Damage identification in composite laminates using a hybrid method with wavelet transform and finite element model updating

Abstract

Delamination is a common defect in composite plates that may cause significant losses in commercial applications. In this study, a hybrid damage detection method was introduced, which raised both the damage identification sensitivity level and detected quantitative damage parameters. The primary damage location was pinpointed by the wavelet transform, and the damage parameters, including location, depth, and intensity, were then isolated by the model updating process. The wavelet transform was obtained according to the signal’s nature, which leads to improvement in the wavelet transform’s operation. Then, the lifting scheme algorithm process was performed to increase the wavelet efficiency in damage detection. In addition, a proper signal, based on strain energy, was used for damage detection by the wavelet transform. Finally, the genetic algorithm method was employed in the proposed model updating method to identify the damage parameters through employing a novel error function. The selected error function was based on strain energy, having the best operation among previously identified modal criteria. Consequently, the accuracy of identifying the damage parameters was improved upon utilizing the proposed method, particularly in the presence of noise. In addition, the solution performed faster than the previously available updating methods which utilized only the genetic algorithm-based on mode shapes and natural frequencies for detecting the damage.

Identification of mechanical and damage parameters of composite laminates based on a CPAM method

“…More detail about modal experiment procedure of these plates can be followed in Ashory et al. 11,12,14 and Ghasemi-Ghalebahman et al. 17 As can be seen from Figure 4, these plates were hanged by two strings.…”

“…The frequency's upper limit for this system is 25 kHz and for omitting the aliasing noise, an internal low pass filter is utilized. More detail about modal experiment procedure of these plates can be followed in Ashory et al 11,12,14 and Ghasemi-Ghalebahman et al 17 As can be seen from Figure 4, these plates were hanged by two strings. Because natural frequencies obtained experimentally, are independent of position and rigidities of these strings, boundary conditions of these plates are considered completely free.…”

“…They also proposed a hybrid damage detection method in their second study which increased the sensitivity level of both damage identification and detected quantitative damage parameters. 12 Because of complex equations of damage detection problems, some smart optimization methods (evolutionary analysis (EA), simulated annealing (SA), genetic algorithm (GA), particle swarm optimization (PSO) and ant colony optimization (ACO) algorithms) are now widely used. 13 Ashory et al 14 investigated a damage identification technique in their third study using a finite element model updating based on GA.…”

Temperature-dependent thermo-elastic parameter identification for composites using thermal modal data

“…20 Researchers have paid much attention in recent years to the field of structural parameter identification using experimental modal data. [21][22][23][24][25][26] Experimental frequency response function combined with modal data were used to identify the damping matrix. 27,28 The response surface model as a surrogate model for identifying the elastic parameter can be found in previous studies.…”

Experimental investigation of damage detection in plate-like structure using combined energetic approaches

“…Zhang et al 8 proposed a new damage detection method for structures like plate based on the curvature method using the measurement of frequency which improves the precision. The finite element method (FEM) [9][10][11][12] was also used for SHM and defect detection using the structure dynamics or static responses. Ratnam et al 13 have combined the finite element approach and lamb wave propagation parameter for predicting natural frequencies and mode shapes of cantilever plates in undamaged and damaged conditions.…”