Damage monitoring methods for fiber-reinforced polymer joints: A review

Li, Wencai; Palardy, Geneviève

doi:10.1016/j.compstruct.2022.116043

Cited by 40 publications

(14 citation statements)

References 180 publications

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“…This is particularly true for the EMI method, which evaluates the dynamic response of a structure of interest (part of an electromechanical system) to continuous harmonic excitation, i.e., it is a vibration-based method. Consequently, the evaluation of potential damages is extremely complicated, due to reflections from more distant structural regions, e.g., boundaries and correlated disturbances [ 12 ]. Classical statistical damage metrics typically do not allow reliable damage identification [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Sandwich Face Layer Debonding Detection and Size Estimation by Machine-Learning-Based Evaluation of Electromechanical Impedance Measurements

Kralovec

Lehner

Kirchmayr

et al. 2023

Sensors

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The present research proposes a two-step physics- and machine-learning(ML)-based electromechanical impedance (EMI) measurement data evaluation approach for sandwich face layer debonding detection and size estimation in structural health monitoring (SHM) applications. As a case example, a circular aluminum sandwich panel with idealized face layer debonding was used. Both the sensor and debonding were located at the center of the sandwich. Synthetic EMI spectra were generated by a finite-element(FE)-based parameter study, and were used for feature engineering and ML model training and development. Calibration of the real-world EMI measurement data was shown to overcome the FE model simplifications, enabling their evaluation by the found synthetic data-based features and models. The data preprocessing and ML models were validated by unseen real-world EMI measurement data collected in a laboratory environment. The best detection and size estimation performances were found for a One-Class Support Vector Machine and a K-Nearest Neighbor model, respectively, which clearly showed reliable identification of relevant debonding sizes. Furthermore, the approach was shown to be robust against unknown artificial disturbances, and outperformed a previous method for debonding size estimation. The data and code used in this study are provided in their entirety, to enhance comprehensibility, and to encourage future research.

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Section: Introductionmentioning

confidence: 99%

Sandwich Face Layer Debonding Detection and Size Estimation by Machine-Learning-Based Evaluation of Electromechanical Impedance Measurements

Kralovec

Lehner

Kirchmayr

et al. 2023

Sensors

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“…Durability of FRP composites exposed to elevated temperature and fire, ultraviolet radiation, creep and fatigue loads, freeze-thaw conditions and moist environment is discussed in a comprehensive book by Karbhari [72]. Structural health monitoring and field evaluation of FRP composites' durability are also explained in the book [72] and the recent review paper [73]. Ageing effects on mechanical properties of FRP are discussed in [74,75].…”

Section: Durability Aspects Of Frp Compositesmentioning

confidence: 99%

Fibre-Reinforced Polymer (FRP) in Civil Engineering

Qureshi¹

2023

Next Generation Fiber-Reinforced Composites - New Insights

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Construction produces a third of global carbon emissions. These emissions cause global warming and contribute to climate emergency. There is a need to encourage use of sustainable and eco-friendly materials to effectively deal with climate emergency. Fibre-reinforced polymer (FRP) is an eco-friendly material with low-carbon footprint. FRP composites in civil engineering are mainly used in three applications: (1) FRP profiles in new-build; (2) FRP-reinforcing bar in concrete members and (3) FRP in repair and rehabilitation of existing structures. This chapter presents basic properties of constituent materials (fibres and polymer resins), mechanical properties of FRP bars, strengthening systems and profiles, manufacturing processes and civil engineering applications of FRP composites. Durability, sustainability and recycling of FRP composites are also discussed.

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“…13 However, challenges include non-uniform heat distribution and the necessity of preliminary parametric studies to apply the optimum welding process. 14 Although mechanical connections are widely used to bring together structural components, they also bring some concerns. A bolt hole can produce large stress concentrations in the structure and drastically reduce the material's fatigue life.…”

Section: Introductionmentioning

confidence: 99%

“…Fusion bonding techniques are efficient for joining thermoplastic composites, producing comparable or higher‐performance structures than adhesive or mechanical bonding 13 . However, challenges include non‐uniform heat distribution and the necessity of preliminary parametric studies to apply the optimum welding process 14 . Although mechanical connections are widely used to bring together structural components, they also bring some concerns.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of thermoplastic and thermoset adhesives performance and the influence on failure analysis in jointed elium‐based composite structures

Kaybal,

Ulus

2023

Polymer Composites

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The preference for thermoplastic composites over thermoset ones is steadily growing, especially in constructing resilient, lightweight, and fuel‐efficient structures in industrial settings due to their recyclability and superior energy absorption. Elium®, an acrylic‐based thermoplastic resin, offers enhanced stiffness and improved toughness at room temperature. Investigation into elium‐based composites with diverse fiber reinforcements has revealed elium's potential as an alternative to traditional thermoset epoxy resins. This study explores recyclable elium resin as an adhesive for creating curable and non‐permanent joints in various elium‐based composites. Various joining techniques, including adhesive bonding, mechanical joints, and hybrid bolted/bonded connections, were assessed, with hybrid bonded/bolted (HBB) joints emerging as a preferred solution for structures requiring higher load‐carrying capacity. The study's results indicate that, when using elium adhesive, elium‐hybrid bolted/bonded (HBB) joints demonstrate superior mechanical strength compared to their epoxy counterparts, resulting in improved toughness and stiffness values for each type of composite material. In addition, the research demonstrates superior load‐bearing strengths in bonded glass/elium composite joints using elium adhesive compared to bolted joints, with HBB joints featuring elium adhesive displaying even higher load‐bearing strengths. This research highlights the potential of elium‐based composites and adhesives in various industrial applications, enabling the production of lightweight, robust structures with exceptional damage tolerance.Highlights Investigates recyclable elium resin for curable and non‐permanent joints. Elium‐based composites offer lightweight, robust, and damage‐tolerant structures. Elium HBB joints demonstrate superior strength. FTIR analysis reveals distinct chemical signatures and bonding characteristics. Elium adhesive enhances bond strength.

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Damage monitoring methods for fiber-reinforced polymer joints: A review

Cited by 40 publications

References 180 publications

Sandwich Face Layer Debonding Detection and Size Estimation by Machine-Learning-Based Evaluation of Electromechanical Impedance Measurements

Sandwich Face Layer Debonding Detection and Size Estimation by Machine-Learning-Based Evaluation of Electromechanical Impedance Measurements

Fibre-Reinforced Polymer (FRP) in Civil Engineering

Comparative analysis of thermoplastic and thermoset adhesives performance and the influence on failure analysis in jointed elium‐based composite structures

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