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Novel Approach toward the Forming Process of CFRP Reinforcement with a Hot Stamped Part by Prepreg Compression
Jae-Hong Kim1, Yong-Hun Jung1, Francesco Lambiase2
1ERC for Innovative Technology on Advanced Forming, Pusan National University, Busan 46241, Korea.
Materials (Basel, Switzerland)
|July 27, 2022
Summary
This study introduces a new manufacturing method for steel/carbon fiber-reinforced plastic (CFRP) B-pillars using prepreg compression molding (PCM). This efficient process combines steel and CFRP without needing extra adhesives.
Area of Science:
- Materials Science
- Manufacturing Engineering
- Automotive Engineering
Background:
- Carbon fiber-reinforced plastics (CFRP) offer lightweight and high mechanical properties, driving their increased use in automotive manufacturing.
- Joining CFRP with traditional materials like steel presents challenges due to adhesive limitations.
- Prepreg compression molding (PCM) offers potential for reduced production times and increased manufacturing flexibility.
Purpose of the Study:
- To propose and validate a novel manufacturing process for creating steel/CFRP composite B-pillars.
- To investigate the integration of CFRP reinforcement onto hot-stamped steel components using PCM.
- To establish optimal temperature conditions for the combined steel and CFRP components during the PCM process.
Main Methods:
- Finite element (FE) simulation was used to predict B-pillar dimensions after hot stamping.
- Thermoforming simulations of CFRP on a shaped B-pillar assessed PCM feasibility.
- Heat transfer analysis determined compatible temperature conditions for steel and CFRP.
- Experimental PCM of a steel/CFRP B-pillar was conducted and compared with simulation results.
- Scanning electron microscopy (SEM) evaluated the cross-section and interlayer adhesion of the manufactured B-pillar.
Main Results:
- FE simulations accurately predicted B-pillar dimensions.
- PCM process feasibility for CFRP thermoforming on steel was confirmed through simulation.
- Optimal temperature parameters for heat transfer between steel and CFRP were identified.
- Successful manufacturing of a steel/CFRP B-pillar assembly was achieved using the proposed PCM method.
- SEM analysis verified the integrity of the B-pillar and its interlayers.
Conclusions:
- The developed PCM process enables efficient manufacturing of steel/CFRP B-pillar assemblies.
- This method eliminates the need for additional adhesive bonding between steel and CFRP components.
- The study demonstrates a viable approach for producing advanced lightweight automotive structures.
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