High-temperature strength and storage modulus in unidirectional hybrid composites

Bosze, E.J.; Alawar, Ahmad; Bertschger, O.; Tsai, Yun-I.; Nutt, Steven

doi:10.1016/j.compscitech.2006.01.020

Cited by 56 publications

(36 citation statements)

References 15 publications

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“…The figures indicate adequate agreement between the numerical model and the tests. Moreover, the equation is also validated by the test results from the study by Bosze et al, 9 as shown in Figures 12 and 13. In Equation (10), the parameters of T g and ÁT(¼ T efg À T eig ) can be identified from DMA of resin matrix.…”

Section: Modeling Of the Temperature-dependent Tensile Strength Of Cfmentioning

confidence: 92%

Evaluation and prediction of temperature-dependent tensile strength of unidirectional carbon fiber-reinforced polymer composites

Cao

Wang

2011

Journal of Reinforced Plastics and Composites

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To predict temperature-dependent tensile strength of unidirectional CFRP composites, numerical analysis and model simulation were conducted in terms of experimental results. The effect of elevated temperatures on tensile strength of CFRP sheets was evaluated between 20 C and 120 C, and the storage moduli of two types of epoxy resins, with glass transition temperatures (T g ) of 42 C and 45 C, were tested by DMA. The tensile experiments of CFRP sheets show that the tensile strength exhibits stable behavior at the low-temperature range (below glass transition temperature), but drops rapidly during the glass transition region, and then reaches a plateau. Analysis results indicate that the degradation of tensile strength is mainly due to matrix softening and loss of fiber-matrix adhesion, based on which a semi-empirical model is proposed to precisely describe tensile strength reduction as the temperature increases. The parameters of the model consist of the glass transition temperature of polymer matrix, the polymer glass transition region, and the residual strength after the glass transition region. Model prediction of tensile strength vs. temperature shows good agreement with the experimental results.

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Section: Modeling Of the Temperature-dependent Tensile Strength Of Cfmentioning

confidence: 92%

Evaluation and prediction of temperature-dependent tensile strength of unidirectional carbon fiber-reinforced polymer composites

Cao

Wang

2011

Journal of Reinforced Plastics and Composites

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“…Em um estudo realizando por Bosze et al (2006) sobre do efeito da temperatura na resistência à tração e correlação entre a resistência à tração e o módulo de armazenamento, medido por DMA, a T g foi determinada pelo pico da curva de tan δ. Também por DMA foi verificado a cura completa da resina [41]. Neste estudo, verifica-se a presença de duas reações de polimerização da amostra 1, conforme indicado na Figura 8.…”

Section: A) Curvas Características Para Polímerosunclassified

Dynamic Mechanical Analysis (DMA) of Polymeric Composite Materials

2016

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ResumoMateriais compósitos poliméricos vem sendo estudados nas mais diversas áreas da ciência dos materiais com o objetivo de substituir outros tipos de matérias-primas e melhorar o desempenho na sua aplicação. Dentre as diversas técnicas existentes, a análise dinâmico-mecânica (DMA) tem-se mostrado uma boa alternativa para avaliar as propriedades destes compósitos, em especial os parâmetros viscoelásticos em função do tempo, temperatura ou frequência. Propriedades importantes como como módulos de armazenamento e perda, e temperaturas de transição podem ser obtidas através desta técnica. O presente artigo traz uma revisão a respeito da técnica de DMA, suas vantagens em relação a outras análises térmicas e mecânicas, o comportamento de materiais compósitos poliméricos durante a análise e os parâmetros que podem ser estudados por ela. A importância da análise no estudo de materiais de engenharia também é relatado, em especial em aplicações aeroespaciais. Palavras-chaveCompósitos poliméricos; análise dinâmico-mecânica (DMA); materiais de engenharia; compósitos estruturais. Dynamic Mechanical Analysis (DMA) of Polymeric Composite Materials AbstractPolymeric composite materials have been studied in many fields in materials science, with the aim of replacing other materials and reaching better performance when applied. Among the existing techniques, a great alternative to evaluate composites properties is dynamic mechanical analysis (DMA), especially when viscoelastic parameters need to be studied as a function of time, temperature or frequency.Important properties, such as storage modulus, loss modulus and transitions temperaturescan be determined by this technique. The present paper brings a review about DMA, the advantages of this technique compared to others thermal and mechanical analysis, the behavior of polymeric composite materials during the tests and the properties which can be determined by DMA. The importance of DMA in the study of engineering materialsis also presented, especially when applied in aircraft structures.

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“…Their experimental tests on the GFRP bars show that the temperature above the glass transition temperature causes deterioration in the tensile properties of the bars due to the weakening of the resin and the resin-fiber interface [1][2][3][4][5][6][7][8]. In the experiment done by Wang and Kodur [4], the tensile strength retention of the GFRP rebar is only 58% in the case of 200 ∘ C exposed temperature level.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effects of Concrete Alkalinity on Tensile Properties of Preheated Structural GFRP Rebar

Roh

Park

Moon

2017

Advances in Materials Science and Engineering

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The combined effects of preexposure to high temperature and alkalinity on the tensile performance of structural GFRP reinforcing bars are experimentally investigated. A total of 105 GFRP bar specimens are preexposed to high temperature between 120 ∘ C and 200 ∘ C and then immersed into pH of 12.6 alkaline solution for 100, 300, and 660 days. From the test results, the elastic modulus obtained at 300 immersion days is almost the same as those of 660 immersion days. For all alkali immersion days considered in the test, the preheated specimens provide slightly lower elastic modulus than the unpreheated specimens, showing only 8% maximum difference. The tensile strength decreases for all testing cases as the increase of the alkaline immersing time, regardless of the prehearing levels. The tensile strength of the preheated specimens is about 90% of the unpreheated specimen for 300 alkali immersion days. However, after 300 alkali immersion days the tensile strengths are almost identical to each other. Such results indicate that the tensile strength and elastic modulus of the structural GFRP reinforcing bars are closely related to alkali immersion days, not much related to the preheating levels. The specimens show a typical tensile failure around the preheated location.

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High-temperature strength and storage modulus in unidirectional hybrid composites

Cited by 56 publications

References 15 publications

Evaluation and prediction of temperature-dependent tensile strength of unidirectional carbon fiber-reinforced polymer composites

Evaluation and prediction of temperature-dependent tensile strength of unidirectional carbon fiber-reinforced polymer composites

Dynamic Mechanical Analysis (DMA) of Polymeric Composite Materials

Experimental Investigation of the Effects of Concrete Alkalinity on Tensile Properties of Preheated Structural GFRP Rebar

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