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  • 1
    Online Resource
    Online Resource
    Residual Force Method for damage identification in a laminated composite plate with different boundary conditions
    Gruppo Italiano Frattura ; 2021
    In:  Frattura ed Integrità Strutturale Vol. 16, No. 59 ( 2021-12-22), p. 35-48
    Details
    In: Frattura ed Integrità Strutturale, Gruppo Italiano Frattura, Vol. 16, No. 59 ( 2021-12-22), p. 35-48
    Abstract: The strongest point about damage identification based on the dynamic measurements, is the ability perform structural health evaluation globally. Researchers in the last few years payed more attention to damage indicators based on modal analysis using either frequencies, mode shapes, or Frequency Response Functions (FRFs). This paper presents a new application of damage identification in a cross-ply (0°/90°/0°) laminated composite plate based on Force Residual Method (FRM) damage indicator. Considering single and multiple damages with different damage levels. As well as investigating the SSSS and CCCC boundary conditions effect on the estimation accuracy. Moreover, a white Gaussian noise is introduced to test the challenge the technique. The results show that the suggested FRM indicator provides accurate results under different boundary conditions. Favouring the SSSS boundary condition than the CCCC for 3% noise.
    Type of Medium: Online Resource
    ISSN: 1971-8993
    URL: Article
    DOI: 10.3221/IGF-ESIS.59.03
    Language: English
    Publisher: Gruppo Italiano Frattura
    Publication Date: 2021
    detail.hit.zdb_id: 2418303-9
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  • 2
    Online Resource
    Online Resource
    Damage identification in steel plate using FRF and inverse analysis
    Gruppo Italiano Frattura ; 2021
    In:  Frattura ed Integrità Strutturale Vol. 15, No. 58 ( 2021-09-25), p. 416-433
    Details
    In: Frattura ed Integrità Strutturale, Gruppo Italiano Frattura, Vol. 15, No. 58 ( 2021-09-25), p. 416-433
    Abstract: Metaheuristic algorithms have known vast development in recent years. And their applicability in engineering projects is constantly growing; however, their deferent exploration and exploitation techniques cause the engineering problems to favor some algorithms over others. This paper studies damage identification in steel plates using Frequency Response Function (FRF) damage indicator to detect and localize the healthy and damaged structure. The study is formulated as an inverse analysis, investigating the performance of three new metaheuristic algorithms of Wild Horse Optimizer (WHO), Harris Hawks Optimization (HHO), and Arithmetic Optimization Algorithm (AOA).  The objective function is based on measured and calculated FRF damage indicators. The results showed that the case of four damages with different damage severity levels presented a good challenge where the HWO algorithm was shown to have the best performance.  Both in convergence speed and CPU time.
    Type of Medium: Online Resource
    ISSN: 1971-8993
    URL: Article
    DOI: 10.3221/IGF-ESIS.58.30
    Language: English
    Publisher: Gruppo Italiano Frattura
    Publication Date: 2021
    detail.hit.zdb_id: 2418303-9
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  • 3
    Online Resource
    Online Resource
    Combination of Intermittent Search Strategy and an Improve Particle Swarm Optimization algorithm (IPSO) for damage detection of steel frame
    Gruppo Italiano Frattura ; 2021
    In:  Frattura ed Integrità Strutturale Vol. 16, No. 59 ( 2021-12-22), p. 141-152
    Details
    In: Frattura ed Integrità Strutturale, Gruppo Italiano Frattura, Vol. 16, No. 59 ( 2021-12-22), p. 141-152
    Abstract: Modality and intermittent search strategy in combination with an Improve Particle Swarm Optimization algorithm (IPSO) to detect damage structure via using vibration analysis basic principle of a decline stiffness matrix a structure is presented in the study as a new technique. Unlike an optimization problem using a simplistic algorithm application, the combination leads to promising results. Interestingly, the PSO algorithm solves the optimal problem around the location determined previously. In contrast, Eagle Strategy (ES) is the charging of locating the position in intermittent space for the PSO algorithm to search locally. ES is easy to deal with its problem via drastic support of Levy flight. As known, the PSO algorithm has a fast search speed, yet the accuracy of the PSO algorithm is not as good as expected in many problems. Meanwhile, the combination is powerful to solve two problems: 1) avoiding local optimization, and 2) obtaining more accurate results. The paper compares the results obtained from the PSO algorithm with the combination of IPSO and ES for some problems and between experiment and FEM to demonstrate its effectiveness. Natural frequencies are used in the objective function to solve this optimization problem. The results show that the combination of IPSO and ES is quite effective.
