서지주요정보
레이저변위게이지를 이용한 홀에서의 모서리균열진전에 관한 연구 = A study on corner crack at a hole using laser interferometry strain/displacement gage
서명 / 저자 레이저변위게이지를 이용한 홀에서의 모서리균열진전에 관한 연구 = A study on corner crack at a hole using laser interferometry strain/displacement gage / 김종호.
저자명 김종호 ; Kim, Jong-Ho
발행사항 [대전 : 한국과학기술원, 1994].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8004467

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 94011

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

This paper describes the results of a numerical and experimental study of the behavior of comer crack located at a hole. The comer crack growth shape depends on stress concentration factor, initial crack shape condition, and load condition such as load ratio R and load interaction. Fatigue crack growth tests are conducted with 7075-T6 aluminum alloy specimens by measuring the crack closure using Laser Interferometry Strain / Displacement Gage(ISDG). This measuring device has been used due to the following features such as a very short gage length, no electrical or mechanical contact, no temperature sensitivity, ability of measuring the displacement near the crack tip. In paticular, the single tensile overload test is performed to investigate the load interaction effect. On the other hand, because the crack opening load has significantly an effects on fatigue crack growth rate, it is important to find exact crack opening load. Even though the crack opening load is determined from Load and Reduced Displacement signal, there is no generally accepted way to measure the exact crack opening load. A new method to determine crack opening load from displacement difference signal of the photo-diode of the ISDG is suggested. And because the opening load is sensitive to measurement location, proper the measurement location was also suggested through crack opening simulation and experiments using ISDG. The corner crack front shape and the growth behavior were obtained through numerical simulation. The experiments performed with 7075-T6 aluminum specimen confirmed the simulated crack front shape and the growth of the corner crack.

서지기타정보

서지기타정보
청구기호 {MME 94011
형태사항 vi, 50 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 응력강도계수의 계산
저자명의 영문표기 : Jong-Ho Kim
지도교수의 한글표기 : 이순복
지도교수의 영문표기 : Soon-Bok Lee
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 20-21
주제 Fracture mechanics.
Laser interferometers.
Stress concentration.
Metals --Fatigue.
Displacement transducers.
레이져 응용. --과학기술용어시소러스
균열 전파. --과학기술용어시소러스
파괴 역학. --과학기술용어시소러스
피로 파괴. --과학기술용어시소러스
응력 집중. --과학기술용어시소러스
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