http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Classification and visualization of primary trabecular bone in lumbar vertebrae
Basaruddin, Khairul Salleh,Omori, Junya,Takano, Naoki,Nakano, Takayoshi Techno-Press 2014 Advances in biomechanics & applications Vol.1 No.2
The microarchitecture of trabecular bone plays a significant role in mechanical strength due to its load-bearing capability. However, the complexity of trabecular microarchitecture hinders the evaluation of its morphological characteristics. We therefore propose a new classification method based on static multiscale theory and dynamic finite element method (FEM) analysis to visualize a three-dimensional (3D) trabecular network for investigating the influence of trabecular microarchitecture on load-bearing capability. This method is applied to human vertebral trabecular bone images obtained by micro-computed tomography (micro-CT) through which primary trabecular bone is successfully visualized and extracted from a highly complicated microarchitecture. The morphological features were then analyzed by viewing the percolation of load pathways in the primary trabecular bone by using the stress wave propagation method analyzed under impact loading. We demonstrate that the present method is effective for describing the morphology of trabecular bone and has the potential for morphometric measurement applications.
Numerical investigation on Coanda flow over a logarithmic surface
CaiYin Gan,Khairul Salleh Mohamed Sahari,ChingSeong Tan 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7
The Coanda effect has been introduced into lift generation designs. In this paper, a logarithmic spiral surface is introduced as a curvatureshape to evaluate the development of jet flow along the Coanda curvature. Moreover, 2D computational fluid dynamics numericalsimulation is adopted to measure velocity profile, jet width growth, maximum velocity decay, and surface static pressure along the curvaturesurface. A parametric study on the effect of varying exit jet heights on the Coanda effect is also presented. Results show that jetwidth grows proportionally along the curved surface, and the proportional decay of maximum velocity and surface pressure is lower thanthe atmospheric pressure. A wider exit jet height produces lower static pressure on the unmanned aerial vehicle surface and a slowermaximum velocity decay. Overall parametric analysis of varying exit jet heights shows that the effective range of d/R is 0.1 to 0.14.
Finite element analysis of proximal femur in sideways fall under quasi-static loading
Darmahssilan Subramaniam,Fauziah Mat,Mohd Shukry Abdul Majid,Khairul Salleh 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
Many researchers have investigated femur fractures using 3D models created with finite element (FE) software; however, these models need validation. Cadavers are used in experiments to validate the FE model. Nevertheless, there are several restrictions and obstacles to experimenting on the cadaver femur bone. The aim of this study was to investigate the effect of loading direction on the stress distribution and fracture risk of a proximal femur bone under quasi-static loading in a sideways fall condition. A validated 3D FE model of the proximal femur was developed by employing the results obtained from a quasi-static experimental test. Instead of cadaver, 3D-printed proximal femur bone was used. Various fall loading configurations were used to simulate a sideways fall with inclination angles from 0° to 20° and rotational angles from -15° to 15°. The highest von Mises stress is due to sideways falls distributed in the femur neck region. This study provides new information on FE model construction and medical FE analysis.