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Tensile testing

Structural Properties Load Deformation Stiffness Ultimate load Ultimate elongation These properties are dependent on cross-sectional area and length of specimen. Mechanical Properties Strain energy density Modulus Ultimate strain

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Tensile testing

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  1. Structural Properties Load Deformation Stiffness Ultimate load Ultimate elongation These properties are dependent on cross-sectional area and length of specimen Mechanical Properties Strain energy density Modulus Ultimate strain These properties are independent of CSA and length (i.e. same no matter what geometry is tested Tensile testing

  2. Influences on testing • Gripping (freeze clamps) • Strain Rate • Age • Temperature • Hydration • Immobilization

  3. Freeze clamps • Also called cyrojaws. • Use liquid N2 to freeze • Must maintain freeze line

  4. VDA • Video extensometer • Local strains

  5. Influences on testing • Gripping (freeze clamps) • Strain Rate • Age • Temperature • Hydration • Immobilization

  6. Strain rates • Avulsion versus mid-substance- • Some theorize that these effects are due to strain rate, but REALLY depends on Age.

  7. Influences on testing • Gripping (freeze clamps) • Strain Rate • Age • Temperature • Hydration • Immobilization

  8. Mature versus immature, but then look at mature versus OLD

  9. Age • Puberty-adult see an increase in ult. Load • Open epiphysis-avulsion • Closed epiphysis (skeletally mature)-midsubstance • Old-usually avulsion • Stiffness decreases with age • Ultimate load decreases with age • -see plot

  10. Influences on testing • Gripping (freeze clamps) • Strain Rate • Age • Temperature • Hydration • Immobilization

  11. Temperature • Increase temp-decrease stiffness • Race horses • Tennis shoes

  12. Influences on testing • Gripping (freeze clamps) • Strain Rate • Age • Temperature • Hydration • Immobilization

  13. Waterbath

  14. Influences on testing • Gripping (freeze clamps) • Strain Rate • Age • Temperature • Hydration • Immobilization

  15. How do we properly store a specimen for transplantation? • Freezing effects?? • Irradiation?? Disease transmission

  16. Pre-tension on graft

  17. Influences on testing • Gripping (freeze clamps) • Strain Rate • Age • Temperature • Hydration • Immobilization • Exercise

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