Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Durability Assessment of CFRP Lower Control Arm Using Stress-Life Method

응력수명법을 이용한 탄소섬유강화복합재 로어 컨트롤 아암의 내구성 평가

  • Jang, Jaeik (School of Mechanical Engineering, Yonsei Univ.) ;
  • Lim, Juhee (School of Mechanical Engineering, Yonsei Univ.) ;
  • Lee, Jongsoo (School of Mechanical Engineering, Yonsei Univ.)
  • Received : 2017.07.05
  • Accepted : 2017.08.23
  • Published : 2017.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

Recently, regulations on fuel efficiency and $CO_2$ emissions have been reinforced in automobile industries. As a result, many companies make an effort to satisfy these regulations by adapting composite materials to the automobile body as well as its components. In particular, the lower control arm in the suspension system is subjected to heavy loads and is designed to be thick to meet operating loads. Therefore, it is essential for the lower control arm to reduce weight and to secure the durability assessment. In this paper, we conducted structural analysis by performing stress and stiffness analysis under given load conditions through finite element analysis, and verified whether it satisfies the load and stiffness conditions. The inertia relief method is adapted to the process of analysis, and the principal stress is used as a criterion for evaluation. Based on these results, the durability assessment is carried out using the stress-life method.

최근 자동차 분야에서의 $CO_2$ 배출 및 연비에 대한 규제가 강화되고 있다. 이에 따라 여러 기업들은 차체 및 차량부품에 복합재료를 적용하여 경량화를 이루고 연비향상을 통해 규제를 만족하고자 한다. 특히 현가파트 중 강한 하중을 받는 로어 컨트롤 아암의 경우, 운전조건을 만족하기 위해 대부분 두껍고 무겁게 설계된다. 따라서, 로어 컨트롤 아암의 경량화 및 그에 따른 내구성평가가 필수적으로 요구된다. 본 연구에서는 먼저 유한요소해석을 통해 하중조건에 따른 강도 및 강성 해석 값이 경계조건을 만족하는지 확인하기 위하여 구조해석을 수행하였다. 해석 과정에는 주응력 값을 기준으로 평가하고 관성 제거기법을 적용하였다. 또한, 이를 바탕으로 응력-수명법을 이용하여 내구성평가를 실시하였다.

