Accelerated Creep Testing of CFRP with the Stepped Isostress Method

Tanks, Jonathon; Rader, Katherine E.; Sharp, Stephen R

doi:10.1007/978-3-319-21762-8_46

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Effect of crystallinity on the creep behavior of PA and GFRPA Previous studies Sakai and Somiya (2006, 2009, Sakai et al (2007Sakai et al ( , 2011aSakai et al ( , 2011bSakai et al ( , 2015 and Tanks et al (2016) have detailed creep behavior as a function of time, temperature, fiber volume fraction, physical aging, and crystallinity. These reports discussed the application of the TTSP and proposed a master curve of creep compliance showing the effect of each influencing variable.…”

Section: Resultsmentioning

confidence: 99%

“…In previous studies, Sakai and Somiya (2006, 2009, Sakai et al (2007Sakai et al ( , 2011aSakai et al ( , 2011bSakai et al ( , 2015 and Tanks et al (2016) investigated the relationships between creep behavior, crystallinity, and the fiber volume fraction of a variety of polymers. The effects of these variables are described by shift factors that can be used to generate time-temperature curves at any given percent crystallinity or fiber volume fraction.…”

Section: Introductionmentioning

confidence: 99%

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Estimating the creep behavior of glass-fiber-reinforced polyamide considering the effects of crystallinity and fiber volume fraction

Sakai

Hirai

Somiya

2018

Mech Adv Mater Mod Process

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Background: The time-temperature superposition principle (TTSP) is often used to estimate the viscoelastic behavior of polymers. It can also be used to evaluate the influence of a given variable, or set of variables, on viscoelastic properties. In this research, the effects of time, temperature, fiber volume fraction and the relative crystallinity of polyamide (PA) and glass fiber-reinforced polyamide (GFRPA) were investigated using the timetemperature superposition principle to estimate viscoelastic behavior under each set of conditions. Methods: The crystallinities of PA and GFRPA, which ranged from 33 to 45%, were controlled by adjusting the duration of crystallization as 250°C. Creep tests were carried out with these materials, and creep compliance curves of each condition were obtained. Results: Using these creep compliance curves, the master curves for temperature, and the grand master curves for crystallinity and for fiber volume fraction were generated to show the relationships between fiber volume fraction, crystallinity, and viscoelastic parameters. Furthermore, the great-grand master curve for crystallinity and fiber volume fraction was generated to predict creep behavior in an arbitrarily condition. The predicted data were in good agreement with experimental results. Conclusions: A method for estimating creep deformation taking into account the effects of influencing variables was developed. The time-temperature superposition principle (TTSP) was applied to the effects of the fiber volume fraction and crystallinity. Grand master curves for crystallinity and fiber volume fraction were obtained by shifting the corresponding master curves. This study demonstrates that the creep behaviors of fiber-reinforced plastics can be estimated using these shift factors and a great-grand master curve. This method yielded estimates of creep deformation that fitted well with experimental results. Based on our findings, it should be possible to control creep deformation in plastics or fiber-reinforced resins by controlling the fiber volume fraction and the crystallinity of the matrix material.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estimating the creep behavior of glass-fiber-reinforced polyamide considering the effects of crystallinity and fiber volume fraction

Sakai

Hirai

Somiya

2018

Mech Adv Mater Mod Process

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“…При этом повышение температуры испытаний до температуры, близкой к температуре стеклования, позволит быстрее проявиться эффектам ползучести в материале, тем самым снизив длительность эксперимента[18,19].Для изготовления образцов на ползучесть из композитной оболочки МКБВД были вырезаны плоские однонаправленные композитные ленты длиной 150 мм и шириной от 10 до 21 мм.Средняя толщина лент составляла 0,3 мм. Длина рабочей части в среднем равнялась 90 мм.На концы лент приклеивались композитные накладки толщиной 3 мм для жесткой фиксации образцов в захватах испытательной машины (рис.…”

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Experimental Studies of Creep of Unidirectional Composite Material of Composite Overwrapped Pressure Vessel

Eremin¹,

Moskvichev²,

Пасечник³

2021

J. Sib. Fed. Univ. Eng. technol.

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Experimental studies of creep of a composite material of a composite overwrapped pressure vessel are presented. Composite material was an unidirectional tape based on IMS60 carbon fibers and epoxy resin. Creep tests were carried out at various loads and temperatures, taking into account the stress level in structure and measured glass transition temperature of the material. For testing, special equipment was used to install specimens in the grips of the testing machine. According to the test results, the creep curves were obtained. Creep curves according to Findlay's model are presented. For the stage of steady-state creep, the variation of the creep rate at different temperatures were determined, and the average value of the creep rate was calculated for all tested specimens. The results of the obtained data can be used in numerical models for predicting strains of a composite overwrapped pressure vessel under creep conditions

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Accelerated creep and creep-rupture testing of transverse unidirectional carbon/epoxy lamina based on the stepped isostress method

Tanks

Rader

Sharp

et al. 2017

Composite Structures

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Accelerated Creep Testing of CFRP with the Stepped Isostress Method

Cited by 4 publications

References 11 publications

Estimating the creep behavior of glass-fiber-reinforced polyamide considering the effects of crystallinity and fiber volume fraction

Estimating the creep behavior of glass-fiber-reinforced polyamide considering the effects of crystallinity and fiber volume fraction

Experimental Studies of Creep of Unidirectional Composite Material of Composite Overwrapped Pressure Vessel

Accelerated creep and creep-rupture testing of transverse unidirectional carbon/epoxy lamina based on the stepped isostress method

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