Mechanical and Thermal Properties of Carbon/Basalt Intra-ply Hybrid Composites. I. Effect of Intra-ply Hybridization

Farzin Azimpour-Shishevan,Hamit Akbulut,M. A. Mohtadi-Bonab 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11

The effects of intra-ply hybridization on mechanical and thermal properties of carbon/basalt fibers reinforcedepoxy composites were experimentally investigated. Combination of superior mechanical properties of carbon fiber, goodthermal stability and basalt fiber toughness is the main purpose of designing of these composites. Three types ofhomogeneous carbon fiber reinforced polymer (CFRP), basalt fiber reinforced polymer (BFRP) and intra-ply hybrid ofcarbon/basalt reinforced polymer (CBFRP) composites were fabricated by using vacuum assisted resin infusion molding(VARIM) method. All fabricated composite plates were cut according to ASTM standard. The effect of incorporation ofbasalt fiber with carbon fiber on mechanical properties, such as modulus of elasticity, tensile strength, flexural modulus,flexural strength and inter laminar shear strength (ILSS) were studied by bending, tensile and short beam shear (SBS)experiments. Measurement of thermal conductivity, dynamic mechanic analyze (DMA), thermogravimetric analyze (TGA)tests were also carried out for thermal characterization of fabricated homogeneous and hybrid composites. Furthermore,dynamic drop test (DDT) was used to evaluate hybridization effect on hydrophobicity of composites. The results indicatedthat the CBFP hybrid composites perform a moderate mechanical performance between homogeneous CFRP and BFRPcomposites. On the other hand, incorporation of basalt fiber in the structure of carbon fiber composite not only enhances thethermal stability of composites but also moderates the fabrication price by alternating cheaper basalt fiber with expensivecarbon fiber.

현무암 섬유 보강 폴리우레탄폼의 열적 성능 및 극저온 환경에서의 기계적 특성 평가

전성규,김정대,김희태,김정현,김슬기,이제명 대한조선학회 2022 大韓造船學會 論文集 Vol.59 No.4

LNG CCS which is a special type of cargo hold operated at –163℃ for transporting liquefied LNG is composed of a primary barrier, plywood, insulation panel, secondary barrier, and mastic. Currently, glass fiber is used to reinforce polyurethane foam. In this paper, we evaluated the possibility of replacing glass fiber-reinforced polyurethane foam with basalt fiber-reinforced polyurethane foam. We conducted a thermal conductivity test to confirm thermal performance at room temperature. To evaluate the mechanical properties between basalt and glass-fiber-reinforced polyurethane foam which is fiber content of 5 wt% and 10 wt%, tensile and an impact test was performed repeatedly. All of the tests were performed at room temperature and cryogenic temperature(-163℃) in consideration of the temperature gradient in the LNG CCS. As a result of the thermal conductivity test, the insulating performance of glass fiber reinforced polyurethane foam and basalt fiber reinforced polyurethane foam presented similar results. The tensile test results represent that the strength of basalt fiber-reinforced polyurethane foam is superior to glass fiber at room temperature, and there is a clear difference. However, the strength is similar to each other at cryogenic temperatures. In the impact test, the strength of PUR-B5 is the highest, but in common, the strength decreases as the weight ratio of the two fibers increases. In conclusion, basalt fiber-reinforced polyurethane foam has sufficient potential to replace glass fiber-reinforced polyurethane foam.

