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BioHorizons_MidtermPP_Fall06

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  • Expensive to machine Bearings (maintenance) Small error in load cell reading due to the bearing friction Angle of applied force will be less reliable Complicated – many possible places for failure Expensive to machine Bearings (maintenance) Small error in load cell reading due to the bearing friction Angle of applied force will be less reliable Complicated – many possible places for failure Expensive to machine Bearings (maintenance) Small error in load cell reading due to the bearing friction Angle of applied force will be less reliable Complicated – many possible places for failure Expensive to machine Bearings (maintenance) Small error in load cell reading due to the bearing friction Angle of applied force will be less reliable Complicated – many possible places for failure Expensive to machine Bearings (maintenance) Small error in load cell reading due to the bearing friction Angle of applied force will be less reliable Complicated – many possible places for failure Expensive to machine Bearings (maintenance) Small error in load cell reading due to the bearing friction Angle of applied force will be less reliable Complicated – many possible places for failure Expensive to machine Bearings (maintenance) Small error in load cell reading due to the bearing friction Angle of applied force will be less reliable Complicated – many possible places for failure
  • Transcript

    • 1. BioHorizons Fatigue Test System
      • Corp 3
      • Midterm Concepts Presentation
    • 2. Team Members
      • Jonathan Hill
      • John Maddox
      • Allen Lindsay
      • Crichton Neal
      • Chris Howell
      • Felicia Craig
      • Bradley Johnson
    • 3. Project Overview
      • General Specification
      • ISO Standards
      • Primary Concept
        • Solid Edge
        • Advantages/Disadvantages
        • Water Bath
        • Economic Analysis
      • Secondary Concept
      • Phase II
    • 4. Specifications and Constraints
      • General Constraints
        • small and light enough to operate on a tabletop
        • clean and quiet enough to operate indoors at the BioHorizons offices
        • Able to perform fatigue tests as well as static load tests
        • Control system and sensors must measure failure load and cycles to failure and discontinue operation at this point
        • Entire system must be able to be calibrated accurately enough for continuous operation within ISO 14801 specifications and constraints
      • Economic Constraints
        • to produce a fatigue testing machine that can be reproduced and used for less than it currently costs to have the dental implants tested from an outside company
    • 5. ISO Standards
      • ISO provides more specific specifications and constraints in ISO 14801 —Dentistry—Fatigue test for endosseous dental implants
      • Several of the more pertinent specifiations are covered below, obtained from the ISO document:
        • The testing machine should be capable of applying the specified load with an error not exceeding ± 5% at maximum load.
        • The endosseous dental implant shall be clamped such that it makes a 30° ± 1° angle with the loading direction of the testing machine.
        • The device shall clamp the specimen at a distance 3.0 mm ± 0.1 mm apically from the nominal bone level as specified in the manufacturer’s instruction for use.
    • 6. ISO Standards (continued)
      • More constraints and specifications:
        • The dimensions of the loading member shall be chosen to define a distance l = 11.0 mm ± 0.1 mm from the centre of the hemisphere to the clamping plane.
        • For endosseous dental implants that include materials in which corrosion fatigue has been reported or is expected to occur…testing shall be carried out in water of Grade 2 according to ISO 3696, in normal saline [.09%]* or in physiologic medium. The fluid and the test specimen shall be kept at 37°C ± 2°C during the testing.
        • Fatigue testing shall be carried out with a unidirectional load. The load shall vary sinusoidally between a nominal peak value and 10 % of this value . The loading frequency shall be ≤ 15 Hz . Testing in liquid media shall be conducted at frequencies ≤ 2 Hz .
      *As specified by BioHorizons
    • 7. Other Applicable ISO Standards
      • ISO 1099 : Metallic materials—Fatigue testing—Axial force controlled method
      • ISO 1942-1 : Dental vocabulary—Part 1: General and clinical terms
