Biomedical Engineering Reference
In-Depth Information
Model 1
Model 2
Model 3
Fig. 5
The 3D model of proximal femurs after assigning material properties
Material Assignment
Femur is a complicated structured material composed of compact bone and can-
cellous bone. The compact bone is anisotropic material, while cancellous bone can
be considered as isotropic material. Thus, it is difficult to assign material properties
along each direction of bone model. In our study, material is assigned to all the
models using MIMICS. In MIMICS, there are three ways to assign material prop-
erties: uniform, look-up file, and mask. We have considered the uniform method for
realistic material assignment to each model using MIMICS. In this study, ten
materials are assigned to each model and gray values are calculated for each
material before realistic material assignment. Figure
5
shows all three models
assigned with materials in MIMICS.
FE Analysis
The 3D FE Models of femur bone with volumetric mesh and realistic material
assigned are imported into ANSYS v14. Since the femur bone models are
nonlinear, asymmetric, and curved in all three planes, models are first imported in
FE Modeler and then transferred to static structural module in ANSYS for FEA.
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