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Title Biomechanical study of a drop foot brace
Author í Skorini, Ragnhild
Supervisor Mikkelsen, Lars Pilgaard (Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Løgstrup Andersen, Tom (Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2010
Abstract The objective of this study was to make parametric study of a drop foot brace also called ankle foot orthosis (AFO). A person specific AFO was made by vacuum infusion and 3D-scanned. The scan gave a orphan mesh that represented the inner surface of the AFO. The stl-file was imported to a commercial FE-code software Abaqus. Two models were be created, a full model was made from the orphan mesh, and a simplified model of the lateral rod was made. The lateral rod model was converted to a geometric part via the commercial CAD software CATIA V5. The material parameters were found by tensile testing the materials that are used in the AFO. The material parameters that could not be found from the tests are estimated from literature. Five designs of the models were made, where different type of fiber reinforcement in the rods were used. All models were fixed in the bottom and the top was displaced 30 mm in frontal direction to simulate the stance phase in normal gait. Failure criteria for the reinforcement materials were assigned according to failure strains. The physical AFO was tested with four strain gauges. One test person loaded the AFO in different positions while the sole was fixed. The results show that the model is realistic and can be used to predict material failure of different layups of materials.
Imprint Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi : Roskilde
Pages 94
Keywords Materialer og energilagring; Materials and energy storage; Lette stærke materialer til energiformål; Light strong materials for energy purposes
Fulltext
Original PDF Master2010_Biomechanical_study_of_a_drop_foot_brace.pdf (3.95 MB)
Admin Creation date: 2010-11-18    Update date: 2011-01-20    Source: dtu    ID: 269082    Original MXD