Mechanical investigation on interlaminar behaviour of inverse FML using acoustic emission and finite element method

Smolnicki, Michał; Duda, Szymon; Stabla, Paweł; Osiecki, Tomasz

doi:10.1016/j.compstruct.2022.115810

Cited by 12 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Inelastic deformations that occur in the material during the loading process generate elastic waves that are captured by AE sensors [18]. AE is widely used to investigate fracture and damage behaviour in composites [19]. It is without doubt a very useful technique that can register signals coming from different types of fracture, which is especially important in the investigation of composites.…”

Section: Introductionmentioning

confidence: 99%

Investigation of flexural behaviour of composite rebars for concrete reinforcement with experimental, numerical and machine learning approaches

Smolnicki,

Lesiuk,

Stabla

et al. 2023

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

Three different types (with glass, basalt and hybrid fibres) of composite rebars manufactured using the pultrusion process were loaded in four-point bending tests. All tests were carried out with acoustic emission sensors to better understand the mechanisms of damage. The data obtained were investigated using standard parameter analysis and also using unsupervised machine learning techniques called K-means. It was found that the best number of clusters is four or five. The numerical model using the finite-element method was calibrated on the basis of the experimental data. Further research will focus on numerical modelling of flexural behaviour of concrete beams reinforced with the presented composite rebars. The presented paper focuses on the characterization of the mechanical properties of composite rebars using a micromechanical approach, as well as analysis of progression damage processes appearing under flexural loading, using different perspectives provided by techniques such as acoustic emission analysis with machine learning-based clustering and numerical simulations. The presented research confirms that the proposed experimental–numerical approach can be applied in order to describe the flexural behaviour of Fibre Reinforcement Polymer (FRP) rods, which is relevant for investigating more complex cases of FRP concrete structures. This article is part of the theme issue 'Physics-informed machine learning and its structural integrity applications (Part 1)'.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation of flexural behaviour of composite rebars for concrete reinforcement with experimental, numerical and machine learning approaches

Smolnicki,

Lesiuk,

Stabla

et al. 2023

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…Fracture toughness tests could provide the resistance of the material to cracks, propagation in material, and sharp notches on the surface. The fracture mechanism of composite parts may occur in an interlaminar, intralaminar, or translaminar form [ 48 , 49 , 50 , 51 , 52 ]. Interlaminar failure develops between the layers of the structures, causing their separation.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Flame Retardant—Aluminum Trihydroxide on Mixed Mode I/II Fracture Toughness of Epoxy Resin

et al. 2022

View full text Add to dashboard Cite

Fire resistance is a major issue concerning composite materials for safe operation in many industrial sectors. The design process needs to meet safety requirements for buildings and vehicles, where the use of composites has increased. There are several solutions to increasing the flame resistance of polymeric materials, based on either chemical modification or physical additions to the material’s composition. Generally, the used flame retardants affect mechanical properties either in a positive or negative way. The presented research shows the influence of the mixed-mode behavior of epoxy resin. Fracture toughness tests on epoxy resin samples were carried out, to investigate the changes resulting from different inorganic filler contents of aluminum trihydroxide (ATH). Three-point bending and asymmetric four-point bending tests, with different loading modes, were performed, to check the fracture behavior in a complex state of loading. The results showed that the fracture toughness of mode I and mode II was reduced by over 50%, compared to neat resin. The experimental outcomes were compared with theoretical predictions, demonstrating that the crack initiation angle for higher values of KI/KII factor had a reasonable correlation with the MTS prediction. On the other hand, for small values of the factor KI/KII, the results of the crack initiation angle had significant divergences. Additionally, based on scanning electron microscopy images, the fracturing of the samples was presented.

show abstract

Combined experimental–numerical mode I fracture characterization of the pultruded composite bars

Smolnicki

Duda

Zielonka

et al. 2023

Archiv.Civ.Mech.Eng

View full text Add to dashboard Cite

In this paper, pultruded GFRP bars are investigated to determine their fracture properties. The double cantilever beam test (DCB) is used to assess fracture behavior under mode I loading conditions. However, due to the presence of the R-curve effect (variable fracture energy dependent on the length of the crack), it is necessary to introduce a nonstandard approach to determine fracture properties. The mixed experimental–numerical approach is proposed to deal with this issue. Numerical simulations were carried out in Simulia Abaqus, and with Python scripting it was possible to generate models and obtain R-curve for the material. The numerical model built based on the experimental results has very good agreement with it (force–displacement and delamination length–time characteristics) which allows the use of the mentioned model in the analysis of more complex structures. Acoustic emission analysis was introduced as an auxiliary technique. The delamination obtained from both the numerical model and the experiment complies with the registered acoustic emission events. The proposed method can be used in preparing a material model for other composite materials, which display the presence of the R-curve effect.

show abstract

Mechanical investigation on interlaminar behaviour of inverse FML using acoustic emission and finite element method

Cited by 12 publications

References 29 publications

Investigation of flexural behaviour of composite rebars for concrete reinforcement with experimental, numerical and machine learning approaches

Investigation of flexural behaviour of composite rebars for concrete reinforcement with experimental, numerical and machine learning approaches

The Effect of Flame Retardant—Aluminum Trihydroxide on Mixed Mode I/II Fracture Toughness of Epoxy Resin

Combined experimental–numerical mode I fracture characterization of the pultruded composite bars

Contact Info

Product

Resources

About