Keywords

References

  1. Jacob, A., 2010, "BMW Counts on Carbon Fiber for its Megacity Vehicle," Reinforced plastics, pp. 38-41.
  2. Lee, D. H. and Park, Y. C., 2003, "Multi-objective Optimization of Lower Control Arm Considering the Stability for Weight Reduction," The Korean Society of Automotive Engineers, Vol. 11, No. 4, pp. 94-101.
  3. Jung, Y. S., Na, J. H., Min, S. J. and Kim, Y. S., 2013, "Multi-Performance Structural Optimization of a Lower Control Arm for Weight Reduction," Proceeding of the Korean Society of Automotive Engineers, No. 5, pp. 1290-1292.
  4. Bannantine, J. A., Comer, J. J. and Handrock, J. L., 1989, "Fundamentals of Metal Fatigue Analysis," Prentice Hall, Upper Saddle River, NJ.
  5. Park, J. H., Son, K. R. and Park, I. H., 2014, "Improvement of Durability for Aluminum Control Arm by Fatigue Analysis under Vehicle Load Condition," Proceeding of the Korean Society of Automotive Engineers, No. 5, pp. 427-432.
  6. Kong, K., Park, Y. B., Park, H. W., Keum, J. W., Jeong, H. S. and Jung, Y. B., 2011, "Design Optimization of the Lower Arm using the Carbon Fiber Reinforced Polymer(CFRP)," Proceeding of the Korean Society of Automotive Engineers, pp. 23-37.
  7. Park, H. S. and Choi, J. H., Koo, J. M. and Seok, C. S., 2010, "Fatigue Damage Evaluation of Woven Carbon-Fiber-Reinforced Composite Materials by Using Fatigue Damage Model," Trans. Korean Soc. Mech. Eng. A, Vol. 34, No. 6, pp. 757-762. https://doi.org/10.3795/KSME-A.2010.34.6.757
  8. Mao, H. and Mahadevan, S., 2002, "Fatigue Damage Modelling of Composite Materials," Composite Structures, Vol. 58, pp. 405-410. https://doi.org/10.1016/S0263-8223(02)00126-5
  9. Abdelal, G. F., Cacers, A. and Barbero, E. J., 2002, "A Micro-Mechanics Damage Approach for Fatigue of Composite Materials," Composite Structures, Vol. 56, pp. 413-422. https://doi.org/10.1016/S0263-8223(02)00026-0
  10. Lim, J., Doh, J., Yoo, S. H., Kang, O., Kang, K. and Lee, J., 2016, "Sizing Optimization of CFRP Lower Control Arm Considering Strength and Stiffness Conditions," Korean Journal of Computational Design and Engineering, Vol. 21, No. 4, pp. 389-396. https://doi.org/10.7315/CDE.2016.389
  11. Khan, S. U., Munir, A., Hussian, R. and Kim, J. K., 2010, "Fatigue Damage Behaviors of Carbon Fiber- Reinforced Epoxy Composites Contacting Nanoclay," Composite Science and Technology, Vol. 70, No. 14, pp. 2077-2085. https://doi.org/10.1016/j.compscitech.2010.08.004
  12. Mori, T. and Tanaka, T., 1973, "Average Stress in the Matrix and Average Elastic Energy of Materials with Misfitting Inclusions," Acta Metallurgica, Vol. 21, No. 5, pp. 571-574. https://doi.org/10.1016/0001-6160(73)90064-3
  13. HyperMesh User Guide, HyperMesh Version 11.0, Altair Engineering Inc., Troy, MI, 2012.
  14. Nithin, K. and Veeresha, R., 2013, "Analysis of Front Suspension Lower Control Arm of an Automobile Vehicle," International Journal of Science and Research, Vol. 2, pp. 51-56.
  15. Heo, S. J., Kang, D. O., Lee, J. H., Lee, I. H. and Darwish, S. M. H., 2013, "Shape Optimization of Lower Control Arm Considering Multi-disciplinary Constraint Condition by Using Progress Meta-model Method," International Journal of Automotive Technology, Vol. 14, No. 3, pp. 499-505. https://doi.org/10.1007/s12239-013-0054-7
  16. Bessert, N. and Fredrich, O., 2005, "Nonlinear Airship Aeroelasticity," Journal of Fluids and Structures, Vol. 21, No. 8, pp. 731-742. https://doi.org/10.1016/j.jfluidstructs.2005.09.005
  17. Reifsnider, K. L., Henneke, E.G., Stinchcomb, W. W. and Duke, J. C., 1983, "Damage Mechanics and NDE of Composite Laminates," Mechanics of Composite Materials: Recent advances, pp. 399-420.
  18. Kim, J. K., Park, Y. C., Kim, Y. J. and Lee, K. H., 2009, "Structural Optimization of a Control Arm with Consideration of Durability Criteria," Trans. Korean Soc. Mech. Eng. A, Vol. 33, No. 11, pp. 1225-1232. https://doi.org/10.3795/KSME-A.2009.33.11.1225
  19. Park, H. S., Kim, J. K., Seo, . M. K., Lee, H. and Park, Y. C., 2009, "Structural Design of a Front Lower Control Arm considering Durability," Journal of The Korean society of Manufacturing Process Engineers, Vol. 8, No. 4, pp. 69-75.
  20. Jen, M. and Lee, C., 1998, "Strength and Life in Thermoplastic Composite Laminates under Static and Fatigue Loads. Part I : Experimental," Int. J. Fatigue, Vol. 20, No. 9, pp. 605-615. https://doi.org/10.1016/S0142-1123(98)00029-2