Different Poisson’s ratios Shear stress at interface-bonding problems.
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Transcript of Different Poisson’s ratios Shear stress at interface-bonding problems.
![Page 1: Different Poisson’s ratios Shear stress at interface-bonding problems.](https://reader035.fdocuments.net/reader035/viewer/2022062421/56649d7a5503460f94a5e178/html5/thumbnails/1.jpg)
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• Different Poisson’s ratios• Shear stress at interface-bonding problems
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• Less stress concentration when placed centrally
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Load-Transfer
• Affected by bonding characteristics at interface– Frictional/adhesive characteristics– Orientation of interface relative to loading
direction– Surface microstructure/texture
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• True only when bonded surface is perpendicular to loading direction
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• Bonded case, both compressive and shear at interface, shear > compressive for small angles
• Press-fit, get a tensile hoop stress in bone to prevent expansion, and maintain equilibrium-abnormal loading
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• Rigidity of stem affects– Bone stresses (may cause resorption)– Interface stresses (may cause loosening)
• Non-cemented stems tend to be canal filling and thicker---hence….(more stiff, more stress shielding)
• Bone stiffness-VERY IMPORTANT
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SENIOR DESIGN??