Finite element modeling of composite plates with internal delamination

Alnefaie, Khaled A.

doi:10.1016/j.compstruct.2009.01.004

Cited by 77 publications

(58 citation statements)

References 25 publications

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“…Nitekim bu çalışmada, kompozit levha için tespit edilen çok az olan doğal frekans düşüşleri Alnefaie ve Qiaoa vd. yaptıkları araştırmalarla örtüştüğü görülmüştür [15,23]. Qiao vd., delaminasyon hasarının doğal frekanslara olan etkilerini incelemek için, sağlıklı ve genişliğin %33'ü delaminasyon barındıran kompozit levhaları deneysel ve nümerik olarak incelemişlerdir [23].…”

Section: Sonuçlar Ve Tartişmalar (Results and Discussion)unclassified

“…Sonunda, insanların bu uyarılardan lineer olmayan değişimleri algılama ve bunlardan da hasarı belirleyebilme düzeylerini test etmişlerdir. Alnefaie, sonlu elemanlar yöntemini kullanarak kompozit malzemelerdeki delaminasyon hasarını modellemiş ve delaminasyon hasarının doğal frekansı nasıl etkilediğini araştırmıştır [15]. …”

Section: Gi̇ri̇ş (Introduction)unclassified

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Tabakali Kompozi̇t Bi̇r Ki̇ri̇ş Ve Levhada Hasar Tespi̇ti̇ni̇n Model Tabanli Yapi Sağliği İzleme Tekni̇kleri̇yle Beli̇rlenmesi̇

Pekedis

Yıldız

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Section: Sonuçlar Ve Tartişmalar (Results and Discussion)unclassified

Section: Gi̇ri̇ş (Introduction)unclassified

Tabakali Kompozi̇t Bi̇r Ki̇ri̇ş Ve Levhada Hasar Tespi̇ti̇ni̇n Model Tabanli Yapi Sağliği İzleme Tekni̇kleri̇yle Beli̇rlenmesi̇

Pekedis

Yıldız

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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“…The free decay time domain signal obtained after the hammer impact was simulated using transient vibration analysis. The number of elements used for each lamina was 936 elements and the criteria employed to select the number of elements was convergence [10]. The element type used was Shell 181 and it was chosen among several elements on the basis of having high accuracy and minimum computations time.…”

Section: Numerical Modellingmentioning

confidence: 99%

The effect of nylon nanofibers on the dynamic behaviour and the delamination resistance of GFRP composites

Garcia¹,

Trendafilova²,

Zucchelli

et al. 2018

MATEC Web Conf.

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Abstract. Vibrations are responsible for a considerable number of accidents in aircrafts, bridges and other civil engineering structures. Therefore, there is a need to reduce the vibrations on structures made of composite materials. Delamination is a particularly dangerous failure mode for composite materials because delaminated composites can lose up to 60% of their strength and stiffness and still remain unchanged. One of the methods to suppress vibrations and preventing delamination is to incorporate nanofibers into the composite laminates. The aim of the present work is to investigate how nylon nanofibers affect the dynamic behaviour and delamination resistance of glass fibre reinforced polymer (GFRP) composites. Experiments and numerical simulations using finite element modelling (FEM) analysis are used to estimate the natural frequencies, the damping ratio and inter-laminar strength in GFRP composites with and without nylon nanofibers. It is found that the natural frequencies of the nylon nano-modified composites do not change significantly as compared to the traditional composites. However, nano-modified composites demonstrated a considerable increase in damping ratio and inter-laminar shear strength due to the incorporation of nylon nanofibers. This work contributes to the knowledge about the mechanical and dynamic properties of glass fibre reinforced polymer (GFRP) composites with nylon nanofibers.

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“…Vibration/modal analysis of delaminated composite plates-based on numerical simulations-has been extensively studied in the past [67,68]. The dynamics of thin laminated composites can be effectively modelled using two-dimensional (2D) finite elements and the classical lamination theory (CLT) [69].…”

Section: Finite Element Model Of the Delaminated Platementioning

confidence: 99%

Triple correlation for detection of damage-related nonlinearities in composite structures

et al. 2015

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Nonlinear effects in vibration responses are investigated for the undamaged composite plate and the composite plate with a delamination. The analysis is focused on higher harmonic generation in vibration responses for various excitation amplitude levels. This effect is investigated using the triple correlation technique. The dynamics of composite plate was modelled using two-dimensional finite elements and the classical lamination theory. The doubled-node approach was used to model delamination area. Mode shapes and natural frequencies were estimated based on numerical models. Next, the delamination divergence analysis was used to obtain relative displacements for delaminated plies. Experimental modal analysis test was carried out to verify the numerical models. The two strongest vibration modes as well as two vibration modes with the smallest and largest motion level of delaminated plies were selected for nonlinear vibration test. The Fisher criterion was employed to verify The results show that the method can be used not only to reveal nonlinearities, but also to reliably detect impact damage in composites. These results are confirmed using the statistical analysis.

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Finite element modeling of composite plates with internal delamination

Cited by 77 publications

References 25 publications

Tabakali Kompozi̇t Bi̇r Ki̇ri̇ş Ve Levhada Hasar Tespi̇ti̇ni̇n Model Tabanli Yapi Sağliği İzleme Tekni̇kleri̇yle Beli̇rlenmesi̇

Tabakali Kompozi̇t Bi̇r Ki̇ri̇ş Ve Levhada Hasar Tespi̇ti̇ni̇n Model Tabanli Yapi Sağliği İzleme Tekni̇kleri̇yle Beli̇rlenmesi̇

The effect of nylon nanofibers on the dynamic behaviour and the delamination resistance of GFRP composites

Triple correlation for detection of damage-related nonlinearities in composite structures

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