An investigation of the damage mechanisms and fatigue life diagrams of flax fiber-reinforced polymer laminates

Sawi, Ihab El; Fawaz, Zouheir; Zitoune, Rédouane; Bougherara, Habiba

doi:10.1007/s10853-013-7934-0

Cited by 67 publications

(78 citation statements)

References 28 publications

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“…For a given loading level, dispersion in fatigue life duration is observed. The order of magnitude of this dispersion is in agreement with data from literature collected on flaxepoxy laminates[2,3,7,9,10], except for 253 and 237 MPa (65% and 61% of the monotonic tensile strength), for which a high scattering in number of cycles at failure is observed. The fatigue strength as a function of number of cycles can be fitted by a logarithmic law (Eq.…”

supporting

confidence: 89%

“…Indeed, the fatigue strength for 10 6 cycles is approximately 200 MPa. It represents approximately 52% of the monotonic tensile strength, which is almost 10 percentage points higher than the value obtained in [4,7]. Again, it shows the high-grade of the material.…”

Section: Influence Of Speed On the Monotonic Tensile Behaviourmentioning

confidence: 53%

“…Fatigue of Plant Fibre Composites (PFCs) has been studied in the last few years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], and most of the available results are critically reviewed in a recent paper [16]. It emphasizes that most of the results are collected on flaxepoxy composites.…”

Section: Introductionmentioning

confidence: 99%

“…For PFCs, both the fibres and the matrix are polymeric materials, so the question can also be raised for unidirectional stacking sequences. El Sawi et al [7] proposed to exploit this self-heating behaviour to determine the fatigue limit of flax-epoxy composite using a thermographic criterion and more exactly by measuring the temperature of the external surface of the specimen during the application of cyclic loading. This approach, originally developed for metallic alloys [24], and sometimes called self-heating tests was previously exploited successfully for carbon fibre reinforced polymer composites [25,26].…”

Section: Introductionmentioning

confidence: 99%

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About the fatigue endurance of unidirectional flax-epoxy composite laminates

Jeannin

Gabrion

Ramasso

et al. 2019

Composites Part B: Engineering

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Even if the knowledge on the fatigue behaviour of plant fibre composites has increased steadily in the last few years, some issues still remain open at the present time. Such is the case, for instance, of the high-cycle fatigue strength. Actually, most of the fatigue studies available in the open literature to date are limited to a maximum of 1-2 million cycles. All available stress-life plots exhibit linear trends with constant slope and does not reveal any fatigue limit for these given cycle numbers. So, this paper proposes to investigate the High-Cycle Fatigue behaviour of a flax-epoxy laminated composite. The effect of loading frequency is firstly evaluated on the Low-Cycle Fatigue behaviour using a multi-instrumented analysis including infrared thermography and acoustic emission. Results show that high frequency could be a suitable method to shorten the fatigue tests and study the High Cycle Fatigue behaviour of this type of composite material. Based on this result, high-frequency (30 Hz) is used to investigate the behaviour of the flax-epoxy composite on a range of 10 6-10 8 cycles. Results show that fatigue damage continues to evolve and the maximum stress continues to decrease as a function of increasing number of cycles, following a power-law trend. This result suggests that, if a fatigue limit does exist for unidirectional flax-epoxy composite laminates, it is so low that it cannot observed in tests up to 10 8 cycles. It is also recommended to take it into consideration when designing plant fibre composite structures.

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supporting

confidence: 89%

Section: Influence Of Speed On the Monotonic Tensile Behaviourmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

About the fatigue endurance of unidirectional flax-epoxy composite laminates

Jeannin

Gabrion

Ramasso

et al. 2019

Composites Part B: Engineering

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“…Due to its importance in engineering, many studies on fatigue using various approaches can be found in previous studies (Mutoh and Xu, 2003;Lee et al, 2012;Alexopoulos et al, 2013;Huang and Xu, 2013;El Sawi et al, 2014;Humayun Kabir et al, 2014). From the point of view of application, the S-N curve method is still the approach most widely used to estimate fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Relationship among S-N curves corresponding to different mean stresses or stress ratios

Hou

2015

JZUS-A

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Abstract:It is well known that the mean stress or stress ratio of fatigue loadings has a strong effect on the shape of S-N curves. An understanding of the relationships among S-N curves corresponding to different mean stresses or stress ratios would be very useful in engineering applications. In this study, based on continuum damage mechanics, a mathematical expression of an S-N curve is deduced from a new damage evolution law. This mathematical expression can well represent the whole S-N curve, not only the linear part in bi-logarithmic diagrams, but also the transitional part near the fatigue limit. The effect of mean stress on an S-N curve is represented by two state parameters. The relationships between these state parameters and the mean stress are proposed and examined. By using these relationships, the concepts of equivalent symmetric amplitude and equivalent symmetric cycles are introduced. We have found that all S-N curves under non-symmetric states can be rearranged into the same curve as that of symmetric fatigue by adopting these equivalent parameters.

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Investigation and Modeling of the Fatigue Damage in Natural Fiber Composites

Bougherara

Sawi

Fawaz

et al. 2015

TMS Middle East ‐ Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015)

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The main objective of this preliminary investigation is to identify and characterize the damage evolution of angle ply ([±45] 16) flax-reinforced epoxy composites using an energy-based damage model combined with Scanning Electron Microscopy (SEM) observations. The damage model's parameters for the flax-reinforced epoxy composite were determined from quasi-static and fatigue tests. The preliminary results showed that the energy-based damage model is able predict accurately the damage rate in both longitudinal and transverse directions for loads. The mechanism of damage initiation in the flax/epoxy composites and the damage evolution, during each test, were monitored using SEM. A direct correlation between the microstructure of the flax-reinforced epoxy composites and the damage was obtained.

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An investigation of the damage mechanisms and fatigue life diagrams of flax fiber-reinforced polymer laminates

Cited by 67 publications

References 28 publications

About the fatigue endurance of unidirectional flax-epoxy composite laminates

About the fatigue endurance of unidirectional flax-epoxy composite laminates

Relationship among S-N curves corresponding to different mean stresses or stress ratios

Investigation and Modeling of the Fatigue Damage in Natural Fiber Composites

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