Prediction of long-term durability of unidirectional CFRP

Koyanagi, Jun; Nakada, Masayuki; Miyano, Yasushi

doi:10.1177/0731684411420314

Cited by 15 publications

(12 citation statements)

References 22 publications

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“…However, GFRPs have relatively low tensile strength and modulus and are prone to degrade owing to hydrolysis, plasticization, and swelling of matrices and debonding of fiber/matrices when exposed to hydrothermal conditions [19,20]. By contrast, carbon fiber reinforced polymer (CFRP) composites possess excellent chemical and corrosion resistance, and higher modulus and strength, but lower strain at break [21,22,23,24,25]. However, the high cost of CFRPs is a serious drawback and limits its applicability in many engineering structures.…”

Section: Introductionmentioning

confidence: 99%

Water Absorption and Distribution in a Pultruded Unidirectional Carbon/Glass Hybrid Rod under Hydraulic Pressure and Elevated Temperatures

Xian

2018

Polymers

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A pultruded unidirectional carbon/glass reinforced epoxy hybrid FRP rod with 19 mm of diameter was developed for a sucker rod and lifting oil wells. The rod possesses a 12-mm diameter carbon fiber core and a 3.5-mm thick outer shell. The rod was exposed to high-temperature immersion in water under hydraulic pressure. To understand the long-term service performance of the rod, immersions in water at 20 °C, 40 °C, or 60 °C under 20 MPa of pressure for 1 year were conducted on the water uptake and distribution in the rod. The water uptake data were fitted by Fickian diffusion law, and the diffusion coefficient and the maximum water uptake were derived. Water distribution in the rod as a function of the immersion time, temperature, and hydraulic pressure was analyzed theoretically. This study revealed the accelerating effects of the elevated temperatures and the hydraulic pressure on the water diffusion in the hybrid rod.

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Section: Introductionmentioning

confidence: 99%

Water Absorption and Distribution in a Pultruded Unidirectional Carbon/Glass Hybrid Rod under Hydraulic Pressure and Elevated Temperatures

Xian

2018

Polymers

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“…In Kumar and Talreja [6] and Koyanagi et al [23], the purely elastic part of the Wiechert model is absent for the cases of pure resin or the transverse properties of the UD composite, so that (20) can be further simplified as…”

Section: Damage Evolution Law For the Transverse Direction Behaviour mentioning

confidence: 99%

A continuum damage model for transverse cracking in UD composites of linear viscoelastic behaviour

Jones

2019

Composite Structures

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A damage model for linear viscoelastic unidirectional (UD) composites undergoing transverse matrix cracking is proposed. The damage representation for the corresponding elastic UD composite with an array of dispersed matrix cracks was derived from Li's work based on continuum damage mechanics (CDM). The elastic-viscoelastic correspondence principle (CP) was used to obtain the damage representation for corresponding linear viscoelastic UD composites in the Laplace domain, and re-expressed the time domain by taking the inverse Laplace transformation. A damage evolution law was constructed using the Weibull distribution of defects which will develop into cracks as a result of deformation. The timetemperature superposition principle (TTSP) approach has been incorporated into this model. Applications of this damage model are described in detail, and the predictions are compared with experimental data.

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“…The SFF is semi-empirical model and can estimate reasonably various composite strengths. Also for the time-dependent strength, it has been presented that SFF can follow the strength as function of time (10) . The relationship between composite strength and time is shown in Fig.…”

Section: Time-dependent Hoop Failurementioning

confidence: 99%

Development of High-Performance CFRP Flywheel

Koyanagi

Hojo

Yoshimura

et al. 2013

JMMP

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This paper reports state of progress for development of high-performance CFRP flywheel. For the development, high specific energy density and durability are required. A new fabricating method suggested in our previous work (Mechanics of Time-Dependent Materials 2012) is employed for the CFRP flywheel. According to the method the fabricated flywheel does not have radial stress and the ultimate failure is dominated by hoop stress. A spin test is conducted for the fabricated CFRP flywheel. Strain gauge and digital image correlation methods are employed for the rotational strain measurement. The both methods verify very little rotational radial strain, which means the radial stress is also little. As a first step of the development of high-performance CFRP flywheel, the feasibility of no-radial stress flywheel fabrication is indicated by this study.

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Prediction of long-term durability of unidirectional CFRP

Cited by 15 publications

References 22 publications

Water Absorption and Distribution in a Pultruded Unidirectional Carbon/Glass Hybrid Rod under Hydraulic Pressure and Elevated Temperatures

Water Absorption and Distribution in a Pultruded Unidirectional Carbon/Glass Hybrid Rod under Hydraulic Pressure and Elevated Temperatures

A continuum damage model for transverse cracking in UD composites of linear viscoelastic behaviour

Development of High-Performance CFRP Flywheel

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