    Type of Medium: Online Resource
    ISSN: 1971-8993
    URL: Article
    DOI: 10.3221/IGF-ESIS.59.11
    Language: English
    Publisher: Gruppo Italiano Frattura
    Publication Date: 2021
    detail.hit.zdb_id: 2418303-9
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  • 4
    Online Resource
    Online Resource
    Crack prediction in beam-like structure using ANN based on frequency analysis
    Gruppo Italiano Frattura ; 2021
    In:  Frattura ed Integrità Strutturale Vol. 16, No. 59 ( 2021-12-22), p. 18-34
    Details
    In: Frattura ed Integrità Strutturale, Gruppo Italiano Frattura, Vol. 16, No. 59 ( 2021-12-22), p. 18-34
    Abstract: The dynamic experimental and numerical analysis of cracked beams has been studied with the aim of quantifying the influence of depth crack on the dynamic response of steel beams. Artificial Neural Method ANN has been used where a numerical simulation was improved in Matlab. A finite element model has also been developed by using the Ansys software, and the obtained results were compared with exact crack length. The study takes into account different hidden layer values in order to determine the sensitivity of the predicted crack depth.  The results show that the response of the beam (frequencies) is strongly related to the crack depth which significantly affects the beam behavior, especially when the crack is very deep where the ANN allows us to identify the crack in lower computational time. Based on the provided results, we can detect that the effect of hidden layer size can affect the results.  
    Type of Medium: Online Resource
    ISSN: 1971-8993
    URL: Article
    DOI: 10.3221/IGF-ESIS.59.02
    Language: English
    Publisher: Gruppo Italiano Frattura
    Publication Date: 2021
    detail.hit.zdb_id: 2418303-9
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  • 5
    Online Resource
    Online Resource
    RC beams damaged by cracking and strengthened with NSM CFRP/GFRP rods
    Gruppo Italiano Frattura ; 2021
    In:  Frattura ed Integrità Strutturale Vol. 15, No. 58 ( 2021-09-25), p. 386-401
    Details
    In: Frattura ed Integrità Strutturale, Gruppo Italiano Frattura, Vol. 15, No. 58 ( 2021-09-25), p. 386-401
    Abstract: The near surface mounted (NSM) method of inserting fiber reinforced polymer (FRP) elements (rods or lamina) into notches has been shown to be a good way for restoring reinforced concrete (RC) elements. The knowledge about the use of Glass-FRP rod following the NSM to reinforce RC beams is limited. This paper deals with the analysis of static and dynamic behaviour of RC beams with and without strengthening. The response of RC beams was assessed at different concrete’s damage level by non-destructive vibration tests. First, a couple of beams have been analysed: one RC beam subjected to bending and under vibration tests; another one beam, damaged by bending and strengthened with NSM Carbon-FRP rods tested again under vibration. Further, one RC beam damage was analysed under bending and vibration tests without strengthening; successively, the beam model with NSM GFRP rod has been tested following the same loading path. Below experimental results are shown and commented; in particular, changes in frequency values are related to the evolution of damage level affected RC beams with NSM CFRP and GFRP rods.
    Type of Medium: Online Resource
    ISSN: 1971-8993
    URL: Article
    DOI: 10.3221/IGF-ESIS.58.28
    Language: English
    Publisher: Gruppo Italiano Frattura
    Publication Date: 2021
    detail.hit.zdb_id: 2418303-9
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  • 6
    Online Resource
    Online Resource
    Sensitivity analysis of the GTN damage parameters at different temperature for dynamic fracture propagation in X70 pipeline steel using neural network
    Gruppo Italiano Frattura ; 2021
    In:  Frattura ed Integrità Strutturale Vol. 15, No. 58 ( 2021-09-25), p. 442-452
    Details
    In: Frattura ed Integrità Strutturale, Gruppo Italiano Frattura, Vol. 15, No. 58 ( 2021-09-25), p. 442-452
    Abstract: In this paper, the initial and maximum load was studied using the Finite Element Modeling (FEM) analysis during impact testing (CVN) of pipeline X70 steel. The Gurson-Tvergaard-Needleman (GTN) constitutive model has been used to simulate the growth of voids during deformation of pipeline steel at different temperatures. FEM simulations results used to study the sensitivity of the initial and maximum load with GTN parameters values proposed and the variation of temperatures. Finally, the applied artificial neural network (ANN) is used to predict the initial and maximum load for a given set of damage parameters X70 steel at different temperatures, based on the results obtained, the neural network is able to provide a satisfactory approximation of the load initiation and load maximum in impact testing of X70 Steel.            
    Type of Medium: Online Resource
    ISSN: 1971-8993
    URL: Article
    DOI: 10.3221/IGF-ESIS.58.32
    Language: English
    Publisher: Gruppo Italiano Frattura
    Publication Date: 2021
    detail.hit.zdb_id: 2418303-9
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