Detecting laminate damage using embedded electrically active plies – An analytical approach

Micheal, Amany; Bahei–El–Din, Yehia A.

doi:10.1016/j.compstruct.2017.02.076

Cited by 2 publications

(3 citation statements)

References 35 publications

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“…All matrices are function of elastic moduli, fiber volume fraction of the laminas and the laminate layup. A closed form of these matrices can be found in Micheal and Bahei-El-Din (2017).…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties and Damage Analysis of Laminates with Hybrid Fiber Volume Fraction

Micheal¹

2019

J. Eng. Appl. Sci.

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This study is concerned with modelling the mechanical behavior and damage of glass fiber composite laminates that exhibit hybrid fiber volume fraction. The Transformation Field analysis (TFA) is implemented in formulation while the composite is modeled using Mori-Tanaka averaging model. The formulation is verified versus an experimental program conducted at the Center for Advanced Materials (CAM) in the British University in Egypt (BUE). The studied laminates are with different lay ups and subjected to uniaxial bending and tension. The investigated lay ups are (0E) glass fiber symmetric laminate with thickness 37.0 mm and consists of 48 plies and a (0/±45E) symmetric laminate comprised of 12 layers of (0/±45E) glass fiber textile resulting in 36 plies with total thickness 10.7 mm. The fiber volume fraction (FVF) is 62% for both lay ups. The hybridization in fiber volume fraction is implemented by assigning low FVF of 40% for some core plies with variable depths. The core depths studied for the (0E) laminate are t/4, t/2 and 3t/4 where t is half the thickness of the laminate while the core depths for the (0/±45E) layup are t/3 and 2t/3. A comparison according to different criteria between the results of the above-mentioned lay ups and the results of the same laminate when all plies have the same volume fraction of 62% is conducted. The comparison criteria include longitudinal and flexural stiffness, the tensile strength and bending moment at the onset of failure together with ultimate bending moment the laminate can sustain. For bending case, the results show that for both the (0E) and (0/±45E) laminates, minor reduction in the mechanical properties in both the undamaged and damaged state takes place. The reduction ranges from 0-12% for all recorded variables. For the axial tension, the loss in mechanical properties is more rigorous. For the off-axis layup, laminate may lose 23% of its stiffness for large core depths. The effect is more pronounced for the load capacity where the laminate may lose up to 30% of its strength according to the depth of the low FVF core.

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“…All matrices are function of elastic moduli, fiber volume fraction of the laminas and the laminate layup. A closed form of these matrices can be found in Micheal and Bahei-El-Din (2017).…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties and Damage Analysis of Laminates with Hybrid Fiber Volume Fraction

Micheal¹

2019

J. Eng. Appl. Sci.

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“…Bahei-El-Din and Micheal 29 and Micheal and Bahei-El-Din 30 studied the damage fibrous laminates with some/all electrically active plies. In Bahei-El-Din and Micheal, 31 the analysis scale escalated to laminated structures. Although the latter research modeled electroactive composite structures with a complex geometry, it stopped short of modeling damage initiation and assessment.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the TFA scheme developed for electrically active composite structures developed by Bahei-El-Din and Micheal 31 is extended to model damage. This is a three-tier analysis; structural, macroscopic, and microscopic, which interact together and fields information flows between the three levels in both directions.…”

Section: Introductionmentioning

confidence: 99%

Implementation of multiscale mechanisms in finite element analysis of active composite structures

Micheal

Bahei–El–Din

2022

Journal of Composite Materials

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Interrogation of composite structures for inherent damage is investigated implementing three-tier analysis scheme. The analysis starts at the structure level where a general-purpose Finite Element code ABAQUS is employed to obtain the stress field in the second level of analysis that is the composite laminate. A special material routine is prepared to propagate the local fields to the individual plies and hence to the third level of analysis which is the microstructure modelling of the composite. Through the third level of analysis, interface damage between fiber and matrix is checked implementing a certain failure criteria. The interaction between the different length scales; that are, structure, macro, and micro scales, is implemented using the non-mechanical strains caused by damage. Embedment of electrically active fibers in the laminate serves as a tool to interrogate the structure for inherent damage through the electric displacement generated due to the electro-mechanical coupling. To verify the developed multi-scale model, a comparison with the experimental results of a tube problem under combined internal pressure and axial load is presented. The results show good agreement in both the undamaged and damaged state. As an application, a plate with a hole under biaxial load is solved. The output includes not only the structure global behavior during damage but also detailed information about the location of damage within the structure, the plies that exhibit damage, type of damage and the fiber/matrix debonded length. Comparison between the electric displacement of the active fibers in the undamaged and damaged states is presented as well.

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Detecting laminate damage using embedded electrically active plies – An analytical approach

Cited by 2 publications

References 35 publications

Mechanical Properties and Damage Analysis of Laminates with Hybrid Fiber Volume Fraction

Mechanical Properties and Damage Analysis of Laminates with Hybrid Fiber Volume Fraction

Implementation of multiscale mechanisms in finite element analysis of active composite structures

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