Shankar S, Nithyaprakash R, Santhosh B R, Uddin M S, Pramanik Alokesh
Department of Mechatronics Engineering, Kongu Engineering College, Erode, Tamil Nadu, India.
Department of Mechanical Engineering, Kongu Engineering College, Erode, Tamil Nadu, India.
Comput Methods Biomech Biomed Engin. 2020 Jun;23(8):422-431. doi: 10.1080/10255842.2020.1734794. Epub 2020 Mar 2.
Finite element (FE) simulation plays a major role in computing stress and predicting the failure of biomedical components. Normally in past, researchers focused on developing a global computational model from the scanned data of patients to analyze the stresses and deformations. To compute the wear of the hip prosthesis, mostly the global model (GM) is used to predict the expected life for million cycles using nodal updating technique which leads to high computational effort and time. The proposed work utilizes a submodeling finite element technique to analyze the contact pressure and wear of biomaterials for three different combinations in hip prosthesis including metal, ceramic and polycrystalline diamond materials. Initially the global model boundary and loading conditions are transferred to the submodel. The mesh is refined further using finer mesh and then the results are computed which consumes lesser time. The contact stress as well as the linear wear of biomaterials is found to be quite high for the local model (LM) when compared with the global model. However, no changes in volumetric wear of these biomaterials are observed when compared with previous experimental results. The computational time as well as accuracy in estimating the contact stress and the wear of bearings is improved effectively. Among local model with different element sizes, 0.75 mm element size of local model showed improved results in estimating the contact stress and linear wear of bearing.
有限元（FE）模拟在计算应力和预测生物医学部件的失效方面起着重要作用。过去，研究人员通常专注于根据患者的扫描数据开发全局计算模型，以分析应力和变形。为了计算髋关节假体的磨损，大多使用全局模型（GM）通过节点更新技术来预测百万次循环的预期寿命，这导致了高计算量和时间消耗。所提出的工作利用子模型有限元技术来分析髋关节假体中三种不同材料组合（包括金属、陶瓷和多晶金刚石材料）的生物材料的接触压力和磨损。首先将全局模型的边界和加载条件传递到子模型。使用更精细的网格进一步细化网格，然后计算结果，这消耗的时间更少。与全局模型相比，局部模型（LM）的生物材料的接触应力和线性磨损相当高。然而，与先前的实验结果相比，这些生物材料的体积磨损没有变化。有效地提高了计算时间以及估计接触应力和轴承磨损的准确性。在具有不同单元尺寸的局部模型中，局部模型0.75毫米的单元尺寸在估计轴承的接触应力和线性磨损方面显示出更好的结果。
