Onset-of-growth behavior of mode II delamination in a carbon fiber composite under spectrum fatigue loads

Jagannathan, N. R.; Anilchandra, A. R.; Manjunatha, C. M.

doi:10.1016/j.compstruct.2015.05.052

Cited by 14 publications

(9 citation statements)

References 27 publications

(37 reference statements)

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“…Finally, a paper by Jagannathan et al 23 should be mentioned; the delamination onset phenomenon in mode II was investigated under spectrum loading. The mini-FALSTAFF sequence was used, with the negative loads truncated in order to allow the three-point bending ENF test set-up being used; the authors propose a cumulative damage law for the prediction of the 5% stiffness reduction condition, under a variable amplitude loading.…”

Section: Literature Reviewmentioning

confidence: 99%

Delamination onset in composite materials due to fatigue loading

Fanteria

Lazzeri

2022

Journal of Composite Materials

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An experimental program has been carried out for the evaluation of the delamination onset condition of various composite material systems, under the application of constant amplitude cyclic loading. Standard Double Cantilever Beam End Notch Flexure and Mixed Mode Bending specimens were used; the assessment of resistance to fatigue delamination onset has been performed by means of procedures defined in similitude with the standard static test procedures, introducing appropriate variants, where necessary. Three materials systems have been investigated: two carbon epoxy unidirectional materials and a carbon epoxy 5-harness satin. Normalised curves show a common trend and allow the identification of onset values for the evaluation of defects tolerance in the “no growth” approach. A similitude with the interlaminar fracture toughness measured in static tests, as a function of mode-mix ratio, has been highlighted with a higher influence of the mode I component. A modification of the Benzeggagh–Kenane relationship is proposed, that captures more faithfully the trend of the onset results.

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Section: Literature Reviewmentioning

confidence: 99%

Delamination onset in composite materials due to fatigue loading

Fanteria

Lazzeri

2022

Journal of Composite Materials

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“…However, the complete damage ( D = 1) for all ten elements happens at the same time (around t = 210 s) immediately after the peak load is attained (at t = 209 s). The total damage ( D = 1) of the elements all occurring at the same instant leads to the sudden drop in the sustained load, implying an unstable crack propagation which is common in an ENF test [ 2 , 21 , 45 , 46 , 47 ]. This phenomenon is known as the crack jump [ 2 ].…”

Section: Numerical Modelingmentioning

confidence: 99%

Displacement Rate Effects on the Mode II Shear Delamination Behavior of Carbon Fiber/Epoxy Composites

et al. 2021

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This paper studies the influence of displacement rate on mode II delamination of unidirectional carbon/epoxy composites. End-notched flexure test is performed at displacement rates of 1, 10, 100 and 500 mm/min. Experimental results reveal that the mode II fracture toughness GIIC increases with the displacement, with a maximum increment of 45% at 100 mm/min. In addition, scanning electron micrographs depict that fiber/matrix interface debonding is the major damage mechanism at 1 mm/min. At higher speeds, significant matrix-dominated shear cusps are observed contributing to higher GIIC. Besides, it is demonstrated that the proposed rate-dependent model is able to fit the experimental data from the current study and the open literature generally well. The mode II fracture toughness measured from the experiment or deduced from the proposed model can be used in the cohesive element model to predict failure. Good agreement is found between the experimental and numerical results, with a maximum difference of 10%. The numerical analyses indicate crack jump occurs suddenly after the peak load is attained, which leads to the unstable crack propagation seen in the experiment.

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“…A record of the applied force versus center roller displacement is obtained using the real-time analog-to-digital (A/D) X-Y recorder of the machine and setting a sampling rate of 50 Hz. The G IIC is obtained using the compliance calibration (CC) method (Jagannathan et al, 2015), which is believed to represent the critical strain energy release rate for crack growth from the insertion film (Bru et al, 2016). The average G IIC results from five replicate tests performed on flat and integrated structures each.…”

Section: Measurement Techniques For Load and Structural Monitoringmentioning

confidence: 99%

Simultaneous load and structural monitoring of a carbon fiber rudder stock: Experimental results from a quasi-static tensile test

Neuschwander

Moll

Memmolo

et al. 2018

Journal of Intelligent Material Systems and Structures

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Carbon-fiber-reinforced plastics are widely used in lightweight marine structures due to their high strength and superior fatigue behavior. In this article, we will present an innovative methodology for simultaneous load and structural monitoring of a carbon-fiber-reinforced plastic rudder stock as part of a big commercial vessel. Experimental results are presented here from a quasi-static tensile test in which the load monitoring is performed using embedded strain sensors. Structural monitoring is based on high-frequency electromechanical impedance spectroscopy combined with dedicated signal processing and surface-mounted piezoelectric transducers. We have achieved the following results: (1) the demonstration of a hybrid monitoring system including load and structural monitoring, (2) successful embedding of strain gauges during composite manufacturing of the carbon-fiber-reinforced plastic rudder stock, (3) development of instrumentation hardware for multichannel electromechanical impedance measurements, and (4) successful damage detection by means of electromechanical impedance spectroscopy in thick carbon-fiber-reinforced plastic rudder stock samples exploiting strain data.

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Onset-of-growth behavior of mode II delamination in a carbon fiber composite under spectrum fatigue loads

Cited by 14 publications

References 27 publications

Delamination onset in composite materials due to fatigue loading

Delamination onset in composite materials due to fatigue loading

Displacement Rate Effects on the Mode II Shear Delamination Behavior of Carbon Fiber/Epoxy Composites

Simultaneous load and structural monitoring of a carbon fiber rudder stock: Experimental results from a quasi-static tensile test

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