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일방향 케블라/에폭시 복합재 튜브의 축방향 압괴 거동의 해석 및 시험적 연구
김형욱(Kim Hyung-Uk),김정석(Kim Jung-Seok),정현승(Jung Hyun-Seung),권태수(Kwon Tae-soo) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
In this paper, an analysis model for a kevlar/epoxy tube to be used as an energy absorbing component has been developed and then verified the results through experiment. The 2D shell element and Chang-Chang failure criterion of LS-DYNA that is commercial explicit FE code was used. Mechanical material properties for the model were obtained by material testing in advance. The numerical results were compared with quasi-static test results under axial compressive loading at 10㎜/min. From the results, force-displacement curve was very close to the experiments and SEA showed a good agreement with experimental one within less than 5 percent.
Pre-strain과 sensor extending을 활용한 미소 변형에서 높은 민감도를 갖는 변형 센서 제작
Hyun Suk Jung(정현석),Chan Park(박찬),Hyun Woo Lee(이현우),Seong Uk Hong(홍성욱),Hyong Uk Kim(김형욱),Cheol Jeong Park(박철정),Seong Kyung Hong(홍성경),Seong Jin Cho(조성진) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Measuring pulse wave technology has received great attention because it indicates the status of the heart and blood vessels. For measuring precise pulse wave, high sensitivity (gauge factor〉500) at low deformation (〈1% strain) and repeatability are necessary. Because a pulse of blood causes micro-scale deformation of skin, high sensitivity sensor is required to measure the small deformation. However, other studies are low sensitivity under 1% strain and poor hysteresis that makes unreliable repeatability. Here, we fabricated a crack-based strain sensor that has high sensitivity (Gauge Factor〉2,000) at low strain (〈1% strain) with pre-strain (P.S) and sensor extending (S.E) process. We can also control sensitivity and linearity through P.S and S.E as needs.