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    한글로보기

    https://www.riss.kr/link?id=T16626105

    • 저자
    • 발행사항

      부산: 부경대학교 대학원, 2023

    • 학위논문사항

      학위논문(석사) -- 부경대학교 대학원 , 재료공학과 , 2023. 2

    • 발행연도

      2023

    • 작성언어

      한국어

    • KDC

      530 판사항(6)

    • 발행국(도시)

      부산

    • 형태사항

      iii, 18 p.;: 삽화; 26 cm

    • 일반주기명

      부경대학교 논문은 저작권에 의해 보호받습니다.
      지도교수:남기우
      참고문헌

    • UCI식별코드

      I804:21031-200000670550

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    부가정보

    다국어 초록 (Multilingual Abstract) kakao i 다국어 번역

    영어
    한국어
    Many studies have reported the retardation in crack growth on the structural members and its principle. Until now, much research has been studied the change in the rate of crack growth by overstress. However, there are no studies on the fatigue life of machines and structures considering the size of the plastic zone due to overstress. Therefore, this study assumed semi-elliptical surface cracks with different aspect ratios (As) to evaluate the infinite life of four types of structural member due to overstress. As a result of the evaluation, infinite life is possible in most cases with appropriate overstress. The crack growth pattern according to the AS is determined by the surface crack (c) for the infinite life of As=1.0. In the case of As=0.6 and 0.3, it was determined from surface cracks and (c) and crack depth (a), but there were some differences depending on the material. When As= 0.1, it was determined only by the crack depth (a). The infinite life of fatigue cracks due to overstress is mostly affected by the crack size, design stress, and As, but crack size (a, c) has the greatest effect. Therefore, it is necessary to accurately measure the crack size (a, c) for the infinite life of the structure due to overstress.
    번역하기

    Many studies have reported the retardation in crack growth on the structural members and its principle. Until now, much research has been studied the change in the rate of crack growth by overstress. However, there are no studies on the fatigue life o...

    Many studies have reported the retardation in crack growth on the structural members and its principle. Until now, much research has been studied the change in the rate of crack growth by overstress. However, there are no studies on the fatigue life of machines and structures considering the size of the plastic zone due to overstress. Therefore, this study assumed semi-elliptical surface cracks with different aspect ratios (As) to evaluate the infinite life of four types of structural member due to overstress. As a result of the evaluation, infinite life is possible in most cases with appropriate overstress. The crack growth pattern according to the AS is determined by the surface crack (c) for the infinite life of As=1.0. In the case of As=0.6 and 0.3, it was determined from surface cracks and (c) and crack depth (a), but there were some differences depending on the material. When As= 0.1, it was determined only by the crack depth (a). The infinite life of fatigue cracks due to overstress is mostly affected by the crack size, design stress, and As, but crack size (a, c) has the greatest effect. Therefore, it is necessary to accurately measure the crack size (a, c) for the infinite life of the structure due to overstress.

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    목차 (Table of Contents)

    • Ⅰ. 서론 1
    • Ⅱ. 재료 및 평가방법 2
    • 1. 평가시험편 2
    • 2. 과대응력으로 무한 수명이 가능한 균열 크기 평가 3
    • 3. 미소균열의 피로균열 진전평가 5
    • Ⅰ. 서론 1
    • Ⅱ. 재료 및 평가방법 2
    • 1. 평가시험편 2
    • 2. 과대응력으로 무한 수명이 가능한 균열 크기 평가 3
    • 3. 미소균열의 피로균열 진전평가 5
    • Ⅲ. 결과 및 고찰 6
    • Ⅳ. 결론 16
    • REFERENCES 17
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