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Functions

MECHANICAL FINDER has following major functions.

CT-based 3D Modeling

3D bone model can be constructed by extracting ROI(Region of Interest) on imported DICOM data or a series of image file(BMP, JPEG, or TIFF).
mf_ct_data.png
Imported CT data
Extracted 3D model

Implant Installation

Geometry (STL file format) such as an implant can be imported.
Position of an implant can be modified while displaying CT image.

*The function of geometry import is equipped only in Extended Edition.
Positioning of stem in femur
Display with CT image(left) imported(right)

Automatic Mesh Generation

Mesh generation can be performed with only setting of mesh size with accuracy even for complicated models such as implant-installed model.

Finite Element model

Inhomogeneous Material Properties

Bone has been modeled as homogeneous or 2-layered material in analysis.
MECHANICAL FINDER can build it as an inhomogeneous material reflecting CT value.
Then element on cortical bone(high density) has hard material property, on the one hand element on cancellous bone(low density) has soft one.
To convert CT value to density strictly bone density calibration phantom can be used.

Cross-section contour of Young's modules(femur)

Evaluation of Stress or Fracture

Stress of strain can be evaluated by elastic analysis.
Additionally plasticity, crush and clack of element can be treated by material nonlinear analysis to evaluate fracture line and load.
Results or material properties of designated area can be extracted in numerical data. Extracted data can be output in CSV file format.
mf_stress.jpg
Contour map of equivalent stress
Fracture map(femural neck)

Contact Analysis

Contact condition can be applied at the interface between two materials such as bone and implant.
Depending on analysis model, contact condition enables realistic stress distribution.

*Contact conditon can be set only in Extended Edition.
mf_bolt.jpg
Countour map of maximal princpal stress of bonded model(left) and contact model(right).

Friction Analysis

In contact analysis friction coefficient can be set at contact suface.

*friction coefficient can be set only in Extended Edition.
mf_bolt.jpg
Contact force of model without(left) and with(right) friction.

Geometrical nonlinear analysis

Adding to analysis based on infinitesimal deformation theory, geometrical nonlinear analysis na be performed.
Soft tissue capable of large deformation can be modeled as hyperelastic material.


*Geometrical nonlinear analysis is equipped only in Extended Edition.
mf_large_s.jpg
Click image to see the video

Dynamic Analysis

Shock analysis or analysis with inertial force can be performed by dynamic analysis.

*Dyanamic analysis is equipped only in Extended Edition.
Click image to see the video
mfdynamic.mpg
Click image to see the video

High-performance Solver

PARDISO for direct method and GPGPU for iterative method is used for matrix solver to analyze faster.

*Graphic card available for double-precision operation manufactured by NVIDIA is neccesary for GPGPU solver.
HPC_500.jpg
Current solver analyzes faster than previous one(before version 6.1).

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