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The biomechanical effect of the collar of a femoral stem on total hip arthroplasty
Insu Jeon(전인수),Ji-Yong Bae(배지용),Jin-Hong Park(박진홍),Taek-Rim Yoon(윤택림) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
To investigate the biomechanical effect of collars, finite element analyses are carried out through two hip joints that are implanted using collared and collarless stems, respectively, and an intact hip joint model. For the analyses, biological materials, such as, the sacrum, coxal bone, and the cancellous and cortical bones of a femur, are reconstructed based on X-ray CT images taken from a 27-year-old woman. The geometric solid models are fabricated using the reconstructed models. For the solid models of hip joint prostheses, CAD data of the PerFix collarless and collared prostheses of Japan Medical Materials Co., Ltd. are used. The finite element models are constructed on the solid models and then, the computations are carried out considering an applied load of 1647.5N, which is three times of the woman’s weight. From the results, it is found that a collar with perfect calcar contact prevents stem subsidence and decreases the proximal lateral gap and the lateral tilting of the stem. Therefore, it can impart reasonable biomechanical stability for THA. However, its low load transmission ability and increased stem tilting effect due to the imperfect contact between the collar and the calcar are found to be serious problems that need to be solved. Results of clinical follow-up are presented for supporting the computational results.
Higher Order Eigenfields in Mode Ⅱ Cracks Under Elastic-Plastic Deformation
Insu Jeon,Yongwoo Lee,Seyoung Im 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.2
The explicit formulation of the J-integral and the M-integral is constructed in terms of the stress intensity factor and the higher order stress coefficients for Mode II cracks under small or large scale yielding. Furthermore, the stress intensity factor and the higher order stress coefficients as well are computed with the aid of the two-state J-and the M-integral, which is found to be accurate and efficient. It is found that the contribution from the higher order singularities to the J-integral is closely related to the configuration of the plastic zone.<br/>
Cell wall mechanical properties of closed-cell Al foam
Jeon, Insu,Katou, Kiyotaka,Sonoda, Tsutomu,Asahina, Tadashi,Kang, Ki-Ju Elsevier 2009 Mechanics of materials Vol.41 No.1
<P><B>Abstract</B></P><P>The mechanical properties of the cell wall, such as the elastic modulus, 0.2% offset yield stress and power-law hardening exponent of the closed-cell Al foam are determined using both experimental measurements and finite element analyses. A 6×6×12cm<SUP>3</SUP> ingot of the cell wall base material, which is sampled from melted Al-1.5wt.%Ca alloy before foaming, is prepared, and its mechanical properties are initially measured to set the limit values of the mechanical properties of the Al cell wall. Two 5×5×5mm<SUP>3</SUP> Al foam specimens of completely different structures are fabricated, and directly modeled for the finite element analysis by using a microfocus X-ray CT system, 3D reconstruction program, 3D scanned data processing software, and commercial mesh generation program. Subsequently, uniaxial compression tests are carried out on the specimens, and the numerical simulations of these tests are performed using the finite element models. For the simulations, various mechanical properties for the cell wall selected from the measured properties of the base material are used. Then, the Al cell wall mechanical properties are precisely determined by comparing the computed force–displacement curves with the measured ones. Finally, the effects of each mechanical property on the compressive behavior of the foam material are analyzed.</P>
닫힌 셀 구조 Al 발포 재료의 압축 거동에 대한 수치해석
전인수(Insu Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The finite element method is applied to analyze the deformation mechanisms in the closed-cell Al foam under the compression. The modeling of the real cellular structure proceeds with the concept of the reverse engineering. First of all, the small, 10×10×10㎣ sized specimens of the closed-cell Al foam are prepared. The micro focus X-ray CTsystem of SHIMADZU Corp. is used to scan the full structures of the specimens. The scanned structures are converted to the geometric surfaces and solids through the software for 3-D scan data processing, RapidFormTMof INUS Tech. Inc. Then the solid meshes are directly generated on the converted geometric solids for the finite element analysis. The large elastic-plastic deformation and 3-D contact problems for the Al cellular material are considered. The clear and successful analysis for the deformation mechanisms in the closed-cell Al foam is carried out through the comparison of the numerical results in this research with the referred experimental ones.