Different Poissons ratios

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• Different Poissons ratios
• Shear stress at interface-bonding problems

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• Less stress concentration when placed centrally

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• True only when bonded surface is perpendicular to
  loading direction
• Cartilage on bone (bonded)
• Meniscus on cartilage (not bonded)

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• Bonded case, both compressive and shear at
  interface, shear gt 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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• But, metal backed cause high interface stresses,
  so.