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Mineral/glass reinforced polypropylene compounds, as an alternative engine cover material, offers weight as well as cost reduction. The polypropylene compound’s low strength requires, however, careful consideration of structural failure in the design of the engine cover. In this study, fatigue failure of the mineral/glass reinforced polypropylene compounds engine cover is discussed. In order to predict dynamic behavior of the engine cover, natural frequencies of the system were calculated considering the damping effect of the structure. Extracted natural frequencies were compared with the measured data from experimental modal analysis (EMA). Dynamic time history of the stress distribution in the engine cover under vibration load and assembly load was calculated based on the extracted natural frequencies of the system. Experimental measurements of strains were performed to verify the results of the analysis. Based on the calculated stress data and measured S-N curve for the engine cover material, safety factors of the engine cover were predicted. In order to improve the durability of the engine cover, design modifications of the engine cover were investigated. Durability test results showed close correlation with the analysis data. Study showed that consideration of the assembly load was necessary to predict the fatigue failure of the engine cover system.

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Abstract
1. 서론
2. 재료 시험
3. 동적 모드 매개 변수의 측정
4. 유한 요소 해석
5. 동적 응력 측정
6. 피로해석 및 실험
7. 결론
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UCI(KEPA) : I410-ECN-0101-2010-556-001483152