Microscopic fatigue processes in a plain-weave glass-fibre composite

Fujii, Toru; Amijima, Sadao; Okubo, Kimihiro

doi:10.1016/0266-3538(93)90063-m

Cited by 72 publications

(37 citation statements)

References 13 publications

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“…Especially in fatigue, the damage initiation phase can cause a pronounced drop of the elastic modulus of 5 to 10 %. In the next damage propagation phase, the stiffness continues to decrease gradually, ranging from a few percent for unidirectionally reinforced carbon composites to several tens of percents for multidirectional glass laminates [6,7,8,9,10,11,12,13]. Furthermore, most onedimensional damage models for fibre-reinforced composites only account for the effect of damage on the stiffness [5,13,14,15,16,17,18,19,20,21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

On the tension–tension fatigue behaviour of a carbon reinforced thermoplastic part I: Limitations of the ASTM D3039/D3479 standard

et al. 2011

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Investigating the fatigue behaviour of a material often requires a lot of experiments in order to have statistically valid results. However, the number of successful fatigue experiments, meaning tab failure did not occur, can be significantly smaller than the total number of experiments. This manuscript studies the fatigue behaviour of a carbon fabric reinforced PPS using the specimen geometry proposed by the ASTM D3479/D3479M standard. As it turns out, all specimens failed in the tabbed section, meaning that fatigue life may be significantly underestimated and that the proposed geometry needs for improvement. Therefore, the main emphasis in this manuscript lies on the stiffness degradation and the permanent deformation of the material, rather than on the number of cycles till failure. It may be concluded that for the [(0°,90°)] 4s stacking sequence the material does not show significant stiffness reduction and that only limited permanent deformation is present. Furthermore, the material shows very brittle failure behaviour and the stress-span between infinite fatigue life and failure in a few dozen cycles is very narrow.

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Section: Introductionmentioning

confidence: 99%

On the tension–tension fatigue behaviour of a carbon reinforced thermoplastic part I: Limitations of the ASTM D3039/D3479 standard

et al. 2011

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“…Especially in fatigue, the damage initiation phase can cause a pronounced drop of the elastic modulus of 5 to 10 %. In the next damage propagation phase, the stiffness continues to decrease gradually, ranging from a few percent for unidirectionally reinforced carbon composites to several tens of percents for multidirectional glass laminates [3][4][5][6][7]. Most one-dimensional damage models for fibre-reinforced composites only account for the effect of damage on the stiffness [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Monitoring quasi-static and cyclic fatigue damage in fibre-reinforced plastics by Poisson’s ratio evolution

Paepegem

Baere

Lamkanfi

et al. 2010

International Journal of Fatigue

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Even if the extent of fatigue damage in fibre-reinforced plastics is limited, it can already affect the elastic properties. Therefore, the damage initiation and propagation in composite structures is monitored very carefully. Beside the use of nondestructive testing methods (ultrasonic inspection, optical fibre sensing), the follow-up of the degradation of engineering properties such as the stiffness is a common approach. In this paper, it is proved that the Poisson's ratio can be used as a sensitive indicator of fatigue damage in fibre-reinforced plastics. Static tests, quasi-static cyclic tests and fatigue tests were performed on [0°/90°] 2s glass/epoxy laminates, and longitudinal and transverse strain were measured continuously. The evolution of the Poisson's ratio ν xy versus time and longitudinal strain ε xx is studied. As the transverse strain measurement is crucial to monitor the degradation of the Poisson's ratio, three techniques were applied to measure the transverse strain (strain gauges, mechanical extensometer and external optical fibre sensor). Finally, the technique has been applied to a totally different material: a carbon fabric thermoplastic composite. The results show a very similar degradation of the Poisson's ratio, although no stiffness degradation can be observed during fatigue loading of this material. It is concluded that the degradation of the Poisson's ratio can be a valuable indicator of fatigue damage, in combination with the stiffness degradation.

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“…Each cluster is then associated to one damage mechanism. Studies dealing with woven composite damage process have highlighted three major damage types: matrix cracking, interface damage and fibre breakage [12,13,14,15]. Thus, it was chosen to create three clusters.…”

Section: Acoustic Emission (Ae)mentioning

confidence: 99%

Fatigue behaviour of open-hole samples and automotive mini-structures made of woven glass-fibre-reinforced polyamide 6,6

et al. 2018

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Abstract. In the automotive industry, the integration of thermoplastic composite components represents a high-potential solution to the mass reduction challenge. In this study, a woven glassfibre-reinforced composite with a polyamide 6,6 matrix is considered for the purpose of being integrated into automotive parts. Tension-tension fatigue tests were conducted on [(0/90) 3 ] openhole samples. These tests were instrumented with non-destructive techniques, namely acoustic emission and infrared thermography. Acoustic emission results showed fibre-matrix debonding and fibre breakages in open-hole samples, located around the hole. Furthermore, 3-point bending fatigue tests were performed on "omega" mini-structures. A semi-empirical model was used in order to predict the fatigue lives of both open-hole coupons and automotive mini-structures. Predictions of the model for open-holes samples underestimate experimental fatigue lives. Nevertheless, the semiempirical model showed good results for the fatigue life prediction of composite mini-structures.

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Microscopic fatigue processes in a plain-weave glass-fibre composite

Cited by 72 publications

References 13 publications

On the tension–tension fatigue behaviour of a carbon reinforced thermoplastic part I: Limitations of the ASTM D3039/D3479 standard

On the tension–tension fatigue behaviour of a carbon reinforced thermoplastic part I: Limitations of the ASTM D3039/D3479 standard

Monitoring quasi-static and cyclic fatigue damage in fibre-reinforced plastics by Poisson’s ratio evolution

Fatigue behaviour of open-hole samples and automotive mini-structures made of woven glass-fibre-reinforced polyamide 6,6

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