Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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The Structural Analysis of Three-Way Catalyst Substrate using Coupled Thermal-Fluid-Structural Analysis

열유동구조연성해석을 이용한 삼원촉매담체의 구조 해석

  • Lee, Sung-Riong (Department of Materials and Metallurgical Engineering, Kangwon National University) ;
  • Cho, Seok-Swoo (Department of Mechanical Design Engineering, Kangwon National University)
  • 이성룡 (강원대 재료금속공학과) ;
  • 조석수 (강원대 기계설계공학과)
  • Received : 2015.03.30
  • Accepted : 2015.05.07
  • Published : 2015.05.31
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Abstract

This study evaluates the thermal structural safety of the three-way catalyst(TWC) substrate for domestic passenger cars. Thermal-fluid boundary conditions on the TWC substrate were determined by D-optimal DOE. The thermal stresses on the TWC substrate were calculated by the temperature distribution obtained from the CFD results. The safety factors of the TWC substrate were determined by statistical strength and stress distributions and estimated to be 0.275. The thermal stresses for TWC substrate exceeded the strength of the material. Therefore, it is necessary to redesign the TWC substrate because it has much shorter service life than design life.

본 논문은 국내 승용차에 장착된 삼원촉매담체의 열적 구조 안전성을 평가한 것이다. 삼원촉매담체에 대한 열 유동 경계조건을 D-optimal 실험계획법로 결정한 뒤 이 값을 ANSYS CFX V11에 적용하여 촉매 온도 분포를 구하였다. 이러한 온도 분포를 ANSYS V11로 전달한 뒤 구조적 구속조건을 부여하여 담체의 열응력을 계산하였다. 이러한 열응력을 이용하여 삼원촉매담체의 재료강도분포와 실동하중조건하에서의 응력분포를 이용하여 해당 부품의 안전계수를 구하여 삼원촉매담체의 구조 안전성을 평가하였다. 본 연구에서 고려하는 삼원촉매담체는 구조적 안전계수가 0.275로, 발생 열응력이 설계 강도를 초과하고 있다. 따라서 삼원촉매담체는 설계 내구 수명 120,000km를 만족시키지 못하므로 본 부품에 대한 재설계가 요구된다.

Keywords

References

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