Fast prediction of the Wöhler curve from heat build-up measurements on Short Fiber Reinforced Plastic

Jegou, Loïc; Marco, Yann; Saux, V. Le; Calloch, Sylvain

doi:10.1016/j.ijfatigue.2012.09.007

Cited by 89 publications

(52 citation statements)

References 36 publications

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“…However this approach requires as input apart from one SN curve, a fatigue crack growth parameter. Meneghetti et al [23] and Jegou et al [24] proposed a method for SN curve prediction of SFRC based on the specific heat dissipation due to damage propagation. Both these approaches require rather extensive and difficult tests.…”

Section: Introductionmentioning

confidence: 99%

A feasibility study of the Master SN curve approach for short fiber reinforced composites

Jain

Paepegem

Verpoest

et al. 2016

International Journal of Fatigue

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Short fiber reinforced composite (SFRC) materials have a different fiber orientation distribution (FOD) at every point. The fatigue properties of SFRC are known to depend on the FOD.The Master SN curve (MSNC) method for predicting an SN curve for a given FOD based on the known SN curve for the reference FOD is used to predict the local SN curve of a SFRC component by relating the damage at the microscopic level to the macroscopic fatigue properties. A simplified version of MSNC method, which needs even less experimental input, uses an assumption of constant SN curve slope is also presented in this paper. The paper validates both variants of the MSNC method on three sets of experimental data on fatigue of short fiber composites and analyses their accuracy. It is demonstrated that the MSNC approach needs only one SN curve as input with no specific requirements to the fiber orientation of the test coupon. Test coupons could have either uniform fiber orientation in the thickness or a "skin core" orientation variation. Highlights: A method for generating local SN curves for short fiber composites is presented  Method is based on combination of manufacturing studies, tests and micromechanics  Slope of SN curve is found to be independent of fiber orientation distribution(FOD)  Only one SN curve is needed as input with no restriction on FOD of reference coupon

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Section: Introductionmentioning

confidence: 99%

A feasibility study of the Master SN curve approach for short fiber reinforced composites

Jain

Paepegem

Verpoest

et al. 2016

International Journal of Fatigue

View full text Add to dashboard Cite

show abstract

“…3). This approach has been proven efficient for metallic materials [3]- [7] and successfully verified for some composites [8], [9] : the specific load value between the two thermal tendencies during the self-heating tests is related to the fatigue limit determined on the Wöhler curve. It seems that the self-heating monitoring can indeed enable a reliable monitory of fatigue damage.…”

Section: Fig 1 : Wöhler Curve and Fatigue Limitmentioning

confidence: 99%

Experimental monitoring of the self-heating properties of thermoplastic composite materials during tensile and cyclic tests

et al. 2018

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Abstract. The sizing of industrial structures with a given material requires to understand completely its fatigue behaviour. Yet, the full estimation of the fatigue lifetime of a material requires time-consuming and expensive fatigue testing campaigns, and a huge number of samples. An alternative experimental procedure is based on the monitoring of the self-heating properties of the studied material. The aim is to correlate the fatigue limit with a change of the thermal behaviour of the material during the self-heating tests. The main advantage of these tests is that they need only a limited number of mechanical cycles, and require few samples to test. Ultimately, self-heating tests lead to an accelerated estimation of the fatigue behaviour. The purpose of the present paper is to validate this approach for a woven carbon/thermoplastic composite material.

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“…To do so, one can consider either an adiabatic analysis [5] [11] or a stationary analysis [12]. In our study, the stationary state analysis was chosen, in order to catch the thermal response over the full diameter of the ropes.…”

Section: Heat Build-up Testsmentioning

confidence: 99%

Fatigue of polyamide mooring ropes for floating wind turbines

et al. 2018

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Abstract. This paper describes a study of the fatigue characterization of polyamide mooring ropes for floating wind turbines. Under some conditions polyester ropes, which are favoured for offshore platform station-keeping, are too stiff for wind turbine moorings, and polyamide may be a suitable alternative. While early studies on fatigue of braided nylon ropes showed very short lifetimes some recent results have indicated that it is possible to significantly enhance lifetime by modifying rope construction and improving fibre coatings [1]. The fatigue results presented here for ropes from a different supplier, confirm this result. In order to develop an accelerated evaluation of the fatigue performance, heat build-up tests have been performed, and promising first results are shown. Finally, the influence of coating is examined by microscopy and yarn-on-yarn tests, in order to improve understanding of the fatigue mechanisms leading to failure. IntroductionAs the development of Marine Energy Converter systems (such as wave energy generators, tidal current turbines and floating wind turbines) starts to flourish, there is a need for mooring lines in shallow water (between 50 and 100 m). Since these applications aim at harnessing marine energies, the systems are located on exposed area where dynamic loading are significant. In addition, the inherent moderate to small water depth induce a global stiff behaviour of the mooring system in using standard components as per done for deepwater floating oil platforms [1] (steel chains or polyester rope).The system integrity will be maintained by damping the dynamic loadings, so requiring the use of more stretchable fibre ropes than polyester. also examined a nylon rope which had been tested at sea for 18 months on a wave energy buoy, and showed the importance of loading history and operating conditions on nylon performance.The idea of using long term mooring lines in this material is relatively new, and there is little knowledge on the durability behaviour of such structures. It is therefore crucial to further investigate the behaviour of polyamide mooring ropes, in order to optimise their utilisation.The database is still very limited, only the paper by Ridge et al provides long lay length stranded PA rope fatigue results [3]. Thus the deployment of these fibres for permanent mooring is currently impossible due to the lack of data on their long term mechanical properties.The goals of the present study are therefore to provide a better understanding of the mechanical behaviour and the fatigue damage of these polyamide ropes, in order to help designing floating wind turbine mooring lines. However, fatigue studies are quite long and costly, this is why an evaluation of rapid characterization by heat build-up measurements [5] [6] has been included in the test programme. This kind of test has proven to be efficient on a wide range of materials [7]. These techniques have been developed and successfully applied in recent years to various polymeric materials included polyamide, from ...

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Fast prediction of the Wöhler curve from heat build-up measurements on Short Fiber Reinforced Plastic

Cited by 89 publications

References 36 publications

A feasibility study of the Master SN curve approach for short fiber reinforced composites

A feasibility study of the Master SN curve approach for short fiber reinforced composites

Experimental monitoring of the self-heating properties of thermoplastic composite materials during tensile and cyclic tests

Fatigue of polyamide mooring ropes for floating wind turbines

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