This study analyzes lifes and damages at two automotive grills in use through the structural analyses with fatigue. As maximum equivalent stress in case of aftermarket grill frame becomes smaller more 15 times than horizontal grill frame, aftermarket grill is shown to be more stable. The lowest damage becomes 2968 in case of ‘SAE bracket history’ with the severest change of load at aftermarket grill. As it becomes smaller more 5 times than horizontal grill frame, aftermarket grill has more durability. Among the cases of nonuniform fatigue loads, ‘Sample history’ with the slowest change of load becomes most unstable in case of horizontal grill frame but ‘SAE bracket history’ with the severest change of load becomes most stable in case of aftermarket grill frame. The structural result of this study can be effectively utilized with the design of automotive grill frame by investigating prevention and durability against its damage.

Abstract
 1. 서론
 2. 모델링 및 경계조건
  2.1 모델링
  2.2 모델의 경계 조건
 3. 해석 결과
  3.1 응력 해석
  3.2 피로 해석
 4. 결론
 참고문헌

• 조재웅(공주대학교 기계자동차공학부) | Jae-Ung Cho