With increasing use of SUH35/SUH3 dissimilar materials for automotive engine valves, it is required that stress singularities under residual stress on an interface for friction welded dissimilar materials analyzed to establish strength evaluation. The stress singularity index() and stress singularity factor( ) were calculated by using the results of stress analysis considering residual stress and loads. The stress singularities on variations for temperatures and loads acting from outside were analyzed and discussed. This paper suggested that the strength evaluation by using the stress singularity factors as fracture parameters, considering the stress singularity on an interface edge of friction welded dissimilar materials will be useful.

Abstract
 1. 서론
 2. BEM에 의한 열응력 해석
  2.1 엔진용 밸브의 이종접합계면 형상
  2.2 이종 접합계면 모델
  2.3 BEM 열응력 해석
  2.4 2차원 BEM 열응력
 3. 접합계면의 응력분포
  3.1 외부응력이 없는 경우
  3.2 외부응력의 중첩
 4. 용접계면의 응력특이성 해석
  4.1 응력특성방정식
  4.2 열응력특이성
  4.3 응력특이성지수의 계산
  4.4 응력특이성계수의 계산
 5. 해석결과 및 고찰
 6. 결론
 참고문헌

• 박철희(인천대학교(제물포캠퍼스) 기계로봇공학과) | C. H. Park
• 김은영(인천대학교 기계로봇공학과) | E. Y. Kim 교신저자