Characteristics:

• 3D FE models from X-ray CT images
• Segmentation of solid and porous regions
• Generation of an analysis ready volume mesh
• Simulation of stress-strain responses for porous samples in COMSOL Multiphysics®
• Development of a workflow for future modelling

Image Processing

Figure 1: Imported CT scans in ScanIP showing pores (red) and solid (green)

       A stack of X-ray computed tomography images were imported into ScanIP. 2D slices were immediately rendered in 3D after import, and rapidly segmented using automated thresholding tools into solid and porous regions. Segmentation was carried out based on greyscale scan values. Colour mapping was also used to better visualise porous and solid regions.

Mesh Generation

Figure 2: Solid model of solid part of model

     Simpleware +FE was then used to convert the solid part of the segmented image data into a robust, analysis-ready mesh. Experiments were conducted with FE Grid and FE Free options to obtain an optimum mesh quality with sufficient elements for a high resolution model. Efforts were also made to maintain a reasonable computing time when meshing. The final volume mesh was directly imported into COMSOL Multiphysics® for simulation.

Mesh Generation

Figure 2: Solid model of solid part of model

     Simpleware +FE was then used to convert the solid part of the segmented image data into a robust, analysis-ready mesh. Experiments were conducted with FE Grid and FE Free options to obtain an optimum mesh quality with sufficient elements for a high resolution model. Efforts were also made to maintain a reasonable computing time when meshing. The final volume mesh was directly imported into COMSOL Multiphysics® for simulation.