Biomech-Bone_Tissue_Mechanics-Lecture

Biomech-Bone_Tissue_Mechanics-Lecture - Bone Mechanics...

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Bone Mechanics 14:125:208 Introduction to Biomechanics
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Bone Mechanics: Overview Bone is a naturally anisotropic material It exhibits different mechanical properties in different directions The composition and loading response of hard cortical and spongy trabecular bone differ greatly There are different testing protocols to accurately characterize the tissue
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Bone Mechanics: Overview Bone is designed to perform best under compression (there are exceptions) Certain bones also experience tension (due to bending – a combination of tension and compression)
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Bone Mechanics: Overview Cortical Bone (from tensile or compressive tests) Tensile Strength: 124-175 MPa % Elongation: 1.4-1.5 Elastic Modulus (Tension): 17.6-30 GPa Compressive Strength: 170-200 MPa % Contraction: 1.85
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Bone Mechanics: Overview Cortical Bone (from tensile or compressive tests) Elastic Modulus (Compression): 4 – 27 GPa Shear Modulus: 2-9 GPa Shear Strength: 50-70 MPa Torsional Modulus: 3.2 GPa Poisson’s Ratio: 0.08 - 0.45
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Bone Mechanics: Overview Properties for trabecular bone change with Anatomical location Type of loading Bone density Species of donor
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Bone Mechanics: Overview Trabecular bone (from tensile or compressive tests) Elastic Modulus (Tensile): 1-10 GPa Elastic Modulus (Compression): 9-11.38 GPa Compressive Strength: 7-180 MPa Poisson’s ratio: n = 0.01 - 0.64
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Bone Mechanics: Overview Whole bone properties Long bone (human femur) Elastic Modulus: 4.4 GPa Tensile Strength: 135 MPa Compressive Strength 205 MPa Compressive Modulus: 10.8 GPa
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Bone Mechanics: Overview Whole bone properties Skull (Flat) Tangential Direction: Elastic Modulus: 5.6 GPa Tensile Strength: 48 MPa Compressive Strength 96 MPa Radial Direction Elastic Modulus: 2.4 GPa Tensile Strength: 37 MPa Compressive Strength: 74 MPa
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Bone Mechanics: Overview Modulus is dependent on porosity and mineral content
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Bone Mechanics: Overview Bone is actually made up of 2 materials with the same components but different structures Cortical bone Dense Trabecular bone Porous (spongy) You can test each separately or test them together
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Bone Mechanics: Testing Mechanical tests: Different methods are typically used to test the mechanical properties of bone Tensile Compression 3 point bending 4 point bending Torsion Indentation Micro/Nanoindentation Ultrasonic Finite Element Modeling (FEM)
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Bone Mechanics: Testing
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Biomech-Bone_Tissue_Mechanics-Lecture - Bone Mechanics...

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