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KEPIC 개발현황 및 ISO/IEC Guide 21 적용방안
박태종(Tae-Jong Park),안영태(Young-Tae Ahn) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Korea Electric Power Industry Code(KEPIC), a set of integrated codes and standards applicable to the design, construction and operation of electric power facilities including pressure equipments of nuclear and conventional power plants, has been developed on the basis of referring to the prevailing U.S.A codes and standards which had been applied to the electric power facilities in Korea. The first edition of KEPIC has been published in 1995, the second edition in 2000. The third edition will be published in August, 2005. Along with the effectuation of the Agreement on Technical Barriers to Trade (TBT) in 1995, the Korea Electric Association(KEA) being a developing and managing organization of the KEPIC notified ISO/IEC Information Center to accept the Code of Good Practice in the Agreement on TBT. The KEA, therefore, should comply with the intention of the Agreement, and the 2005 edition of KEPIC will be published to be retrofitted according to the ISO/IEC Guide 21 - Adoption of International Standards as regional or national standards. ISO/IEC Guide 21 provides the three(3) type methods(Identical/Modified/Not Equivalent) for adoption of International Standards for indicating the degree of correspondence. This paper makes a brief introduction on general status of KEPIC, the outline of ISO/IEC Guide 21, and its application methods to KEPIC.
파괴역학 기반 피로 수명 평가를 위한 피로 균열 진전 파라미터에 관한 연구
김현수(Hyeon-Su Kim),박태종(Tae-Jong Park),이동주(Dong-Ju Lee),신상범(Sang-Beom Shin),김명현(Myung-Hyun Kim) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.1
Recent studies on the fatigue assessment of high strength steel weld based on the fracture mechanics have frequently raised the problems related to the conservatism in the fatigue crack growth rate specified in the relevant design code. The purpose of this study is to evaluate the effect of the fatigue crack growth parameter on the fatigue life for the low carbon steel weld. In order to do it, the fatigue tests with the constant stress ratio were performed to evaluate the fatigue crack growth rate in the butt weld of SM490. And the fatigue crack growth parameters of the weld were evaluated in accordance with ASTM E647. From the comparative fatigue assessment results, it was found that the fatigue crack growth rate specified in the relevant design code was too conservative to estimate the residual fatigue life of welded structure. So, in order to get the more reliable results, it was recommended that the fatigue life estimation based on the fracture mechanics be performed with the fatigue crack growth parameter specified by test.
Reverse Bending을 통한 CTOD 시험 예비균열 형상균일화에 관한 연구
정세환,박동환,김현수,신상범,박태종,Jeong, Sehwan,Park, Dong-Hwan,Kim, Hyeon-Su,Shin, Sang-Beom,Park, Tae-Jong 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.2
This study investigates the appropriate range of reverse bending load for the CTOD test of thick weld by observing improvement of pre-crack shape and determination of the limit applicable load. In order to do it, the effect of the amount of the reverse bending load on the maximum deviation of the pre-crack length was investigated by the extensive tests, and the variation of plastic zone size in way of the crack tip under reverse bending load were evaluated by FEA. With the results obtained by the experiments and FEA, the proper range of reverse bending load was suggested. The effectiveness of the reverse bending method was verified by examining the pre-crack straightness after CTOD tests of thick weld specimens with various thickness and strength.
이충근 ( Choung Keun Lee ),최용 ( Yong Choi ),최덕규 ( Duck Kyu Choi ),강태경 ( Tae Gyoung Kang ),전현종 ( Hyeon Jong Jun ),최일수 ( Il Su Choi ),박태종 ( Tae Jong Park ) 한국국제농업개발학회 2015 韓國國際農業開發學會誌 Vol.27 No.1
Comparative analysis of the general distribution status and major performance for rice transplanters in Korea provided the following results. Distribution number of rice transplanter has remained the 5 thousand units currently a big decrease from 46 thousand units in 1997, due to high performance and larger domestic rice transplanter. Distribution models were mainly 4 rows in 1997, but 6 rows were accounted for 85% in 2014. Work efficiency showed 38 ~ 59a/h in the case of 6 rows and varied greatly depending on the rated power output. Missed hill ratios were 2.5% or less, except that hill seeding type rice transplanters were not correlated with an increase in number of seedling hills. Finally, farmers must take missed hills, work efficiency, convenience of the move and price into account, when choosing a rice transplanter. And selection of rice transplanter is important, and should consider support of the agriculture-friendly environment. The researchers should develop technologies such as autonomous straight apparatus that would overcome the differences in the skill of the workers, and high performance 8 row rice transplanters of ultra-light weight.