A Study on Compressive Strength of Carbon/epoxy Composite Structure Repaired with Bonded Patches after Impact Damage

Kong, Changduk; Park, Hyunbum; Lim, Sung-Jin; Shin, Chul-Jin

doi:10.7234/kscm.2010.23.5.015

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…In recent years, the research on composites materials and the industrial applications has rapidly expanded with the aim of decreasing the energy consumption and the development of new materials with lightweight characteristic. Among them, carbon fiber-reinforced plastics (CFRPs) have been used in several industries that require weight reduction, due to their higher specific strength, higher specific stiffness, low density, their excellent chemical resistance, and electrical properties when compared with existing metallic materials [ 1 , 2 , 3 ]. The CFRPs are the composites where the carbon fibers are used as strengthening elements to provide high strength in polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation

Go¹,

Tugirumubano

Kim

2021

Polymers

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With the increasing use of carbon fiber reinforced plastics in various fields, carbon fiber composites based on prepregs have attracted attention in industries and academia research. However, prepreg manufacturing processes are costly, and the strength of structures varies depending on the orientation and defects (pores and delamination). For the non-contact evaluation of internal defects, the lock-in infrared thermography was proposed to investigate the defects in the composites subjected to the compression after impact test (CAI). The drop-weight impact test was conducted to study the impact behavior of the composites according to fibers orientation for composite fabricated using unidirectional (UD) carbon fiber prepregs. Using CAI tests, the residual compressive strengths were determined, and the damage modes were detected using a thermal camera. The results of the drop weight impact tests showed that the specimen laminated at 0° suffered the largest damage because of susceptibility of the resin to impact. The specimens with 0°/90° and +45°/−45° fibers orientation exhibited more than 90% of the impact energy absorption and good impact resistance. Furthermore, the specimens that underwent the impact tests were subjected to compressive test simultaneously with the lock-in thermography defects detection. The results showed that internal delamination, fibers splitting, and broken fibers occurred. The temperature differences in the residual compression tests were not significant.

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Section: Introductionmentioning

confidence: 99%

Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation

Go¹,

Tugirumubano

Kim

2021

Polymers

View full text Add to dashboard Cite

show abstract

“…In recent years, the research on composites materials and the industrial applications has rapidly expanded with the aim of decreasing the energy consumption and the development of new materials with lightweight characteristic. Among them, carbon fiber-reinforced plastics (CFRPs) have been used in several industries that require weight reduction, due to their higher specific strength, higher specific stiffness, low density, their excellent chemical resistance, and electrical properties when compared with existing metallic materials [1][2][3]. The CFRPs are the composites where the carbon fibers are used as strengthening elements to provide high strength in polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation

Go¹,

Tugirumubano²,

Kim³

2020

Preprint

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.With the increasing use of carbon fiber reinforced plastics in various area, carbon fiber composites based on prepregs have attracted attention in industries and academia research. However, prepreg manufacturing processes are costly, and the strength of structures varies depending on the orientation and defects (pores and delamination). For non-contact evaluation of internal defects, we proposed lock-in infrared thermography to investigate orientation angles after a compression test. We also conducted a drop-weight impact test to study the behaviour of the composites after impact according the fibers orientation for composite fabricated using unidirectional carbon fiber prepregs. Using CAI tests, we determined the residual compressive strength and confirmed the damage modes using a thermal camera. The results of the drop weight impact tests show that the specimen laminated at 0° suffered the largest damage because of susceptibility of the resin to impact. In contrast, the specimens oriented in of 0°/90° and +45°/–45° directions transferred more than 90% of the impact energy back to the impactor because of the lamination of fibers in the orthogonal directions. Furthermore, the specimens that underwent complete damage in the impact tests were subjected to the lock-in method and showed internal delamination and cut fibers. With the finite elements analysis, the damage of each ply could be observed. Moreover, the temperature differences in the residual compression tests were not significant.

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“…, 면내응력이 존재하는 복합재 적층판의 충격거동 및 손상을 해석하기 위한 연구 [3], 샌드위치 복합재 구조의 충격손상 거동을 예측하기 위한 수치해석 및 시험결과 비 교를 수행한 연구 [4], 충격손상의 수리 및 유지보수를 위한 시험 및 해석적 연구 [5], 복합재 구조물의 충격 후 압축강 도 해석에 관한 연구 [6,7] …”

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Test and Finite Element Analysis on Compression after Impact Strength for Laminated Composite Structures of Unidirectional CFRP

Ha¹

2016

Composites Research

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ABSTRACT:In this study, tests and finite element analyses were performed regarding compression after impact strength for laminated composite structures of unidirectional carbon fiber reinforced plastic widely used in structural materials. Two lay-up sequences of composite laminates were selected as test specimens and four impact energy conditions were applied respectively. Impact and compressive strength tests were conducted in accordance with ASTM standards. Impact damages in test specimens were analyzed by using non-destructive inspection method of C-Scan, and compression after impact strengths were calculated with compressive test results. Progressive failure analysis method that can progressively simulate damages and fractures of fiber/matrix/lamina/laminate level was used for impact and compressive strength analyses. All analysis results including contact force, deflection, impact damages, compressive strengths, etc. were compared to test results, and the validity of analysis method was verified.

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A Study on Compressive Strength of Carbon/epoxy Composite Structure Repaired with Bonded Patches after Impact Damage

Cited by 6 publications

References 6 publications

Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation

Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation

Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation

Test and Finite Element Analysis on Compression after Impact Strength for Laminated Composite Structures of Unidirectional CFRP

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