      • ISO 3696 : Water for analytical laboratory use—Specification and test methods
      • ISO 4965 : Axial load fatigue testing machines—Dynamic force calibration—Strain gauge technique
      • ISO 7500-1 : Metallic materials—Verification of static uniaxial testing machines—Part 1: Tension/compression testing machines—Verification and calibration of the force- measuring system
    • 8. Concept Overview
    • 9. Different Views
    • 10. Exploded View Temperature Sensor Liquid Bath Container (Pyrex) Washer (Rubber) Container Base Linear Motor/Load Cell Frame (steel) Thumb Screw Insert (will be tapped to hold test piece) Mounting Screws Base (steel) Exploded View
    • 11. Advantages
      • Long life
      • Excellent precision and reliability
      • Ease in varying load and frequency
      • Low maintenance
      • Easy setup
      • Small number of parts
      • Conduct static and fatigue tests without changing setup
    • 12. Disadvantages
      • Initial costs are high
      • Replacement parts would be high
      • Possible motor cooling may need to be addressed
      • Different inserts need to be tapped for each implant tested
    • 13. Water Bath
    • 14. Major Components
      • Heating element
        • Small and compact
        • Low fluid volume rated
      • Temperature switch
        • Small and compact
        • +-2 °C tolerance
      • Dish
        • Metal bottom
        • Glass sides
        • Water tight
      • Water level switch
        • Small and compact
        • Safely maintain water level
    • 15. Dish
      • Metal base
        • Base for mounting heating components
        • Able to drain the dish through a ball valve
      • Glass tube
        • Forms sides
        • Able to withstand high temps incase of heating problems
        • Able to see the test specimen during testing
      • Washer
        • Or sealant as of yet to be determined
        • Seals the base to the glass
    • 16. Standards
      • ISO 14801:2003
        • 5.4 Testing Environment
          • testing shall be carried out in water of Grade 2 according to ISO 3696
          • fluid and the test specimen shall be kept at 37 °C+2°C or -2 °C
    • 17. Heating Element
      • Compact Cartridge-Style Immersion Heater
        • 1 5/8" long type 316 stainless steel element
        • Maximum temperature of 100° C
        • CSA Certified and UL-Registered
        • Can be fully immerged in saline solution
    • 18. Temperature switch
      • Submersible Cartridge Temperature Switch
        • Operates as a thermostat
        • 300 series stainless steel outer shell
        • adjusted between -73° and +315° C
        • 2” long element
        • UL-Registered
      • Search continues to refine this component
    • 19. Water Level Switch
      • Vertical-Mount Liquid-Level Switch
        • Maintain a safe water level for the Immersion heating element
        • Over all length of 1 7/8“
        • Max temperature rating of 105°C
        • When the fluid level drops too low
          • cut power to the heating element
          • turn on a warning light or trigger a system warning in the testing program letting the tester know to add more fluid
    • 20. Linear Servo Motor
      • Handles static loading up to 500 lbf.
      • Handles a cycling load from 0 to 150 lbf. at a rate up to 15 Hz
    • 21. Load Cell
      • Piezoelectric sensing cell
      • Highly repeatable
      • Fatigue Rated load cell
      • Low profile to fit easily within machine
    • 22. Controls
      • Load cell sends a signal through a DAQ card to LabView
      • LabView takes the data and depending on the load it will send a signal to the Driver which will in turn increase or decrease the current
    • 23. Economic Analysis
      • Linear Motor, Cooling Jacket, Controller, and Driver : $19600
      • Load Cell : $1000
      • Lab View : $1200 per year
      • Jig Frame and Base : $2000
      • Computer : $600
      • Heating Accessories : $300
      • Cables and Connectors : $200
      • Total Costs : $25000
    • 24. Alternative Design
    • 25. Advantages
      • Cheap saline bath container
      • Rotary motor is cheaper than linear motor
    • 26. Disadvantages
      • Bearings (maintenance)
      • Expensive to machine
      • Small error in load cell reading due to the bearing friction
      • Angle of applied force will be less reliable
      • Complicated – many possible places for failure
    • 27. Phase II-Completed by Dec.
      • Obtain more quotes on linear motors
      • Dimension Concept
      • Stress Analysis
      • Finalize Concept

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