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샌드위치 구조물 내에서의 응용과 관련된 2차원 단위 셀 형상을 지닌 심재에 대한 연구
김범근(Beomkun Kim),R. M. Christensen 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The mechanical characteristics of three types of core with two-dimensional isotropic patterns-triangular, hexagonal and stare ell-were studied in applications to sandwich structures. The Young's modulus and shear modulus were calculated for the three core types in the direction normal to the faces. The compressive buckling strength and shear buckling strength were calculated by modeling each cell wall of the core as a plate under compressive or shear load. To verify this model, tests were conducted on scaled specimens to measure the compressive buckling strength of each core. The bending flexibilities of the three cores were also studied. Compliances for the three cores were measured using biaxial flexural tests. The three isotropic core patterns exhibited distinct characteristics. In the direction normal to the faces, all three cores had the same stiffness. However, the stare ell core exhibited high flexibility compared to the other cores, indicating potential for application to curved sandwich structures.
김범근(Beomkun Kim),조세현(Sehyun Cho),박정욱(Jungwook Park) 한국자동차공학회 2010 한국자동차공학회 지부 학술대회 논문집 Vol.2010 No.12
This paper investigates the effects of geometric and distribution conditions of micro dimples on the frictional behavior. Micro size circle shaped dimples, distributed in a square array, were selected as texture pattern. Laser beam is used to create various dimensions of micro dimples on cast iron surfaces. Cast iron surfaces with various dimensions of dimples were prepared to investigate the effect of micro machining on the frictional behavior. The experimental results revealed that the effect of micro machining was found more effective to reduce friction coefficients at low lubrication parameter region.