This paper presents a method for the assesment of thermal and vibration fatigues in integral exhaust manifold/turbine housing system. Most of failures on turbine housing are observed by thermal cyclic loads. In order to predict thermal failures by finite element analysis, we considered the temperature-dependent inelastic materials and transient temperature histories based on the thermal shock test. The results showed that the plastic strains of localized critical regions such as valve seat coincided well with crack locations from an endurance test. But, some failures around neck areas of turbine housing could not predict from thermal stress analysis. These cracks were originated due to the vibration excitations near resonance frequencies within engine operating ranges. The stress results of neck areas, which divided by temperature dependent yield stresses, from harmonic analysis showd a good agreement with experimental results.

Abstract
 1. 서론
 2. 진동측정
  2.1 운전 및 정지상태에서의 진동 측정
  2.2 상온 및 고온 진동측정 결과의 상관성
 3. 터빈하우징의 구조해석
  3.1 열응력 해석
  3.2 일체형 터빈하우징의 진동해석
 4. 결론
 References

• 이인범(㈜ 계양정밀 기술연구소) | I. B. LEE,
• 김구성(㈜ 계양정밀 기술연구소) | K. S. KIM
• 최복록(강릉원주대학교 기계자동차공학부) | B. L. CHOI Corresponding Author