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백태현,Baek, Tae-Hyun 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.5
Risidual stress of cylindrical glass rods are measured by photoelasticity to study the variation of stresses with respect to heat treatment temperatures. In order to measure the stresses accurately, fringe sharpening and multiplication techniques are applied to the determination of photoelastic fringe orders. Filon's separationmethod is used to resolve circumferential and redial stress ocmponents from isochromatic fringes which are the same as in-plane maximum shearing stresses. According to the photoelastic measurements, residual stress is increased as the heat treatment temperature of the rods is raised from $560^{\circ}C$ to $650^{\circ}C$ All the circumferential stress components are changed from tensile stresses to compressive ones at approximate $R_m$/$R_o$ = 0.6, where $R_o$/ is outer radius and $R_m$any measured radius. This analysis shows that residual stresses of the glass rods approach zero if the rods are heat-treated near the strain point.
등각사상 맵핑 및 광탄성 실험법에 의한 원형구명 주위의 하이브리드 응력장 해석
백태현,김명수,이주훈,Baek, Tae-Hyun,Kim, Myung-Soo,Rhee, Ju-Hun 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6
An experimental study is presented for the effect of number of terms of a pewee series type stress function on stress analysis around a hole in tensile loaded plate. The hybrid method coupling photoelastsic data inputs and complex variable formulations involving conformal mappings and analytical continuity is used to calculate tangential stress on the boundary of the hole in uniaxially loaded, finite width tensile plate. In order to measure isochromatic data accurately, actual photoelastic fringe patterns are two times multiplied and sharpened by digital image processing. For qualitative comparison, actual fringes are compared with calculated ones. For quantitative comparison, percentage errors and standard deviations with respect to percentage errors are caculated for all measured points by changing the number of terms of stress function. The experimental results indicate that stress concentration factors analyzed by the hybrid method are accurate within three percent compared with ones obtained by theoretical and finite element analysis.
정수압을 받는 축대칭 절두체 원추형 압력용기의 응력해석
백태현,정태진,Baek, Tae-Hyun,Chung, Tae-Jin 한국정밀공학회 1992 한국정밀공학회지 Vol. No.
Theoretical equations for hoop stress, longitudinal or meridian stress and Von Mises stress of an axismmetric conical pressure vessel and a frustum of conical pressure velle, both of which are pressuized by hydrostatic loading, are derived from equilibrium equations. The membrane stresses conputed by theoretical equations for a conical pressure vessel and a frustum of conical pressure vessel are compared with the values obtained from finite elelment method. Based on the fact that the computational values by theoretical equations are well agreed with the finite element results, derived equations are proved to be valid and it is possible for those equations to be conveniently used for structural analysis or design of frustum of conical pressure vessel which is a part of silo body.
직교이방성 재료의 구멍주위에 관한 하이브리드 응력해석시 요소크기의 효과
백태현,Baek, Tae-Hyun 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.10
A numerical study for the number of terms of a power series stress function and the effect of hybrid element size on stress analysis around a hole in loaded orthotropic composites is presented. The hybrid method coupling experimental and/or theoretical inputs and complex variable formulations involving conformal mappings and analytical continuity is used to calculate tangential stress on the boundary of the hole in uniaxially loaded, finite width glass epoxy tensile plate. The tests are done by rarying the number of terms, element size and nodal locations on the external boundary of the hybrid region. The numerical results indicate that the hybrid method is accurate and powerful in both experimental and numerical stress analysis.
등색프린지 데이터를 이용한 인장하중 판재 중앙 균열선단 주위의 하이브리드 광탄성 응력장 해석
백태현(Tae Hyun Baek),첸레이(Lei Chen) 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.12
An experimental test is presented for photoelastic stress analysis around a crack tip in tensile loaded plate. The hybrid method coupling photoelastsic fringe inputs calculated by finite element method and complex variable formulations involving conformal mappings and analytical continuity is used to calculate full-field stress around the crack tip in uniaxially loaded, finite width tensile plate. In order to accurately compare calculated fringes with experimental ones, both actual and regenerated photoelastic fringe patterns are two times multiplied and sharpened by digital image processing. Regenerated fringes by hybrid method are quite comparable to actual fringes. The experimental results indicate that Mode I stress intensity factor analyzed by the hybrid method are accurate within three percent compared with ones obtained by empirical equation and finite element analysis.
한 개의 등색 프린지 패턴으로부터 디지털 영상처리에 의한 광탄성 프린지 증식법
백태현(Tae Hyun Baek),김명수(Myung Soo Kim),첸 레이(Lei Chen) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Photoelastic techniques are primarily applied in practice to the following three cases. The first case applies to two-dimensional models using transmission photoelasticity. The second one uses photoelastic coatings on actual components using reflection photoelastic techniques. The third case can be applicable to three dimensional models using the stress-freezing method. It is generally not easy to obtain higher order fringes in the second and third cases. Consequently, fringe multiplication is quite important since the standard methods of compensation used to evaluate fractional fringe orders are time-consuming. Fringe-multiplication is, in a sense, a whole field compensation technique where the fractional orders of the fringes can be determined simultaneously over the entire field of the model. This paper presents a simple technique of isochromatic fringe multiplication in photoelasticity using only one fringe pattern by digital image processing.
탄소성 이론과 유한요소법에 의한 강판재의 프레스 성형성 해석
백태현(Tae Hyun Baek),고승기(Seung Kee Koh),박태근(Tae-Geun Park),정걸(Girl Jung),황한영(Han Young Han) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.8
This paper presents the results obtained from the analysis for centralized stress distributions on the steel sheet metal sheet of vehicle's front bumper developed in press-forming and bending process. After calculating the stress distribution by finite element analysis, the point where the maximum stress comes into being can be determined. In order to avoid the crack which might be occurred in material when bending process, the product's material, shape and the minimum bending radius are proposed to be calculated by the simple elasto-plastic and empirical equation.