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〈응용논문〉 : 내부압력 작용하에서 자긴가공 실린더 구조의 응력거동
김학인(Hakin Gimm),강국정(Kuk Jung Kang),안상태(Sang Tae Ahn),홍석균(Suk Kyun Hong) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
압력용기와 실린더 형태의 구조설계 문제에 관한 이론과 실험적 연구는 매우 고전적인 문제임에도 여전히 연구 대상이다. 특히 군사용 포신 설계에서 자긴 가공으로 불리는 포열 두께 상에 과도변형 부여에 의한 압축 잔류응력 상태를 형성하여 포신의 허용 압력 증대와 이로 인한 피로수명을 높이는 기술은 새로운 포신 설계기술과 소재 발전에도 여전히 유효하다. 본 연구에서는 중공 장축 실린더 구조에 대해 자긴 이론에 관한 고찰과 이에 따른 수치해석을 통해 내부 압력이 작용된 실린더의 응력거동에 대해 살펴보았다. Although the efforts on theories and experimental works regarding the pressure vessels and gun tubes in cylinder are old aged issues, the subjects still remain the serviceable works to be continued in these days. Particularly the auttofrettage and overstraining for the gun tube in military use are still valid measures, even the advance in the technologies of gun and metallurgy, in order to enhance the operational performance with the improvement in fatigue life. Current work investigates the stress behaviors on the autofrettaged hollow cylinder which is subjected to an internal pressure loading, using the numerical methods as well as the review of theories
내충격 성능을 위한 알루미늄 폼재의 밀도와 기하학적 특성
김태원(Tae-Won Kim),김병조(Byoung-joe Kim),김용(Young Kim),김학인(Hakin Gimm) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Factors affecting non-uniform foam structures include wrinkled morphology, foam shape, and irregular solid structures. These factors result in different mechanical properties even though the relative densities are very much similar. The purpose of this study was to investigate the effect of different cell structures including closed and open cell types of aluminum foam on mechanical properties. Geometric factors together with relative densities have been measured by using a micro-scanning apparatus followed by voxel software simulation. The mechanical properties then have been investigated by means of either compression or tension test. The relationship between the geometric characteristics and density was discussed.
낙하충격실험을 통한 고무의 충격흡수성능과 전단계수 평가
강동환(Dong-Hwan Kang),서무열(Mu-Yeol Seo),김학인(Hakin Gimm),김태원(Tae-Won Kim) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.4
Shock absorption performances of various rubbers were investigated by using drop impact test. Several types of rubber such as NR, NBR, EPDM, SR and PUR with three respective levels of shore hardness were used for the test. As in the cases, the absorbed impact energies in rubbers were measured under seven different loads against impact energy between 5-80J. The impact absorption efficiencies of the rubbers then were evaluated by means of both single impact energy condition and summation of all impact energy applied condition. As shown in the results, PUR and EPDM have better shock absorption performances than other rubbers. Further analysis was extended to determine a shear modulus of SR through the finite element implementation with Blatz-Ko model. As can be seen, relatively higher level of absorption energy results in a decreasing shear modulus.