Rawlins, David S.

Steve A. Maas

English

The University of Utah: J. Willard Marriott Digital Library

www.sci.utah.edu SCI INSTITUTE ● EXHIBIT ● EXPLORE ● EXCITE             EXPERIENCE ● EXCHANGE ●  SCIFEBio: Finite Elements for BiomechanicsSteve A. Maas1, David  S. Rawlins1, Gerard Ateshian3, Benjamin J. Ellis1, Jeffrey A. Weiss1,21. Department of Bioengineering and Scientific Computing Institute, 2. Department of Orthoepdics, University of Utah, 3. Departments of Mechanical and Biomedical Engineering, Columbia University1. IntroductionFEBio is a nonlinear finite element solver that is specifically designed for biomechanical applications. It offers modeling scenarios, constitutive models and boundary conditions that are relevant to many research areas in biomechanics. FEBio implements the weak form of the governing equations of solid con-tinuum mechanics. The nonlinear finite element equations are solved im-plicitly, using a quasi-Newton method called BFGS.Figure 1. Finite element analysis of a hip implant device showing high stresses in areas of impingement.2. VerificationVerification is an important aspect of any software development project. Therefore, a large suite of over one hundred verification problems has been developed and is run every night on all supported platforms to make sure new additions to the code don’t break existing functionality. 3. Modern Software Design● Developed in C++● Support for WinXP, Win7, Linux, MAC● XML based input format● Fast parallel linear solvers (Pardiso, SuperLU, etc.)● Code documentation by Doxygen  ● Custom tensor library for easy material implementations.● Source code is open-sourceFigure 2. FE Analysis of shoulder capsule stresses during simulated clinical exam.4. SupportThe developers have placed considerable emphasis on supporting new and established users.● Online and pdf documentation of Theory Manual, User’s Manual and Developer’s Manual.● Online User’s forum where users can ask questions, report bugs and request features. Figure 3. Finite element analysis of articular cartilage pressures in the hip joint  of a normal hip during walking.5. PreView● PreView is a finite element pre-processor that was specifically designed to create FEBio input files.● Intuitive GUI-based design of FE models● Simple geometry and mesh creation● Tetrahedral meshing with Tetgen (tetgen.berlios.de)● Support for many input formats (e.g. ABAQUS, NIKE3D, LSDYNA, ANSYS, IDEAS, etc.)Figure 4. Screen shots of PreView (left) and PostView (right).6. PostView● Finite Element post-processor designed for visualizing and  analyzing FEBio results.● Uses OpenGL to create nice graphics.● Different plot types (contour, isosurface, vector, etc.)● Screen capture and animation recording capability.7. Download● All software, including FEBio source  code can be downloaded  free of charge from:  http://mrl.sci.utah.edu/software● Online documentation is available at:  http://mrl.sci.utah.edu/software/febioFinancial support from NIH grants # R01GM083925, R01AR047369 and  R01AR053344 is greatly appreciated.

FEBio: finite elements for biomechanics

https://collections.lib.utah.edu/dl_files/b8/4f/b84f5321f8580538f8a1514960c9a9f65d529b51.pdf

FEBio: finite elements for biomechanics

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The University of Utah: J. Willard Marriott Digital Library