현무암섬유 섬유 배향에 따른 현무암섬유 강화 복합재료의 기계적 계면특성 영향

김명석(Myung-Seok Kim),박수진(Soo-Jin Park) 한국고분자학회 2015 폴리머 Vol.39 No.2

본 연구에서는 현무암섬유의 계면을 황산과 과산화수소로 처리하고 섬유 배향각을 0°, 0°/90°, 0°/45°/-45°로 달리하여 현무암섬유 에폭시 강화 복합재료의 기계적 특성에 미치는 영향에 대해서 살펴보았다. 기계적 특성은 층간전단강도(ILSS)와 파괴인성 요소 중 임계응력세기인자(KIC) 측정을 통하여 고찰하였으며, 섬유의 표면미세구조 변화와 복합재료의 파단면은 주사전자현미경(SEM)으로 관찰하였다. 또한 섬유표면에 계면처리의 여부를 확인하기 위하여 적외선 분광법(FTIR)과 X-선 광전자 분광법(XPS)을 분석하였다. 실험결과 계면처리한 섬유 표면의 -OH 기(hydroxyl)가 증가됨을 확인하였다. 계면처리한 후의 기계적 특성이 계면처리 전의 기계적 특성보다 약 ~100% 증가하였다. 이러한 결과는 표면처리에 의해 섬유와 에폭시 수지 매트릭스 사이의 계면결합력을 증가시킨 것으로 판단된다. In this work, the effect of fiber array direction including 0°, 0°/90°, 0°/45°/-45° was investigated for mechanical properties of basalt fiber-reinforced composites. Mechanical properties of the composites were studied using interlaminar shear strength (ILSS) and critical stress intensity factor (KIC) measurements. The cross-section morphologies of basalt fiber-reinforced epoxy composites were observed by scanning electron microscope (SEM). Also, the surface properties of basalt fibers were determined by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). From the results, it was observed that acid treated basalt fiber-reinforced composites showed significantly higher mechanical interfacial properties than those of untreated basalt fiber-reinforced composites. These results indicated that the hydroxyl functional groups of basalt fibers lead to the improvement of the mechanical interfacial properties of basalt fibers/epoxy composites in the all array direction.

Influence of aicd and base treatment on mechanical interfacial properties of basalt fiber/epoxy composites

성동범,박수진 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

In this work, the effect of acid and base treated fiber was investigated for mechanical properties of basalt fiber-reinforced composites. Mechanical properties were studied using interlaminar shear strength (ILSS) and critical stress intensity factor (KIC) measurements. The crosssection morphologies of basalt fiber-reinforced epoxy composites were observed by scanning electron microscope (SEM), also the surface properties of basalt fibers were determined by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results, it was observed that acid and base treated basalt fiber-reinforced composites showed Contrary mechanical interfacial properties than those of untreated basalt fiber-reinforced composites. These results indicated that the functional groups of basalt fibers lead to the improvement of the mechanical interfacial properties of basalt fibers/epoxy composites.

Effect of nickel-plated on thermal and mechanical properties of basalt fiber-reinforced composites

김성황,박수진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0

This study, nickel plated basalt fiber-reinforced epoxy composites were fabricated. Basalt fibers were treated by acid and electroless nickel plating was applied on the treated basalt fibers. Thermal and mechanical properties of the prepared basalt fiber-reinforced epoxy composites were investigated according to plating time. The plating time controlled thickness of nickel on treating basalt fibers. FT-IR and XPS were used to invest effects of acid treatment and electroless nickel plating. The fracture toughness was calculated by the critical stress intensity factor (KIC). The morphology was observed by scanning electron microscope (SEM). A thermal weight analyzer (TGA) was used to invest thermal stability. The results show that nickel plating on basalt fibers affects thermal and mechanical properties of basalt fiber-reinforced epoxy composites.

Effect of Basalt Fiber on the Strength Properties of Polymer Reinforced Sand

Jin Liu,Yuxia Bai,Zezhuo Song,Ying Wang,Zhihao Chen,Qiongya Wang,Debi Prasanna Kanungo,Wei Qian 한국섬유공학회 2018 Fibers and polymers Vol.19 No.11

This paper displays an experimental study of the effect of basalt fiber on the strength properties of polymer reinforced sand. Laboratory trials of unconfined compression test (UCS), direct shear test, and tensile test were conducted on the specimens treated with polymer and basalt fiber, and several factors including polymer content, fiber content and dry density of sand that will influence the strength behaviors are investigated in detail. Based on test results and scanning electron microscope (SEM) images, the reinforcement mechanism was analyzed. The results showed that the polymer content, basalt fiber content and dry density of sand had greatly improved the strength behaviors of reinforced specimens. The increase in polymer and fiber content had an active effect on strength characteristics, while the angle of internal decreased slightly. The strength properties were enhanced with the increase in dry density, and the effect of dry density on tensile strength is affected by fiber content. The presence of randomly distributed fibers has formed a spatial fiber-sand net in sand, and the additive of polymer solution formed membrane to enwrap sand particles and connect sand and fibers, thereby formed a stable structure in sand. These structures have increased the bonding and interlocking forces between sand and fibers, and decreased the void ratio of reinforced specimens.

