Influence of moderate/high temperatures on the residual flexural behavior of pultruded GFRP

P.S.C., Vieira,; Souza, F.J. de; Cardoso, Daniel C.T.; Vieira, Janine Domingos; Silva, Flávio de Andrade

doi:10.1016/j.compositesb.2020.108335

Cited by 16 publications

(2 citation statements)

References 34 publications

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“…Analysis of the DTG curve reveals that there is a less obvious weight loss peak around 130 °C, which may be related to water It can be noted that the TGA-DTG curves of different aging times almost overlap, and the curves of the two environments also show great similarity, indicating that the aging time and salt solution environment cause no obvious changes in the thermal stability of the adhesive. In the thermogravimetric curve, the weight of the samples all showed a "steplike" decline, and the main weight loss interval was in the range of 240-500 • C, which is due to the polymer properties of the adhesive [65]. In this temperature range, materials are pyrolyzed, releasing compounds such as carbon dioxide, isocyanate, ammonia, cyanogen hydroxide, and carbon monoxide.…”

Section: Tga-dtg Testmentioning

confidence: 99%

Durability of Two Epoxy Adhesive BFRP Joints Dipped in Seawater under High Temperature Environment

Niu,

Yang,

Liu

et al. 2023

Polymers

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Fiber-reinforced polymers (FRPs) have great potential in shipbuilding. As a new type of material, basalt-fiber-reinforced polymer (BFRP) has received increasing attention due to its good economic and environmental performance. In this paper, BFRP single-lap joints (SLJs) bonded by Araldite®2011 and Araldite®2014 were selected as sample objects, the joints, aged for 240 h, 480 h, and 720 h, were experimentally analyzed in 3.5% NaCl solution/5% NaCl solution at 80 °C. The sequential dual Fickian (SDF) model was used to fit the water absorption process of the dumbbell specimen material. By comparison, the water absorption of the material occurred mainly on the adhesive and the water absorption of Araldite®2011 was higher than that of Araldite®2014. The decrease in the Tg of the aged joint adhesive was characterized by DSC, and the TG test showed that the polymer material in the joint was degraded by the damp–heat effect. The quasi-static tensile test showed that the decrease in joint failure strength was positively correlated with the water content of the solution. The Araldite®2011 adhesive joint showed better mechanical properties and stability than the Araldite®2014 adhesive joint, while the secondary crosslinking of the bound water with the polymer chain resulted in a slight increase in the stiffness of the aged joint. From comprehensive observation of the macro-section and SEM-EDX images, it is concluded that the failure mode of the joint changes from fiber tearing to mixed failure of fiber tearing and adhesive layer cohesion, and the plasticizing effect of the epoxy resin in the adhesive and chemical corrosion of salt ions weakens the adhesive layer’s bond strength.

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Section: Tga-dtg Testmentioning

confidence: 99%

Durability of Two Epoxy Adhesive BFRP Joints Dipped in Seawater under High Temperature Environment

Niu,

Yang,

Liu

et al. 2023

Polymers

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“…The last decades have been marked by the significant growth of composites application within the engineering community due to their superior properties over traditional construction materials (timber, concrete, steel) [1][2][3][4].…”

Section: Intr Introduction Oductionmentioning

confidence: 99%

Analysis of Spring-in Deformation in L-shaped Profiles Pultruded at Different Pulling Speeds: Mathematical Simulation and Experimental Results

Vedernikov¹,

Safonov²,

Tucci³

et al. 2021

Esaform 2021

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Peculiarities of the pultrusion manufacturing process lead to the occurrence of spring-in deformations, whereas their value depends on the pulling speed. In this article experimental and numerical analysis was carried out for glass fiber/vinyl ester resin 75 × 75 × 6 mm L-shaped profiles pultruded at pulling speeds of 200 and 600 mm/min. Spring-in angles of produced profiles were determined on the same day of manufacturing when profiles cooled down to room temperature. Higher pulling speeds provoked increased values of spring-in. 2D numerical model accounting for thermo-chemical and mechanical composite’s behavior during pultrusion was implemented in ABAQUS software. Cure Hardening Instantaneous Linear Elastic (CHILE) constitutive law was used to describe matrix resin Young’s modulus evolution. Since both unidirectional (UD) rovings and fabric material were utilized, effective mechanical properties of UD and fabric layers were calculated in accordance with Self-Consistent Field Micromechanics (SCFM) approach. Spring-in angles determined within experimental and numerical studies were compared and a good correlation was found: the errors were 12.6% and 6% for the pulling speed of 200 and 600 mm/min, respectively.

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Effects of thermal aging on damage evolution behavior of glass fiber reinforced composites with multilayer graphene by acoustic emission

Wang

Zhou

Guo

et al. 2022

J of Applied Polymer Sci

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The thermal aging behavior of glass fiber reinforced composites has attracted much attention because of its application in elevated temperatures environments. In this study, to improve the thermal aging resistance performance of composites, multilayer graphene was embedded in glass fiber reinforced composites and the damage evolution behaviors of the composites after thermal aging treatments were investigated. The mapping relationship between damage modes and acoustic emission parameters is established by principal component analysis and k-means clustering methods, then the acoustic emission data were trained by K-Nearest Neighbor algorithms to obtain a damage modes identification model with positive predictive values above 90%. The results showed that more matrix cracking signals are captured (or matrix cracking accumulation acoustic emission (AE) energy is abruptly raised) at the early stage of loading after 32 days of thermal aging. With the addition of multilayer graphene, the fiber/matrix debonding accumulation AE energy is significantly less than the matrix cracking accumulation AE energy, which is more obvious after thermal aging. Damage initiation and extension obtained by the acoustic emission events help to find the correlation between aging time and interior interface damage mechanism.

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Influence of moderate/high temperatures on the residual flexural behavior of pultruded GFRP

Cited by 16 publications

References 34 publications

Durability of Two Epoxy Adhesive BFRP Joints Dipped in Seawater under High Temperature Environment

Durability of Two Epoxy Adhesive BFRP Joints Dipped in Seawater under High Temperature Environment

Analysis of Spring-in Deformation in L-shaped Profiles Pultruded at Different Pulling Speeds: Mathematical Simulation and Experimental Results

Effects of thermal aging on damage evolution behavior of glass fiber reinforced composites with multilayer graphene by acoustic emission

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