Shear Behavior of GFRP Composite Materials at Elevated Temperature

Rosa, Inês C.; Morgado, Tânia; Correia, João R.; Firmo, João P.; Silvestre, Nuno

doi:10.1061/(asce)cc.1943-5614.0000839

Cited by 18 publications

(4 citation statements)

References 14 publications

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“…However, it is worth noting that the decline of properties is at a constant degree with respect to temperature. This condition is very similar to the one reported by Rosa et al [11] where the shear strength and modulus of their GFRP are also severely low (less than 30%) when nearing Tg. For in-plane shear tests, the specimen does not fail and therefore there is no failure mode since the samples are not in pure in-plane shear stress according to the ASTM [20].…”

Section: Tensile Testsupporting

confidence: 89%

“…Their results indicate interlaminar shear strength is enhanced with a hybrid of carbon and glass fibres. The in-plane shear strength of GFRP was very recently analyzed by Rosa et al [11] where they found significant degradation with respect to temperature. Ou and Zhu [12] also tested on GFRP properties, with different strain rates and temperatures ranging from -25°C to 100°C.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Mechanical Properties of Glass Fiber Reinforced Epoxy at Elevated Temperature

Chow

Ahmad

Wong

2019

IJAME

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This paper presents the effects of elevated temperature on the mechanical response of a glass fibre reinforced epoxy (GFRE) composite. The mechanical properties taken into account are tensile, compression and shear. All tests are carried out at temperatures of 30°C, 70°C and 110°C, below the glass transition temperature of the resin. The properties along fibre direction and perpendicular to fibre direction are investigated, with two sets consisting of 0° and 90° fibre direction for tensile and compression tests. Stress-strain profiles at each temperature are firstly compared. Subsequently, the elastic modulus and the ultimate strength with respect to temperature are assessed. The results indicate that tensile properties remain relatively unaffected at 70°C but drop rapidly at 110°C. In addition, compressive properties decrease steadily from 30°C to 110°C, while shear properties are heavily degraded with increasing temperature. Fibre dominated properties have better heat resistance compared to matrix dominated properties due to matrix softening and weakening.

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Section: Tensile Testsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties of Glass Fiber Reinforced Epoxy at Elevated Temperature

Chow

Ahmad

Wong

2019

IJAME

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“…One main limitation of pultruded Glass Fiber Reinforced Polymer (GFRP) profiles in building and bridge structures is their poor performance when exposed to fire Wong, Davies, and Wang (2004); Rosa et al (2018Rosa et al ( , 2019. The authors of this paper nevertheless believe that there should be some rules or standards for its design, as is indeed the case of other structural materials.…”

Section: Introductionmentioning

confidence: 94%

Methodology for the elaboration of the design table of GFRP structures subjected to fire

García

Zubizarreta

Garmendia

2021

Mechanics of Advanced Materials and Structures

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The main objective of this study is to establish a fire protection design method for pultruded Glass Fiber Reinforced Polymer (GFRP) structures exposed to fire. The method is based on the development of tables similar to those already available for steel structures. The structural designer may use these tables to determine the minimum required thickness (of any type of insulation), so that the structure maintains its mechanical properties above the over-dimensioning coefficient. The method used to draw up these tables follows four steps; i) First, the limit temperatures are determined or the temperature ranges within which the application of pultruded GFRP is permitted; ii) Second, the behavior of certain physical properties (density, specific heat, thermal conductivity, emissivity...) are defined as a function of the temperature; iii) Third, the method to determine the fire resistance temperature of the pultruded profile sections is defined; iv) Finally, the mechanical properties and ultimate resistance values of these profiles at different temperatures are also estimated. The behavior of the mechanical properties is analyzed as a function of the massivity of each section and the ratio between the thermal conductivity of the insulation and its thickness. In addition, a practical example is given of the application of the tables to a pultruded GFRP structure.

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“…Thermoplastic preform must be heated over the matrix melting temperature to render the textile reinforcement deformation possible. Compared to the large amount of works on the in-plane shear behavior identified in the dry-state at room temperature [ 14 , 15 , 16 , 17 , 18 , 19 ], the characterization at elevated temperature [ 5 , 8 , 20 , 21 , 22 , 23 ] is difficult but essential. Most experimental and computational work has been done on 2D-woven preform, non-crimp fabrics [ 24 , 25 , 26 ], 3D-woven interlock preform [ 27 , 28 , 29 ], or 3D-woven tufting preform [ 30 ]; while the study of the in-plane shear behavior of braided preform is limited.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Unit Cell Parameters on the Thermomechanical Non-Symmetric In-Plane Shear Behavior of 2D Biaxial Braided Preform for Thermoplastic Biocomposites

et al. 2022

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The identification of thermomechanical in-plane shear behavior of preform is one of the most important factors to ensure the quality of the thermoplastic composites during the thermoforming process. In this present work, the non-symmetric in-plane shear behavior of flax/polypropylene 2D biaxial braided preform for thermoplastic biocomposites was characterized at elevated temperature chamber by using bias-extension test. Analytical models of a bias-extension test based on non-symmetric unit cell geometry for 2D biaxial braids were defined and applied; the thermo-condition-dependent experiments were conducted to study the temperature and displacement rate dependences. The influence of unit cell geometry parameters including braiding angle, tow waviness, and cover factor on the thermal in-plane shear behavior was deeply invested, experiments in both axial and transversal directions were performed for a complete study, and asymmetric scissor mechanisms for in-plane shear behavior were introduced and studied. Finally, a simulation of thermal impregnation distribution based on unit cell geometry was made to clarify the importance of the overall fiber volume fraction.

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Shear Behavior of GFRP Composite Materials at Elevated Temperature

Cited by 18 publications

References 14 publications

Experimental Study on the Mechanical Properties of Glass Fiber Reinforced Epoxy at Elevated Temperature

Experimental Study on the Mechanical Properties of Glass Fiber Reinforced Epoxy at Elevated Temperature

Methodology for the elaboration of the design table of GFRP structures subjected to fire

Influence of the Unit Cell Parameters on the Thermomechanical Non-Symmetric In-Plane Shear Behavior of 2D Biaxial Braided Preform for Thermoplastic Biocomposites

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