Mechanical simulation analysis of static finite element
models of the femur with different material assignments

doi:10.3969/j.issn.2095-4344.2511

Abstract

Abstract:

BACKGROUND: Different bone materials have different properties. Therefore, to simplify the model and improve the analysis efficiency in biomechanical analysis, many scholars have adopted different assignment methods to the bone model in the biomechanical simulation research. The distribution of material properties will have a great influence on the results of biomechanical analysis.

OBJECTIVE: Three kinds of finite element models of the femur were established by different material attribute assignment methods, and the finite element simulation analysis was carried out to explore the influence of different material assignment methods on the biomechanical simulation analysis of femur finite element.

METHODS: Volunteer femur CT scanning data were collected and imported into Mimics medical image processing software in DICOM format to reconstruct the femur model. Three different material attributes were assigned to the models, including uniform material assignment, skin cancellous bone assignment and gray scale assignment. The models were imported into finite element analysis Abaqus 6.14 software to set the same load and boundary conditions for stress and displacement analysis.

RESULTS AND CONCLUSION: (1) The stress values of the three kinds of models differed slightly and were all in a reasonable range. (2) Whereas, the maximum stress of homogeneous assigned model and the model assigned according to cortical-cancellous bone assembly model mainly distributed in the diaphysis region, while the maximum stress distributed in the femoral neck region for the gray value assigned model. (3) The displacement value of cortical-cancellous bone assigned model was essentially in agreement with the gray value assigned model. The homogeneous assigned femoral model possessed the minimum displacement value and the value was about 40% different from the other two models. (4) The grayscale method can better reflect the biomechanical characteristics of human femur, so as to more accurately simulate the real biomechanical characteristics of real femur, which also provides an important theoretical basis for the finite element simulation modeling of orthopedic biomechanics.

Key words: femur model, material assignment, finite element simulation, stress, displacement, digital orthopedics, biomechanics

CLC Number:

Yan Jiying. Mechanical simulation analysis of static finite element models of the femur with different material assignments[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(9): 1390-1394.

Figures/Tables 5

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