Formability of CFRTP prepreg considering heat transfer

Lee, Jeong Min; Kim, Byung-Min; Min, Byeong-Jin; Park, Joon-Hong; Ko, Dae-Cheol

doi:10.1007/s40684-017-0020-3

Cited by 12 publications

(6 citation statements)

References 14 publications

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“…In addition, the interfacial heat transfer coefficients of the CFRP and mold were employed to predict the heat loss of the composite laminate. The heat transfer coefficients were determined as 59 W/m 2 • • C, 65 W/m 2 • • C, and 72 W/m 2 • • C for 2.0 MPa, 3.5 MPa, and 5.0 MPa, respectively [19]. Figure 5 shows the minimum temperature history of the CFRP laminates during the forming process.…”

Section: Process Design Of Stamping Process By Fe Forming Simulationmentioning

confidence: 99%

Spring-In Prediction of CFRP Part Using Coupled Analysis of Forming and Cooling Processes in Stamping

Ryu,

Lee,

Jang

et al. 2024

Materials

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The spring-in phenomenon of the composite parts can affect the assembly process. This study aims to predict the spring-in phenomenon of a carbon fiber reinforced plastic (CFRP) part. Here, we predict the spring-in of the CFRP part using a coupled analysis of the forming and cooling processes during the stamping process. First, a simulation of the entire forming process, such as the transfer of the composite laminate, gravity analysis, and forming was performed to obtain the temperature distribution of the CFRP part. Subsequently, a finite-element (FE) simulation of the cooling process was conducted to predict the spring-in phenomenon of the shaped CFRP part using the temperature data obtained in the forming simulation. Finally, a CFRP part was manufactured and compared with the results of the FE simulation.

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Section: Process Design Of Stamping Process By Fe Forming Simulationmentioning

confidence: 99%

Spring-In Prediction of CFRP Part Using Coupled Analysis of Forming and Cooling Processes in Stamping

Ryu,

Lee,

Jang

et al. 2024

Materials

Self Cite

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“…However, the test results of bending deformation of both products were obviously reduced compared to the structural analysis. To assess this reason, forming analysis was performed in the same way as the manufacturing process using the mechanical properties of a previous study [26].…”

Section: Verification Of Cfrp B-pillar Reinforcementmentioning

confidence: 99%

Design of Lightweight CFRP Automotive Part as an Alternative for Steel Part by Thickness and Lay-Up Optimization

et al. 2019

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Mechanical properties, such as strength and stiffness, of laminated carbon fiber reinforced plastic (CFRP) are generally affected by the lay-up method. However, no precise design rules to replace steel products with CFRP have been established that satisfy these properties. Therefore, this study proposes a set of rules to design automotive parts with equivalent bending stiffness through structural analysis and genetic algorithms (GAs). First, the thickness of the CFRP product was determined by comparing the bending deformation of steel products by structural analysis. To minimize the orthotropic characteristics of CFRP, the quasi-isotropic lay-up method was implemented to determine the thickness. Next, the lay-up angle was determined using GAs. The optimized lay-up angle of the CFRP product with minimum bending deformation was determined by population generation, cross-over, mutation, and fitness evaluation. CFRP B-pillar reinforcement was fabricated using the determined conditions and the bending deformation of the single component was evaluated. Finally, the B-pillar assembled with CFRP reinforcement was investigated by the drop tower test.

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“…However, thermoplastic resins have a weakness in terms of low processability due to their high melting temperature, high glass transition temperature, and high viscosity. [6][7][8] To overcome these issues, researchers have studied thermoplastic resin transfer molding (T-RTM). 9 T-RTM utilizes anionic ring-opening polymerization of ε-caprolactam (CPL), which is a monomer of A-PA6.…”

Section: Introductionmentioning

confidence: 99%

“…In the context of global sustainability trends, the manufacturing process of composites has been studied using thermoplastic resins due to their recyclability advantage over thermoset resins. However, thermoplastic resins have a weakness in terms of low processability due to their high melting temperature, high glass transition temperature, and high viscosity 6–8 . To overcome these issues, researchers have studied thermoplastic resin transfer molding (T‐RTM) 9 …”

Section: Introductionmentioning

confidence: 99%

Development of single‐stream resin transfer molding using in‐situ anionic polymerization of ε‐caprolactam with preprocessing on carbon fibers

Shim,

Park

2024

Polymer Composites

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Thermoplastic resin transfer molding (T‐RTM) is one of the composites manufacturing processes using anionic ring‐opening polymerization of ε‐caprolactam (CPL). Because of very fast reaction among materials, traditional T‐RTM requires two different channels before transferring resin into the mold cavity. Single‐stream method has been researched for robust and simple process, which has several advantages in aspect of manufacturing process. Carbon fibers were preprocessed including polyamide sizing, plasma treatment and activator sizing for modified single‐channel T‐RTM. Through quantitative calculation of required sizing content, concentration of sizing agent was controlled. Thermal stability of preprocessed carbon fibers during molding was measured by TGA. Crystallinity of anionic‐polyamide 6 (A‐PA6) manufactured by single‐stream T‐RTM was measured by DSC and 3.0% lower than traditional T‐RTM. Mechanical properties were measured, which are short‐beam strength and flexural strength/modulus. The short‐beam strength and flexural strength of the composites fabricated through single‐stream T‐RTM were 29.7% and 17.0% higher than those fabricated through conventional T‐RTM while strain and toughness decreased. Fracture surface of carbon fibers/A‐PA6 composites manufactured by single‐stream T‐RTM showed more adhesive bonding between carbon fiber and matrix.Highlights Surface treatment on carbon fibers to develop single‐channel T‐RTM process. Effects of surface treatment researched by thermal, quantitative, and IR analysis. Improved interfacial fracture mechanisms due to higher adhesion at the interface.

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Formability of CFRTP prepreg considering heat transfer

Cited by 12 publications

References 14 publications

Spring-In Prediction of CFRP Part Using Coupled Analysis of Forming and Cooling Processes in Stamping

Spring-In Prediction of CFRP Part Using Coupled Analysis of Forming and Cooling Processes in Stamping

Design of Lightweight CFRP Automotive Part as an Alternative for Steel Part by Thickness and Lay-Up Optimization

Development of single‐stream resin transfer molding using in‐situ anionic polymerization of ε‐caprolactam with preprocessing on carbon fibers

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