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이기백,나종문,김정훈,Lee, Ki-Baik,Na, Jong-Moon,Kim, Jeong-Hun 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.10
In this paper, the propagation of elastic wave generated by loading impact to plates made of isotropic of anisotropic material was studied. And the influence of boundary conditions (free or clamped edge) upon the reflection of elastic wave was anlyzed. Also, double exposure holographic interferometer using ruby pulse laser was formed in order to investigate transient waves. Before the elasitc wave was reflected from the edges, the elastic wave of isotropic plate such as aluminum plate showed circular interferometric fringe pattern, whereas that of anisotropic plate such as epoxy composite laminates showed elliptical one. And the transverse displacement curves obtained from experiment and theory for both plates agreed well. Also, the waves reflected from the boundary edges showed much differences according to the boundary condition of edges.
TMCP강의 부식 환경하에서의 과대하중이 피로균열진전에 미치는 영향
이기백(Ki-Baik Lee),송득중(Duk-Joong Song) 산업기술교육훈련학회 2012 산업기술연구논문지 (JITR) Vol.17 No.1
The load working on real marine structures by an accident great wave or a ocean storm is not a load contains regular wavelength but a variable load with variable wavelength and power. Simplifying the variable load and investigation about the overload effect on the fatigue crack propagation behavior become more important subject. Corrosion fatigue phenomena as the source of damages will become a source of fatigue crack on the material surface. An explanation of fatigue crack propagation behavior on the variable load will be very important on estimate the lifetime or estimate the remained lifetime of the using real machine on the design. Simplifying the variable load and investigation about the overload effect to fatigue crack propagation behavior become most important subject. So, We investigate the TMCP(Thermo-Mechanical Control Process) steel s crack propagation velocity delay and acceleration effects according to the overload loading under artificial seawater environment. And we conclude belows. 1. The delay ration tendency about the magnitude of ΔK on the air was different from that on the seawater. 2. The crack propagation velocity differences of the overall delay time zone on the air relate the magnitude of the delay ratio. And the lower crack propagation velocity makes the great delay ratio in the overall delay time zone on working the corrosion. 3. The more overload repeating times make the great delay ratio on the air and the seawater, especially the 100 times makes much great delay ratio than a time or the 10 times.