Relationship between Barcol hardness and flexural modulus degradation of composite sheets subjected to flexural fatigue

Sakin, Raif

doi:10.12989/scs.2015.19.6.1531

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…It was observed that similar fatigue formation stages were obtained in other studies on the fatigue behavior of fiber-reinforced composite materials. 34,36,37 In the performed fatigue tests, there was no fatigue fracture damage was observed for the carbon/epoxy laminated composites in 10 6 cycles.…”

Section: Flexural Fatigue Test Resultsmentioning

confidence: 93%

Effects of hostile solutions on the static and dynamic behavior of carbon/epoxy composites

Balcıoğlu

Sakin

Gün

2021

Journal of Composite Materials

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Fiber-reinforced laminated composite is often used in harsh environments that may affect their static stability and long-term durability as well as residual strength. In this study, the effect of heavy chemical environments such as acid and alkaline and retaining time for these environments on flexural strength and flexural fatigue behavior of carbon/epoxy laminated composites were investigated. In this context, carbon/epoxy was retained into an acidic and alkaline solution having 5%, 15%, and 25% concentration by weight for 1–4 months. Fatigue behavior of carbon/epoxy was determined under dynamic flexural load, which corresponds to 80%, 70%, 60%, 50%, and 40% of static three-point bending strength of the test sample. SEM image of damaged specimens was taken to describe the failure mechanism of damage which occurs after fatigue. Also, to better understand environmental condition on the fatigue life, results were compared with results of carbon/epoxy laminated composites, which were not retained into any environments (unretained). The test results showed that the solution type, solution concentration, and retaining time caused noticeable changes in the static and dynamic strengths of carbon/epoxy laminated composites.

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Section: Flexural Fatigue Test Resultsmentioning

confidence: 93%

Effects of hostile solutions on the static and dynamic behavior of carbon/epoxy composites

Balcıoğlu

Sakin

Gün

2021

Journal of Composite Materials

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“…In some sources in the literature, the relationship between the hardness and strength of composite materials has been investigated [39,40], and the formula S = k.H has been mentioned [41]. Where S represents strength, k is the coefficient, and H is the hardness value.…”

Section: Relationship Between Tensile Strength and Hardnessmentioning

confidence: 99%

Tensile behaviour of continuous carbon fibre reinforced composites fabricated by a modified 3D printer

Gür,

Çelik,

Sakin

2024

Mater. Res. Express

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This study aims to highlight the impact of low-volume (7.5%) continuous carbon fibre reinforcement in three different polymer matrices and the effects of post-processing under hot pressing on the mechanical properties of the structures. A fused deposition modelling (FDM) printer's print head was modified to directly extrude the polymer matrix and continuous carbon fibre tow together. Both pure and carbon fibre-reinforced samples were cured under hot pressing at 100°C and 10 kN pressure for 15 minutes. All samples underwent tensile and hardness tests, and the microstructure of fractured samples was analysed using a scanning electron microscope. The results indicate that continuous carbon fibre reinforcement and hot pressing are crucial for enhancing the mechanical performance of 3D-printed objects.

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“…The carbon fiber and glass fiber without Gelcoat show the highest values. This is due to the mechanical properties of the Gelcoat [26], which means that the hardness is lower for samples with Gelcoat [27]. Table 1 shows the average data of roughness and hardness for the materials before the water jet erosion tests.…”

Section: Roughness and Hardnessmentioning

confidence: 99%

Water Jet Erosion Performance of Carbon Fiber and Glass Fiber Reinforced Polymers

et al. 2021

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Complex engineering challenges are revealed in the wind industry; one of them is erosion at the leading edge of wind turbine blades. Water jet erosive wear tests on carbon-fiber reinforced polymer (CFRP) and glass-fiber reinforced polymer (GFRP) were performed in order to determine their resistance at the conditions tested. Vacuum Infusion Process (VIP) was used to obtain the composite materials. Eight layers of bidirectional carbon fabric (0/90°) and nine glass layers of bidirectional glass cloth were used to manufacture the plates. A water injection platform was utilized. The liquid was projected with a pressure of 150 bar on the surface of the specimens through a nozzle. The samples were located at 65 mm from the nozzle at an impact angle of 75°, with an exposure time of 10, 20 and 30 min. SEM and optical microscopy were used to observe the damage on surfaces. A 3D optical profilometer helped to determine the roughness and see the scar profiles. The results showed that the volume loss for glass fiber and carbon fiber were 10 and 19 mm3, respectively. This means that the resistance to water jet erosion in uncoated glass fiber was approximately two times lower than uncoated carbon fiber.

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Relationship between Barcol hardness and flexural modulus degradation of composite sheets subjected to flexural fatigue

Cited by 5 publications

References 27 publications

Effects of hostile solutions on the static and dynamic behavior of carbon/epoxy composites

Effects of hostile solutions on the static and dynamic behavior of carbon/epoxy composites

Tensile behaviour of continuous carbon fibre reinforced composites fabricated by a modified 3D printer

Water Jet Erosion Performance of Carbon Fiber and Glass Fiber Reinforced Polymers

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