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유한요소해석에 의한 다공경판 리거먼트의 ASME 응력강도 계산
정종하(Jong-Ha Chung),김동옥(Dong-Ok Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
According to ASME NB-3217, membrane stress in the ligament of perforated heads shall be averaged through cross section and bending stress shall be averaged through width of ligament but gradient through plate thickness. However it has not been particularly specified for information on how to calculate them. Although a method of analysis for flat perforated plates is described in ASME Appendix Article A-8000, there are many constraints to apply this method. In this paper, a calculation method of stress intensities in perforated heads by finite element analysis is described and comparisons are shown between results from finite element analysis and analysis method of ASME Appendix A-8000.
김영진(Young-Jin Kim),정종하(Jong-Ha Chung),이정주(Jung-Ju Lee) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.12
In this paper, the algorithm of Abaqus UMAT is introduced to analyze the shape memory alloy. The SMA has two main effects which show non-linearity. Due to this, it is hard to analyze SMA using analysis tools and to describe all of two effects. Therefore, in this study, the program using Abaqus UMAT based on Modified Brinson model is used to analyze SMA. The martensite fraction, the most important factor which defines SMA motion, is also calculated by Fortran program in UMAT. In addition, the tensile test of SMA specimen is conducted. The availability of algorithm is proved by comparing analysis to experimental result.
송호석(Ho-Seok Song),정종하(Jong-Ha Chung),이정주(Jung-Ju Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Minimally Invasive Surgery (MIS) is surgery of the chest, abdomen, spine and pelvis, done with the aid of a viewing scope, and specially designed instruments. Benefits of minimally invasive surgery are less pain, less need for post-surgical pain medication, less scarring and less likelihood for incisional complications. Since the late 1980's, minimally invasive surgery has gained widespread acceptance because of the such advantages. However there are significant disadvantages which have, to date, limited the applications for these promising techniques. The reasons are limited degree-of-freedom, reduced dexterity and the lack of tactile feeling. To overcome such disadvantages many researchers have endeavored to develop robotic systems. Even though some robot aided systems achieved success and commercialized, there still remain many thing to be improved. In this paper, the robotic system which can mimic whole motions of a human arm by adding additional DOF is presented. The suggested design is expected to provide surgeons with improved dexterity during minimally invasive surgery.