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강구조물에 대한 현장에서의 비파괴적 인장물성 평가 기술 개발
손동일 ( Son Dongil ),최열 ( Choi Yeol ),장재일 ( Jang Jae-il ),권동일 ( Kwon Dongil ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
A newly developed Advanced Indentation System (AIS), which is a portable and nondestructive system for evaluating tensile properties, was used to measure stress-strain behavior of steel structure. For all test materials and conditions, the AIS-derived results were in good agreement with those from conventional standard test method. Furthermore, the nondestructive AIS test results rigorously indicated the various levels of degradation of materials. Examples of the test results are given and potential applications of the AIS to assess the integrity of aging structures are briefly discussed.
연속압입 시험기법을 이용한 석유화학설비 경년손상의 새로운 평가변수 고찰
장재일,최열,손동일,이윤희,권동일,김정태,Jang, Jae-Il,Choi, Yeol,Son, Dongil,Lee, Yun-Hee,Kwon, Dongil,Kim, Jeoung-Tae 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.5
Newly developed continuous indentation technique has made nondestructive assessment of tensile properties possible. The present study was undertaken to determine new parameters for indicating time-dependent material degradation of petro-chemical plant. Continuous indentation tests were performed for Cr-Ni steel and Cr-Mo steel which are widely used as facilities of petro-chemical plant. From the results, it was found that yield strength and tensile strength cannot be used as general degradation parameters because the changes in the strengths with aging time didn't show any tendency. On the other hand, work hardening exponent and yield ratio showed consistent tendency with increasing aging time. Therefore, nam attention of this work was paid on them as new degradation parameters, and the in-field applicability of the parameters was evaluated and discussed.
Advanced Indentation System을 이용한 현장에서의 구조강도 건전성 평가
최열(Choi Yeol),손동일(Son Dongil),장재일(Jang Jae-il),권동일(Kwon Dongil) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
For the structural integrity of large and complex structures such as railway vehicle, the in-field diagnosis of mechanical properties of the structures is needed, and especially, the mechanical characteristics of the weldment must be carefully evaluated. But, conventional standard testing methods having destructive procedures are not applicable to in-field assessment of mechanical property variations within weldment because they needs the limitations of specimen size and geometry. In this paper, to overcome this problems, the advanced indentation technique (AIS) is introduced for simple and non-destructive/in-field testing of weldment of industrial structures. This test measures indentation load-depth curve during indentation and analyzes the mechanical properties related to deformation and fracture. First of all, flow properties such as yield strength, tensile strength and work hardening index can be evaluated through the analysis of the deformation behavior beneath the spherical indenter. Additionally, case studies of advanced indentation techniques are introduced.
비파괴 신기술을 이용한 석유화학설비 경년손상의 새로운 평가변수 고찰
장재일(Jae-il Jang),최열(Yeol Choi),손동일(Dongil Son),이윤희(Yun-Hee Lee),권동일(Dongil Kwon),김정태(Jeoung Tae Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
Newly developed continuous indentation technique has made nondestructive assessment of tensile properties possible. The present study was undertaken to determine new parameters for indicating time-dependent material degradation of petro-chemical plant. Continuous indentation tests were performed at Cr-Ni steel and Cr-Mo steel which are widely used as facilities of petro-chemical plant. From the results, it was found that yield strength and tensile strength cannot be used as general degradation parameters because the change tendencies of the strengths with aging time are variable. On the other hand, work hardening exponent and yield ratio showed consistent tendency with increasing aging time. Therefore, main attention of this work was paid on them as new degradation parameters, and the in-field applicability of the parameters was evaluated and discussed.
자동차용 CTR-Panel의 인몰드 데코레이션 공정조건에 관한 연구
서봉현(Bonghyun Seo),노상호(Sangho Noh),손동일(Dongil Son),최동혁(Donghyuk Choi),김선경(Sunkyung Kim),이경수(Kyoungsu Lee) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Injection molded thermoplastics parts may need to be coated to facilitate paint adhesion, or to surface property requirements, such as appearance, durability, and weather resistance. Injection molding as a fabrication method for plastic products has a high productivity and can be easily obtaining uniform quality products. However, the application of a coating to an injection molded part is still a time-consuming and cost-intensive procedure. Additionally, the post-coating processes can emit Volatile Organic Compounds(VOCs), some of which can have short- and long- term adverse health effects. In order to solve this problem, The In-Mold Decoration process is an innovative method integrated with the injection molding and the coating processes because plastic injection is proceeded in molds after closing and holding the polymer film between the upper and lower molds. In this study, we will establish IMD process conditions of the CTR-Panel for automobiles.
응력 상호작용과 연속압입 기법을 이용한 SS400 강봉의 굽힘 잔류응력 평가
李潤熙,池原宰,孫東一,張宰溢,權東一 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.10
Apparent mechanical properties of welded structural components are deviated from the initially designed values due to the residual stress. Thus, exact assessment of the residual stress using a nondestructive method became an important issue in reliability researches. A nanoindentation model for evaluating the equi-biaxial thin film residual stress was proposed in the previous study. However, the surface residual stress in the welded joint is a non-equi-biaxial state and complex elastic/plastic deformations are involved in the macroindentation. Therefore, the previous model was modified to evaluate the real non-equi-biaxial residual stress by considering a new stress-proportional factor and a significant effect of the plasticity. The newly modified stress-analyzing model was verified empirically by comparing the evaluated uniaxial stress with the already known residual stress of 4-point bended specimen.