Comparative characterization of quasi-static and cyclic deformation behavior of glass fiber-reinforced polyurethane (GFR-PU) and epoxy (GFR-EP)

Huelsbusch, Daniel; Jamrozy, Michael; Frieling, Gerrit; Mueller, Yves; Barandun, Gion Andrea; Niedermeier, Michael; Walther, Frank

doi:10.3139/120.110972

Cited by 15 publications

(4 citation statements)

References 18 publications

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“…Moreover, the Wet conditioning exhibits a particular behaviour, with a significant increase during the first 30% of fatigue cycles. This can be explained by the fact that the hysteresis loop area corresponds with the energy dissipated in the material by several phenomena like viscosity, plasticity, self-heating and damage [57]. It confirms again that the presence of water, during the storage and during the fatigue tests, considerably modifies the behaviour of this plant fibre composite.…”

Section: Fig 9 Evolution Of the Maximum Strain During Fatigue Tests On [(±45)] 7 Woven Hemp/epoxy Composites For Eachsupporting

confidence: 68%

Influence of moisture and drying on fatigue damage mechanisms in a woven hemp/epoxy composite: Acoustic emission and micro-CT analysis

Barbiere

Touchard

Chocinski–Arnault

et al. 2020

International Journal of Fatigue

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For the last 20 years, plant fibres have emerged as an alternative to glass fibres in composites.However, a crucial issue with plant fibre composites is their durability, i.e. their long-term hygrothermal and fatigue performances. This study deals with the influence of different conditionings (Ambient, Wet and Wet/dry) on the fatigue behaviour of [(±45)] 7 hemp/epoxy composites. The induced damage mechanisms are investigated by acoustic emission and micro-CT. Results show that the Wet samples exhibit the lowest fatigue sensitivity despite their greatest damage quantity, whereas the Wet/dry specimens behave like pre-damaged Ambient ones.Micro-CT scans show that the same type of damage appears in all cases: cracks are made of a coalescence of partial debondings at hemp yarn/matrix interfaces, which can lead to macro-cracks crossing the sample thickness.Moreover it is demonstrated that, during fatigue tests, the evolution of cumulative AE energy and hysteresis loop energy, and the evolution of damage quantity measured by micro-CT and final hysteresis energy, are very similar whatever the conditioning.

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Section: Fig 9 Evolution Of the Maximum Strain During Fatigue Tests On [(±45)] 7 Woven Hemp/epoxy Composites For Eachsupporting

confidence: 68%

Influence of moisture and drying on fatigue damage mechanisms in a woven hemp/epoxy composite: Acoustic emission and micro-CT analysis

Barbiere

Touchard

Chocinski–Arnault

et al. 2020

International Journal of Fatigue

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“…The energy dissipated per cycle is generated through internal friction, which produces heat, and micro-plastic strain, which involves crack formation [25][26][27]. Internal friction increases proportionally with the applied strain level, implying that energy dissipation is higher at higher strain levels.…”

Section: Loss Factor and Energy Dissipationmentioning

confidence: 99%

Uniaxial fatigue study of a natural-based bio-composite material reinforced with fique natural fibers

Chaves Garcia,

Castro Bermudez,

Pertuz Comas

2024

Frattura Ed Integrità Strutturale

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This research addresses environmental concerns by exploring environmentally friendly composite materials as substitutes for non-biodegradable synthetic fibers. The study proposes the development of polymer matrix composites reinforced with natural fique fibers, sourced from a plant cultivated in Colombia. A BioPoxy 36 polymer matrix with a high carbon content was used and reinforced with fique fabric using the vacuum-assisted lamination method. To improve the adhesion between the fibers and the matrix, an alkaline chemical treatment was applied to the fiber using 2% sodium hydroxide by weight. Mechanical properties were assessed through ASTM D3039 tensile and ASTM D3479 fatigue tests. A fractographic analysis was also conducted to identify the different modes of failure present. In terms of material degradation, distinct stages were observed, characterized by stiffness loss and loss factor indicators. The Coffin-Manson model was used to obtain the strain life curve for R = 0.1, using these factors as criteria. The static properties of the composite reinforced with fique fibers indicate an increase of 45% in ultimate strength, 145% in strain, and 27% in Young's modulus compared to the unreinforced matrix. In terms of dynamic properties, the elastic modulus showed a maximum variation of up to 7.88%. Electron microscopy reveals the failure mechanism, a distinct separation between the matrix and the fiber can be observed as a result of mechanical stress. The analysis reveals the brittle fracture of the hard fique fiber and some matrix separation, as well as possible fractured bubbles that may have occurred during the manufacturing process.

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“…8 and Huelsbusch et al. 9 ascribe a higher sensitivity to the thermal signal as a measure for material changes and due to the thermographic method also to detect the location of damage initiation. This corresponds to a second investigation of CFRP by Backe et al.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the fatigue behavior of thermoplastic composites by load increase tests

Baumann

Backe

Hausmann

2020

Journal of Composite Materials

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Fatigue is one major load case in many structures for transport applications. New materials often lack the necessary data base for a fast application in cyclic loaded components due to time consuming testing series. The aim of this study is the evaluation of the load increase test as method to determine a possible fatigue limit of glass fiber reinforced polyamide 6. Under the working hypothesis that cracks are the main contributors for heat emission, the results show that the investigated material exhibits a different behavior in comparison to thermosets. Instead of crack formation experimental and numerical data indicate that the matrix relaxes under fatigue loading. This relaxation could potentially lead to crack prevention but might also result in the observed sudden failure behavior of the material. These findings suggest a totally different behavior of thermoplastic composites under fatigue loading.

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Comparative characterization of quasi-static and cyclic deformation behavior of glass fiber-reinforced polyurethane (GFR-PU) and epoxy (GFR-EP)

Cited by 15 publications

References 18 publications

Influence of moisture and drying on fatigue damage mechanisms in a woven hemp/epoxy composite: Acoustic emission and micro-CT analysis

Influence of moisture and drying on fatigue damage mechanisms in a woven hemp/epoxy composite: Acoustic emission and micro-CT analysis

Uniaxial fatigue study of a natural-based bio-composite material reinforced with fique natural fibers

Investigation of the fatigue behavior of thermoplastic composites by load increase tests

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