Fatigue life reduction of GFRP composites due to delamination associated with the introduction of functional discontinuities

Shahkhosravi, Naeim Akbari; Yousefi, Jalal; Najafabadi, Mehdi Ahmadi; Burvill, Colin; Minak, Giangiacomo

doi:10.1016/j.compositesb.2019.01.005

Cited by 19 publications

(4 citation statements)

References 17 publications

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“…Glass fiber–reinforced polymer (GFRP) composites, as an advanced composite material, has an excellent strength, corrosion resistance, fatigue resistance, and molding processability. 1 It is widely used in industries such as the construction, aerospace, automotive, shipbuilding, and wind power generation industries. 2 , 3 , 4 Consequently, a considerable number of studies 5 , 6 , 7 have researched the improvement of GFRP material properties.…”

Section: Introductionmentioning

confidence: 99%

Three-point bending damage detection of GFRP composites doped with graphene oxide by acoustic emission technology

Shu,

Liao,

Zhou

et al. 2023

iScience

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Section: Introductionmentioning

confidence: 99%

Three-point bending damage detection of GFRP composites doped with graphene oxide by acoustic emission technology

Shu,

Liao,

Zhou

et al. 2023

iScience

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“…The effects of ply cracking and local delamination on the in-plane axial properties of symmetric laminates have been extensively investigated experimentally (Berglund et al, 1992;Carraro et al, 2019;Kahla et al, 2020;Ogihara and Takeda, 1995;Shahkhosravi et al, 2019;Wang and Karihaloo, 1997). However, experimental approaches involve time-consuming and expensive processes.…”

Section: Introductionmentioning

confidence: 99%

A computational study about the effects of ply cracking and delamination on the stiffness reduction of damaged lamina and laminate

Ahmadi

Hajikazemi

Paepegem

2021

International Journal of Damage Mechanics

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Accurate prediction of stiffness degradation in the damaged plies (laminae) is a fundamental requirement for developing damage models for composite materials. In this study, a mesoscale analysis is proposed to predict all the effective thermo-elastic constants of damaged plies containing ply cracks and delaminations based on a numerical homogenization method. To do so, the in-plane and out-of-plane loading conditions are imposed on the three-dimensional representative volume elements (RVEs) using the periodic boundary conditions (PBCs). Considering the stress/strain fields obtained from the numerical simulations, the effective behavior of the damaged plies is evaluated. Moreover, the effects of various damage configurations, material properties, orientations of adjacent plies and ply thicknesses are studied to address the dependency of the effective elastic constants to those parameters. Numerical results reveal that the ply cracking and delaminations significantly reduce the in-plane and out-of-plane properties ([Formula: see text], [Formula: see text],[Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]) of the damaged plies. Furthermore, to demonstrate the accuracy and capability of the developed homogenization method, the homogenized properties of the damaged plies are used in the intact laminates where the stiffness of such laminates are compared with direct FE simulation and available experimental data of the laminates containing ply cracks and local delamination.

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“…Morscher and Maxwell 23 used electrical resistance, acoustic emission, and surface optical techniques to identify the fiber breakage and matrix cracking, during fatigue testing of SiC-based composites. Shahkhosravi et al 24 obtained the effect of drilling parameters on the delamination during monotonic and cyclic testing of glass fibers reinforced composites. By acoustic emission and image processing techniques, they showed that drilling parameters had no significant effects on the material strength.…”

Section: Introductionmentioning

confidence: 99%

Cumulative acoustic emission energy for damage detection in composites reinforced by carbon fibers within low-cycle fatigue regime at various displacement amplitudes and rates

Azadi

Alizadeh

Farrokhabadi

2021

Polymers and Polymer Composites

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In the present article, acoustic emission signals were utilized to predict the damage in polymer matrix composites, reinforced by carbon fibers, in the low-cycle fatigue regime. Displacement-controlled fatigue tests were performed on open-hole samples, under different conditions, at various displacement amplitudes of 5.5, 6.0, 6.5 and 7.0 mm and also under various displacement rates of 25, 50, 100 and 200 mm/min. After acquiring acoustic emission signals during cycles, two characteristic parameters were used, including the energy and the cumulative energy. Obtained results implied that the energy parameter of acoustic emission signals could be used only for the macroscopic damage, occurring at more than 65% of normalized fatigue cycles under different test conditions. However, the cumulative energy could properly predict both microscopic and macroscopic defects, at least two failure types, including matrix cracking at first cycles and the fiber breakage at last cycles. Besides, scanning electron microscopy images proved initially such claims under all loading conditions.

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Fatigue life reduction of GFRP composites due to delamination associated with the introduction of functional discontinuities

Cited by 19 publications

References 17 publications

Three-point bending damage detection of GFRP composites doped with graphene oxide by acoustic emission technology

Three-point bending damage detection of GFRP composites doped with graphene oxide by acoustic emission technology

A computational study about the effects of ply cracking and delamination on the stiffness reduction of damaged lamina and laminate

Cumulative acoustic emission energy for damage detection in composites reinforced by carbon fibers within low-cycle fatigue regime at various displacement amplitudes and rates

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