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콘크리트 구조체 매입 철근의 직경 및 유형별 앵커력 측정실험 연구
조성열 ( Seong Yeol Cho ),손기상 ( Ki Sang Son ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.5
Construction equipment such as tower crane should be installed in a field without appropriate anchorage to cause a collapse of crane. The anchorage capacity can be varied with Anchor length, concrete strength, anchor diameter, hooked or non hooked .these variables will be made and tested in the study. It is shown what anchorage capacity will be more effective case by case. Hooked and non-hooked rebar anchor concrete weight with dia 22mm rebar are shown with initial displacement at 170~220KN of hooked case and200~210KN of non-hooked one which are linearly increased, without any ductility behavior with almost brittleness. Three(3) same test pieces are almost similarly behaviored without relation to hooked or non-hooked cases. It is found out that the bigger diameter of rebar becomes, the more resistant capacity could be made, but conversely ductility against sudden collapse similar to brittleness becomes the more insufficient. It is also found out that dia 16mm rebar could be more effectively applied to heavy support weight at construction sites.
조성열 ( Seong Yeol Cho ),손기상 ( Ki Sang Son ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.1
Many construction equipment or supporting structure should be installed in a field without appropriate anchorage to cause a collapse of those. Anchor length, anchor diameter, hooked or non hooked will be made and tested in the study. This one will be analyzed and compared with the previous study in order to find out some difference, strength by strength, based on this study. Embedded re-bar and the resistant capacity against pulled out force of re bar have been tested and analyzed by concrete design strength and rebar diameter in the study. 21Mpa and 24MPa compressive strength which are used in construction practice have been applied as variables. Thoserebars are composed of D13, D16. D22 which are mostly used at construction sites. The followings are summarized as conclusions.1)ductility is not increased as rebar diameter becomes larger under the condition of non-hooked anchorage.2) those are two times of displacement difference between small diameter of rebar and large one with hooked anchorage of rebar while being 1/10 times difference with non-hooked condition but, only 10% difference of maximum load are shown, not conspicuously between hooked and non-hookedcondition.3) displacement related to ductility can be three(3) times decreased if only concrete compressive strength and rebar diameter become larger with heavy support weight.
유한요소법을 이용한 비대칭 스플라인 홈을 갖는 래칫기어의 다단 냉간단조 공정설계
조해용 ( Hae Yong Cho ),조성열 ( Seong Yeol Cho ),김관우 ( Kwan Woo Kim ),이병구 ( Byung Gu Lee ) 충북대학교 산업과학기술연구소 2009 산업과학기술연구 논문집 Vol.23 No.2
Forging process of ratchet gear with asymmetric spline groove in the inside and ratchet teeth in the outside has been studied by using finite element method(FEM). For the shape complexity of the ratchet gear teeth, it is impossible to forge with single-stage. Thus, multi-stage process has been considered. To plan appropriate process, process sequence and die design are considered by the design rules. The process planning considered by the design rules was analyzed by DEFORM-3D. The final process is planned. And to improve the final process planning, the appropriate conditions of die design are found. They are applied in the final process planning. The experimental trials have been implemented with same conditions of simulation. As a result, multi-stage process planning for forging ratchet gear has been suggested. And the simulated results have been verified by the experimental results.
탄성회복을 고려한 반원형 코터 단조에 관한 유한요소해석
조해용 ( Hae Yong Cho ),이병구 ( Byung Gu Lee ),김종원 ( Jong Won Kim ),김관우 ( Kwan Woo Kim ),김문기 ( Moon Ki Kim ),조성열 ( Seong Yeol Cho ),한기범 ( Ki Beom Han ),김기복 ( Kibok Kim ) 충북대학교 산업과학기술연구소 2009 산업과학기술연구 논문집 Vol.23 No.1
Forging process of half-circle cotter has been studied by using finite element method in this thesis. Half-circle cotter is used as a part in the valve system of a vehicle for the purpose of fixing a valve-spring. The half-circle cotter is formed by cold forging process. Currently, elastic springback is regarded as the important factor to improve the dimensional accuracy for complete forming at the cold forging. So, this study carried out the simulation considering elastic springback by the finite element analysis method. The new forging process was established by redesigning die and punch. The simulation result has been compared with experimental for verify.
조해용 ( Hae Yong Cho ),한기범 ( Ki Beom Han ),김관우 ( Kwan Woo Kim ),김종원 ( Jong Won Kim ),김문기 ( Moon Ki Kim ),조성열 ( Seong Yeol Cho ),이병구 ( Byung Gu Lee ),김기복 ( Ki Bok Kim ) 충북대학교 산업과학기술연구소 2010 산업과학기술연구 논문집 Vol.24 No.1
Copper tube rolling process using the planetary rolling mill has been studied by finite element method in this paper. This rolling process is that copper tube by 3-roll with mannesmass method. Also, rolling process has more advantage that make process and cost reduction than existing extrusion. This process includes various and complex process parameter. In other words, all process parameters have to be considered in copper tube rolling process. This paper performed kinematical analysis and embodiment of process through finite element analysis simulation based on plastic theory and conformed forming results in accordance with the change of process parameter. Therefore, the result prediction of copper tube rolling process through simulation is expected to reduce cost, time for the new product.