Experimental validation of modal strain energies based damage identification method for a composite sandwich beam

A vibration-based damage identification method, based on changes in modal strain energies before and after occurrence of damage, is presented for a composite sandwich beam. Experiments were performed to obtain the natural frequencies and mode shapes for validation of the presented method. The observed changes in modal strain energies were used for the prediction of existence and location of damage in a composite sandwich beam. Subsequently, these changes were also used to predict damage extents in the two stages. In the first stage, the proposed method is used to approximate the damage extents in the face and core. These were updated to obtain more accurate values of damage extent at the second stage by using the model updating theory. Experimental and numerical results were presented to demonstrate and verify the effectiveness of this method for several single and multiple damage cases. These damage cases also include interactive damage modes. Results indicate that the proposed method is capable of identifying the location and extent of damage in the faces and core of a composite sandwich beam.

[1]  R. A. Shenoi,et al.  Vibration-based damage identification in beam-like composite laminates by using artificial neural networks , 2003 .

[2]  S. Law,et al.  Structural damage localization from modal strain energy change , 1998 .

[3]  Hwai Chung Wu,et al.  Failure analysis of FRP sandwich bus panels by finite element method , 2003 .

[4]  Qiuhai Lu,et al.  MULTIPLE DAMAGE LOCATION WITH FLEXIBILITY CURVATURE AND RELATIVE FREQUENCY CHANGE FOR BEAM STRUCTURES , 2002 .

[5]  Jaycee H. Chung,et al.  DETECTING STRUCTURAL DAMAGE USING FREQUENCY RESPONSE FUNCTIONS , 1998 .

[6]  Colin P. Ratcliffe,et al.  Vibration Technique for Locating Delamination in a Composite Beam , 1998 .

[7]  Sandor M. Veres,et al.  Damage detection in a sandwich composite beam using wavelet transforms , 2003, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[8]  Norris Stubbs,et al.  Damage identification in beam-type structures: frequency-based method vs mode-shape-based method , 2003 .

[9]  Ramesh Talreja,et al.  Damage mechanics of composite materials , 1994 .

[10]  Christian Cremona,et al.  Assessment of vibration-based damage identification techniques , 2006 .

[11]  R. A. Shenoi,et al.  Quantification and localisation of damage in beam-like structures by using artificial neural networks with experimental validation , 2003 .

[12]  J. Whitney,et al.  Effective Elastic Constants of Bidirectional Laminates Containing Transverse Ply Cracks , 2000 .

[13]  Jacques Renard,et al.  Damage in composites : from physical mechanisms to modelling , 2006 .

[14]  Arun Kumar Pandey,et al.  Damage detection from changes in curvature mode shapes , 1991 .

[15]  Keith Worden,et al.  DAMAGE DETECTION USING OUTLIER ANALYSIS , 2000 .

[16]  Gerard C. Pardoen,et al.  Effect of Delamination on the Natural Frequencies of Composite Laminates , 1989 .

[17]  Hassan Mahfuz,et al.  Fatigue crack growth and life prediction of foam core sandwich composites under flexural loading , 2003 .

[18]  Leonard Meirovitch,et al.  Elements Of Vibration Analysis , 1986 .

[19]  Guido De Roeck,et al.  Damage assessment by FE model updating using damage functions , 2002 .

[20]  J. E. Grady,et al.  Free vibrations of delaminated beams , 1991 .

[21]  Daniel J. Inman,et al.  An experimentally validated damage detection theory in smart structures , 1996 .

[22]  Robert D. Adams,et al.  A Vibration Technique for Non-Destructively Assessing the Integrity of Structures: , 1978 .

[23]  O. S. Salawu.  Detection of structural damage through changes in frequency: a review , 1997 .

[24]  Charles R. Farrar,et al.  Application of the strain energy damage detection method to plate-like structures , 1999 .

[25]  Charles R. Farrar,et al.  A summary review of vibration-based damage identification methods , 1998 .

[26]  T. Chondros,et al.  Identification of cracks in welded joints of complex structures , 1980 .

[27]  Bor-Tsuen Wang,et al.  Damage detection of surface cracks in composite laminates using modal analysis and strain energy method , 2006 .

[28]  David C. Zimmerman,et al.  Damage Detection Using Expanded Dynamic Residuals , 2001 .