서지주요정보
작은 표면피로균열의 진전거동에 관한 기초 연구 = A fundamental study on growth behavior of small surface fatigue cracks
서명 / 저자 작은 표면피로균열의 진전거동에 관한 기초 연구 = A fundamental study on growth behavior of small surface fatigue cracks / 정병환.
저자명 정병환 ; Jung, Byung-Hwan
발행사항 [대전 : 한국과학기술원, 1997].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8008090

소장위치/청구기호

학술문화관(문화관) 보존서고

MADE 97023

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초록정보

Crack growth behavior of small surface fatigue cracks is investigated for constant amplitude loading using in-plane bending specimens of 2024-T351 aluminum alloy. As small as 50㎛-radius semi-spherical starter notch is prepared by one pulse laser striking and subsequent mechanical polishing. Fatigue crack growth tests are performed under a stress ratio of zero at a frequency of 20Hz. Crack growth is monitored continuously during the test by an unloading elastic compliance method using back face strain gauge. Crack path morphology is observed. The initial growth rate of small surface cracks decreases and reaches to a minimum at a crack depth of about 0.4mm regardless of applied loads. Crack growth rates of small surface cracks in terms of the stress intensity factor are dependent on the magnitude of applied load. Crack growth rates of small surface cracks can not be expressed by the effective stress intensity factor range based on crack closure measurements. For small surface cracks deeper than 0.4mm, crack growth predictions are performed using the result of through-thickness short cracks and long surface cracks.

서지기타정보

서지기타정보
청구기호 {MADE 97023
형태사항 vi, 68 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Byung-Hwan Jung
지도교수의 한글표기 : 송지호
지도교수의 영문표기 : Ji-Ho Song
학위논문 학위논문(석사) - 한국과학기술원 : 자동화및설계공학과,
서지주기 참고문헌 : p. 30-33
주제 작은 표면피로균열
균열진전속도
응력강도계수
균열형상비
Small surface fatigue crack
Crack growth rate
stress intensity factor
crack aspect ratio
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