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

Go, Sun-Ho; Tugirumubano, Alexandre; Kim, Hong-Gun

doi:10.3390/polym13020203

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…In order to achieve the goal of energy saving and emission reduction in fuel vehicles, lightweight vehicles have become the trend in automotive development around the world. Carbon fiber-reinforced plastic (CFRP) has the advantages of being light weight, high strength, and corrosion resistant, and can improve the properties and performances of many industrial parts by replacing conventional metal-based materials [1,2]. Based on these advantages, CFRP has been widely used in the lightweight design of automobile parts.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Micro-Groove on the Surface of CFRP to Enhance the Connection Strength of Composite Part

Wei

et al. 2021

Polymers

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Carbon fiber-reinforced plastic (CFRP) has the advantages of being light weight, high strength, and corrosion resistant. At present, it is widely used in the lightweight design of automobile parts. The manufacturing of lightweight parts inevitably involves the connection between CFRP and the polymer material. The connection strength between CFRP and the polymer material significantly affects the service life of the composite parts. Taking CFRP and polyamide 6 (PA6) injection-molded composite parts as an example, this paper proposed a technological method to enhance the connection strength between CFRP and PA6. The proposed method was to fabricate micro-groove structures on the CFRP surface by compression molding. These micro-groove structures effectively increased the injection-molding area of the composite parts, thus enhancing the connection strength between CFRP and PA6. This paper presented a detailed study on the compression-molding process of micro-grooves on the CFRP surface, and successfully obtained the appropriate parameters. Finally, PA6 was used for injection molding on the CFRP with micro-grooves at an injection pressure of 8 MPa, an injection temperature of 240 °C, a holding pressure of 5 MPa, and a holding time of 2.5 s. The experimental results show that the micro-groove array structures on the CFRP surface could effectively improve the tensile strength of the connection interface in the composite parts. Compared with the composite part without micro-grooves, the tensile strength of the composite part with micro-grooves was increased by 80.93%. The composite parts prepared in this paper are mainly used in automobile interiors and the research results of this paper meet the actual needs of the enterprise.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Micro-Groove on the Surface of CFRP to Enhance the Connection Strength of Composite Part

Wei

et al. 2021

Polymers

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Experimental investigation on Compression-After-Impact (CAI) response of aerospace grade thermoset composites under low-temperature conditions assisted with acoustic emission monitoring

Seyyednourani

Akgun

Ulus

et al. 2023

Composite Structures

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Automated Foreign Object Detection for Carbon Fiber Laminates Using High-Resolution Ultrasound Testing

Nargis,

Pulipati,

Jack

2024

Materials

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Carbon fiber laminates have become popular in the manufacturing industry for their many desirable properties, like good vibration damping, high strength-to-weight ratio, toughness, high dimensional stability, and low coefficient of thermal expansion. During the manufacturing process, undesirable foreign objects, such as peel-ply strips, gloving material, and Kapton film, can be introduced into the part which can lead to a localized weakness. These manufacturing defects can function as stress concentration points and oftentimes cause a premature catastrophic failure. In this study, a method using high-resolution pulse-echo ultrasound testing is employed for the detection and quantification of the dimensions of foreign object debris (FOD) embedded within carbon fiber laminates. This research presents a method to create high-resolution C-scans using an out of immersion tank portable housing ultrasound scanning system, with similar capabilities to that of a full immersion system. From the full-waveform dataset, we extract the FOD depth and planar dimensions with an automatic edge detection technique. Results from several carbon fiber laminates are investigated with embedded foreign objects that are often considered undetectable. Results are presented for FOD identification for two different shapes: circles with diameters ranging from 7.62 mm to 12.7 mm, and 3-4-5 triangles with hypotenuses ranging from 7.6 mm to 12.7 mm. CT imaging is used to confirm proper FOD placement and that the FOD was not damaged or altered during manufacturing. Of importance for the ultrasound inspection results, in every single case studied, the FOD is detected, the layer depth is properly identified, and the typical error is less than 1.5 mm for the primary dimension.

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

Cited by 3 publications

References 20 publications

Fabrication of Micro-Groove on the Surface of CFRP to Enhance the Connection Strength of Composite Part

Fabrication of Micro-Groove on the Surface of CFRP to Enhance the Connection Strength of Composite Part

Experimental investigation on Compression-After-Impact (CAI) response of aerospace grade thermoset composites under low-temperature conditions assisted with acoustic emission monitoring

Automated Foreign Object Detection for Carbon Fiber Laminates Using High-Resolution Ultrasound Testing

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