Models for predicting elastic modulus and tensile strength of carbon, basalt and hybrid carbon-basalt FRP laminates at elevated temperatures

Hawileh, Rami A.; Abdalla, Jamal A.; Hasan, Sara S.; Ziyada, Meena B.; Abu-Obeidah, Adi

doi:10.1016/j.conbuildmat.2016.03.175

Cited by 65 publications

(50 citation statements)

References 22 publications

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“…Regarding to the database of results of accelerated ageing tests of CFRP laminates, the following characteristics can be drawn: More than 63 (elastic modulus) and 76 (tensile strength) series—each series composed of three to six specimens—were considered from 14 research works [ 19 , 66 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 ]; In terms of types of exposure conditions, water immersion, thermal cycles, wet-dry cycles and freeze-thaw cycles were considered; Regardless the type of exposure condition, results obtained from tests under temperatures higher than T g —20 °C were disregarded; Water immersion included tap water, demineralised water and water with chlorides; Tensile (ISO 527-5, ASTM D3039/D3039M) or flexural (ISO 14125/ ASTM D7264) test protocols were adopted for the characterization of the CFRP laminates; Periods of exposure up to 20160 h were found. …”

Section: Accelerated Ageing Versus Natural Ageingmentioning

confidence: 99%

Durability of Epoxy Adhesives and Carbon Fibre Reinforced Polymer Laminates Used in Strengthening Systems: Accelerated Ageing versus Natural Ageing

et al. 2021

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This work addresses the durability of structural epoxy adhesives and carbon fibre reinforced polymer (CFRP) laminates typically used in strengthening of existing reinforced concrete structures exposed to natural ageing. The experimental program included four natural (real) outdoor environments inducing ageing mainly caused by carbonation, freeze-thaw attack, elevated temperatures, and airborne chlorides from seawater. Moreover, a control (reference) environment (20 °C of temperature and 55% of relative humidity) and an environment involving water immersion of the materials under controlled temperature (20 °C of temperature) were also included in this investigation. The characterization involved the assessment of the physical, chemical and mechanical properties along a study period of up to two years. Furthermore, comparisons between the natural ageing tests developed in the scope of the present work and accelerated ageing tests existing in the literature were performed. Regarding to the epoxy adhesives, an increase in the glass transition temperature with the time was observed, while the tensile properties decreased, regardless of the outdoor environment. The CFRP laminates were marginally affected by the studied environments. Despite the remarkable dispersion of the results observed in the accelerated ageing tests for the period investigated, this testing protocol yielded higher mechanical degradation than under natural ageing.

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Section: Accelerated Ageing Versus Natural Ageingmentioning

confidence: 99%

Durability of Epoxy Adhesives and Carbon Fibre Reinforced Polymer Laminates Used in Strengthening Systems: Accelerated Ageing versus Natural Ageing

et al. 2021

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“…This study focuses on the assessment of the applicability of PLA as a matrix of hybrid composites intended for the production of rigid and durable technical injection-molded parts. At this point, it should be added that so far, reports on hybrid composites with carbon and basalt fibers have appeared in only a few publications, and concerned laminates with a thermoset matrix [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Composites of Polylactide with Basalt and Carbon Fibers and Their Thermal Treatment

Kuciel

Romańska

2018

Materials

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In this research, polylactide was hybrid-reinforced and heat-treated in order to obtain durable structural materials with the use of eco-friendly components. Differential scanning calorimetry (DSC) analysis, tensile tests at various temperatures, Vicat tests, impact tests, and microscopic observations were conducted on the annealed and non-heat-treated specimens. The theoretical and true density, as well as water absorption, were also determined. The simultaneous introduction of chopped carbon and basalt fibers in equal mass fractions of 7.5% and 12.5% resulted in satisfactory increases in stiffness and tensile strength. The reinforcing effect was more efficient for the heat-treated composites, especially at elevated temperatures. Heat treatment significantly increased the degree of crystallinity of the matrix, improving heat resistance and reducing water absorption. It also reduced the stress concentrations in the injection-molded specimens.

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“…where fc and εc are the compressive stress and the axial strain of confined concrete, * is the peak strain of actively confined concrete [32,42], r is the concrete brittleness [45], fc,res is the residual stress, and is the axial strain corresponding to the inflection point of the descending branch of stress-strain curve [33]. These last parameters are defined in the next equations: (23) In equation (20), εc0 is the axial strain at the peak stress of the unconfined concrete ( 0 ) given by [32]:…”

Section: Hardening/softening Rulementioning

confidence: 99%

3D finite element model for hybrid FRP-confined concrete in compression using modified CDPM

Ribeiro

Sena-Cruz

Branco

et al. 2019

Engineering Structures

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The main goal of the work herein presented is to propose an accurate three-dimensional finite element model to predict the compressive behaviour of hybrid FRP-confined concrete. This was achieved through the modification of the concrete damaged plasticity model (CDPM) available in ABAQUS software, since the original CDPM has shortcomings that make it unusable to predict the compressive behaviour of confined concrete. It was demonstrated that, by turning the yield function and the flow rule dependents on the confining pressure, it is possible to use the model referred to and obtain accurate results. An analytical model was used to obtain the input parameters needed to calibrate the CDPM. A specific user subroutine was developed to modify the original CDPM. Hybrid FRP properties were calibrated as well, using an appropriate analytical model. Plasticity was assumed in the hybrid combinations for which pseudo-ductile tensile responses occurred. The performance of the proposed CDPM was validated using both experimental results and analytical predictions. It was concluded that, by using the developed 3D finite element model for hybrid FRP-confined concrete in compression, a very good agreement between experimental, analytical and numerical compressive stress-strain and lateral strain-axial strain curves is reached.

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Models for predicting elastic modulus and tensile strength of carbon, basalt and hybrid carbon-basalt FRP laminates at elevated temperatures

Cited by 65 publications

References 22 publications

Durability of Epoxy Adhesives and Carbon Fibre Reinforced Polymer Laminates Used in Strengthening Systems: Accelerated Ageing versus Natural Ageing

Durability of Epoxy Adhesives and Carbon Fibre Reinforced Polymer Laminates Used in Strengthening Systems: Accelerated Ageing versus Natural Ageing

Hybrid Composites of Polylactide with Basalt and Carbon Fibers and Their Thermal Treatment

3D finite element model for hybrid FRP-confined concrete in compression using modified CDPM

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