Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Development of the CFRP Automobile Parts Using the Joint Structure of the Dissimilar Material

결합부 강화구조용 탄소복합재 자동차 부품 개발

  • Ko, Kwan Ho (Composites Processing Division, Korea Institute of Carbon Convergence Technology) ;
  • Lee, Min Gu (Composites Processing Division, Korea Institute of Carbon Convergence Technology) ;
  • Huh, Mongyoung (Composites Processing Division, Korea Institute of Carbon Convergence Technology)
  • Received : 2018.11.01
  • Accepted : 2018.12.17
  • Published : 2018.12.31
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Abstract

In this study, the development purpose is to replace steel Tie Rod of commercial vehicle to the carbon composite by a braiding process. CFRP tie rod was designed to meet the performance requirements of existing products by designing the cross section of the core for braiding weaving and the structural design of the joint between the core and the carbon fiber. The specimens were fabricated by braiding method and applied to structural analysis through test evaluation. The manufacturing process proceeded from braiding to infusion through post-curing process. The test evaluation of the final product was satisfactorily carried out by sequentially performing tensile test, torsion test, compression test and fatigue test. In addition, the weight of CFRP tie rod could be reduced by about 37% compared to existing products.

본 연구에서는 기존의 스틸재 타이로드를 브레이딩 공법을 적용한 탄소복합재로 개발하고자 하였다. 탄소복합재 타이로드는 기존 제품과 동등한 성능을 만족시키기 위하여 브레이딩 직조에 필요한 코어 단면설계, 코어와 탄소섬유의 접합부에 대한 구조형상설계를 진행하였다. 그리고 브레이딩 공법을 적용한 시편을 제작하여 시험평가를 통해 구조해석에 적용하였다. 제작 공정은 브레이딩 직조 후 인퓨전 공정을 거쳐 후경화 공정까지 진행하였으며 최종 제품에 대한 시험평가는 인장 시험, 비틀림 시험, 압축 시험과 피로시험을 순차적으로 진행하여 모두 만족시켰다. 또한 탄소복합재 타이로드의 중량을 기존 제품 대비 약 37% 정도 경량화시킬 수 있었다.

Keywords

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Fig. 1. Shape of TIE ROD

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Fig. 2. Core shape of CFRP TIE ROD

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Fig. 3. Test equipment of tensile test

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Fig. 4. After shape of specimen for UD18 and UD36 in tensile test

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Fig. 5. Load/Boundary Condition for tensile and torsion

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Fig. 6. Load/Boundary Condition for compression

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Fig. 7. Stress distribution of dir. 0° and 90° for Compression

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Fig. 8. Stress distribution of dir. 0° and 90° for Tensile

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Fig. 9. Stress distribution of dir. 0° and 90° for Torsion

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Fig. 10. Braiding process of CFRP TIE ROD

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Fig. 11. Infusion process of CFRP TIE ROD

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Fig. 12. CFRP TIE ROD

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Fig. 13. Three types of Core shape for ball joint region

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Fig. 14. Test process of tensile test for ball joint region

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Fig. 15. Test process of torsion test

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Fig. 16. Test process of compression test for TIE ROD

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Fig. 17. Test process of Fatigue test for TIE ROD

Table 1. Tensile test results of specimen for UD18 and UD36

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Table 2. Analysis result for final design

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Table 3. Test result of CFRP TIE ROD for tensile and torsion

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Table 4. Test result of CFRP TIE ROD

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