Abstract
This paper presents the development and experimental verification of a generative CAD/FEM model of an external bone fixation device. The generative CAD model is based on the development of a parameterized skeleton algorithm and sub-algorithms for parametric modeling and positioning of components within a fixator assembly using the CATIA CAD/CAM/CAE system. After a structural analysis performed in the same system, the FEM model was used to follow interfragmentary fracture displacements, axial displacements at the loading site, as well as principal and Von Mises stresses at the fixator connecting rod. The experimental analysis verified the results of the CAD/FEM model from an aspect of axial displacement at the load site using a material testing machine (deviation of 3.9 %) and the principal stresses in the middle of the fixator connecting rod using tensometric measurements (deviation of 3.5 %).The developed model allows a reduction of the scope of preclinical experimental investigations, prediction of the behavior of the fixator during the postoperative fracture treatment period and creation of preconditions for subsequent structural optimization of the external fixator.
Highlights
With regard to the organization of models and the application of modern technologies, the design process should be based on the widespread use of computer support in all its stages, i.e. it should be based on the principle of simultaneous design
It is often necessary to represent some physical form using unambiguous expressions. These relationships should mathematically describe the geometric shape of an associated 2D or 3D continuous physical shape using scalar parameters
The geometric shape is described by parametric equations and a set of scalar parameters, enabling its visualization, simulation of the interaction of the shape with the environment and geometric transformations
Summary
With regard to the organization of models and the application of modern technologies, the design process should be based on the widespread use of computer support in all its stages, i.e. it should be based on the principle of simultaneous design All this leads to the fact that it is necessary to develop a computer model of products that will meet the requirements defined by a systematic approach to design. The developed parameterized model of the external fixator should meet the following requirements: the geometry of the model should as closely as possible map the geometry of the real fixator to enable the FEM analysis and structural optimization; rapid change of geometry parameters in order to form different fixator configurations; parametric modeling approach based on technical elements with as few design parameters as possible; regularity check of fixator design; analysis of elements loading and stress-strain states using appropriate solver and associativity. Prior to the fixator parameterization process, the following activities were performed: the fixator configuration complexity check, development of the fixator model design plan, definition of basic independent and dependent parameters, as well as establishment of the most efficient method of the fixator parameterization
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