Using Simpleware with Abaqus

Example of a mesh generated using Simpleware software

Abaqus users wanting to obtain high-quality volume meshes for FE and CFD analysis can do so using Simpleware software. Our software converts 3D image data (MRI, CT, Micro-CT…) into models suitable for CAD, FEA, CFD and 3D printing. Volume meshes can be generated for FE and CFD analysis from segmented image data with conforming interfaces and shared nodes, and exported in a dedicated Abaqus format for analysis.

Meshes can also be assigned FE information (e.g. contact surfaces, node sets, shell elements), and CFD information (e.g. inlets/outlets, solid/fluid regions). CAD objects can be integrated with image data to create multi-part meshes, and material properties assigned from grayscale data, enabling a direct route from scan to Abaqus.

Our software is used by Abaqus researchers working in the Life Sciences, Materials Science, Oil and Gas Exploration, and Industrial NDE sectors, with applications such as evaluating biomechanical processes, characterizing microstructures, and exploring fluid flow through materials.

Evaluating Bone Strain in the Patella

From image processing to mesh generation & analysis in Abaqus

One example of how Simpleware software and Abaqus have been combined involved analyzing bone strain in the patella, with work carried out at the Center for Orthopedic Biomechanics, University of Denver by C.K. Fitzpatrick, P.J. Rulkoetter, and P.J. Laz.

The goal of the project was to investigate patellofemoral complications, including fracture and pain, in total knee replacements, by researching interactions between subject-specific models and implants. Finite Element (FE) models were generated to evaluate patellofemoral mechanics and bone strain distribution in Abaqus.

Data was obtained from MRI scans and CT, and imported to Simpleware image processing platform ScanIP for visualization and segmentation into femoral, tibial, patellar bone and cartilage regions; material properties were also assigned to regions in the software based on CT data. A robust FE mesh was then generated for testing conditions for implant and unresurfaced conditions in Abaqus, which involved creating an implanted model with a size-matched patellar button.

Analysis of peak compressive strains in Abaqus

Loads were applied to the heads of the quadriceps muscle, and contact mechanics and distribution of bone strain evaluated through the flexion cycle in Abaqus/Explicit. Peak compressive principal strains were found in the softer cancellous bone in natural specimens, and medially within implanted specimens, with differences in strained volumes observed at different levels of flexion.

This case study is one of many using Simpleware software and Abaqus. You can find more on our Simulia partner page - http://www.3ds.com/products-services/simulia/alliances/software-partners/simpleware-ltd/ and our website www.simpleware.com.

You can also download a free 30-day trial of the software at our site.

We’ll be attending the Simulia Community Conference in Providence, RI., from May 20-22. Meet with us during the conference to discuss your workflow for converting scan data into 3D models for Abaqus. Learn more here: http://simpleware.com/news-and-events/events/conferences/scc2014.html.