structure. A finite element analysis (FEA) is also performed to access this approaches and illustrate a attainable process for the experimental work. First, the displacement mode shapes obtained from the intact and damaged beams which are used to obtain strain energy ratio of the beam before and after damage and then these spatially distributed signals are analyzed by wavelet transformation. Good correlation between FEA and EMA results is obtained. Both methods damage index (DI) and wavelet transform (WT) successfully identify the location of surface crack in the aluminium beam. it is also demonstrated that the location and quantification of single and multi cracks can be detected by this methods. © 2018 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of Materials Processing and characterization. Keywords: damage detection, Experimental modal analysis,Strain energy, wavelet transform,. 1. Introduction Vibration based Structural Health Monitoring (SHM) became one of the fundamental approaches in structural damage detection from past 30 years. It is based totally on the fact that methods allowing to existence of damage detection and its location at earlier stage become an intensive investigation thought the mechanical. civil and aerospace engineering domain from the last two decades. The existence of damage in structure introduces local flexibility that would have an effect on dynamic characteristics of whole structure. * Corresponding author. E-mail address: lramesh007@yahoo.com