Mechanical Properties and Microstructure of Basalt Fiber Reinforced Concrete Under the Single-Side Salt-Freezing–Drying–Wetting Cycles

Hao Zeng,Jin Zhang,Yang Li,Xin Su,CongZhi Gu,Kai Zhang 한국콘크리트학회 2022 International Journal of Concrete Structures and M Vol.16 No.6

In the past, the salt freezing test does not often accord with the actual service environment of engineering, thus, we designed a test method of single-side salt-freezing–drying–wetting cycles. The mechanical properties and microstructure of ordinary concrete and basalt fiber reinforced concrete were studied. The mechanical property test is aimed at the splitting tensile strength and compressive strength of concrete after different cycles. The microstructure test is to study the hydration products by scanning electron microscope (SEM) and the pore structure of concrete by mercury intrusion porosimetry (MIP) test. The results indicate that the addition of basalt fiber can improve the compactness and pore structure of concrete. It is beneficial to enhance the durability of concrete under single-side salt-freezing–drying–wetting cycles. The improving effect of basalt fiber is better on the splitting tensile strength of concrete than the compressive strength. Basalt fiber exerts the best effect on reducing harmful holes in concrete. However, there is an optimal range of basalt fiber content, the performance of concrete will deteriorate with excessive fiber content. The cycles will destroy the hydration products of concrete and the synergistic effect between hydration products and fibers, but has little effect on the three-dimensional network constructed by basalt fibers. The pore structure of concrete is correlated with the mechanical properties of it under cyclic conditions, which is worth further study.

Preparation and characterization of nickel plated basalt fiber/epoxy composites

김익규,박수진 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

In this works, nickel plated basalt fiber/epoxy composites were fabricated. Basalt fibers were treated by acid and electroless nickel plating was applied on the treated basalt fiber. Mechanical properties, thermal properties and surface free energy of the prepared composites were investigated according to plating time. The plating time controlled thickness of nickel on threated basalt fiber. FT-IR and XPS were used to invest effects of acid treatment and electroless nickel plating. The fracture toughness was calculated by the critical stress intensity factor (KIC). The morphology was observed by scanning electron microscope (SEM). A thermal weight analyzer (TGA) was used to invest thermal stability. Surface free energy was measured using contact angle measurement of three liquid droplets. The results show that nickel plating on basalt fibers affects mechanical properties of basalt fiber/epoxy composites.

Dynamic Properties of Strain-Hardening Cementitious Composite Reinforced with Basalt and Steel Fibers

Na Zhang,Jian Zhou,Guo-wei Ma 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.4

Strain-hardening cementitious composites (SHCCs) reinforced with both basalt and steel fibers are expected to possess the advantages of both fiber materials and exhibit desirable mechanical properties. In this study, we experimentally investigated the dynamic mechanical properties of an SHCC reinforced with inorganic fibers of basalt and steel for different strain rates (10¹ to 10²s<SUP>−1</SUP>) using a 50-mm-diameter Split-Hopkinson pressure bar. The effects of the strain rate on the dynamic compressive strength and dynamic splitting strength as well as the dynamic increase factor and energy absorption characteristics of the SHCC were analyzed. The results showed that all the mechanical indices increased with an increase in the strain rate. The dynamic increase factors of the compressive strength and splitting strength increased linearly with the decimal logarithm of the strain rate. Further, the addition of the basalt and steel fibers resulted in a significant increase in the strain-rate sensitivity of the dynamic mechanical behavior of the SHCC, with the effect of the steel fibers being more pronounced than that of the basalt fibers. Although the basalt and steel fibers had varying effects on the strain-rate sensitivity of the dynamic mechanical behavior of the SHCC based on the fiber content, there were significant positive correlations between the type and content of the fibers used and the strain-rate sensitivity.

Correlation between Mechanical Properties and Surface Property Changes of Basalt Fibers-Reinforced Polypropylene Composites by Acid Treatment

최웅기,국윤수,김병석,서민강 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

Generally, the basalt fibers/polypropylene composites have incomplete mechanical properties because basalt fibers have poor interfacial adhesion with polypropylene due to their imperfect interface. Therefore, in this study, the acid treatment on basalt fiber surfaces was carried out for improvement of interfacial adhesion between the basalt fiber and the polypropylene matrix. And, the correlation between mechanical properties and surface property changes of basalt fibers-reinforced polypropylene composites was studied at mechanical and energetic point of view.