Orthopaedic Biomechanics Laboratories

Biomaterials Testing Laboratory

This laboratory is used for experiments which study the properties of biological materials. Below is a list of the equipment used in this lab.

1. Servo-Hydraulic Testing Machine

  • Used to examine the physical strength of biological materials.
  • Can produce computer-controlled displacements or forces of almost any desired shape and duration.
  • Capable of producing 50ms sinewave load and position-controlled impacts of 13.0 kN.
  • Data can be analyzed to produce force-time and force-displacement curves, as well as calculate stiffness, Young's modulus and yield strength
 

2. Torque Testing Machine

  • Provides torque moment or rotational movement to an object using load cell of either 25 inch/lbs or 200 inch/lbs
  • Uses optical rotary encoder to measure rotary motions.
  • Used to evaluate surgical equipment and procedures, as well as bone repair methods and materials.
  • Used to determine failure torque, energy and stiffness of these materials

3. High-Speed Pneumatic Impacter

  • Can produce an impact of up to 35 mph to simulate a car crash or other high speed impact injury.
  • Uses high-pressure nitrogen to fire a piston, accelerating an impact mass toward the target object.
  • Initial velocity of the impact mass is measured with an optically triggered speed trap. The impact forces are measured with an inertially compensated load cell.
  • Used to test the response of tissues and bones to high-speed impacts.
  • Results are used to design cars, helmets and other safety equipment.

4. Hyperextension Fixture

  • Custom designed to test behavior of specimens under loads while allowing rotation.
  • Used in conjunction with the XY table to simulate tensile or compressive stresses
  • Used in research to analyze the mechanical behavior of knee joints when forces similar to those experienced in nature are applied.

5. Stainless Steel XY Table

  • Allows researcher to exert tensile or compressive forces in Z-direction while allowing free movement in the X and Y directions.
  • Can be mounted on the Instron testing machine, where data can be captured and the XY displacement data from the table can be synchronized.
  • Table's position can be measured to 1/1000 of a millimeter and can be read at 10,000 samples per second.
  • Y Axis can be fixed in order to measure any loads in Y direction.

6. Aluminum XY Table

  • Allows researcher to exert tensile or compressive forces in Z-direction while allowing free movement in the X and Y directions.
  • Can be mounted on the Instron testing machine, where data can be captured and the XY displacement data from the table can be synchronized.
  • Table's position can be measured to 1/1000 of a millimeter and can be read at 10,000 samples per second.
  • Smaller, designed for lighter loads than the stainless steel XY Table

7. Rotary Encoders

  • Available with a resolution of 0.02 degrees, sampled at up to 10,000 samples per second.
  • Data from encoders, XY Table and Instron can be synchronized.
  • Used to measure angular motions
  • Experiment shown on the right uses two encoders to calculate the bending moment at the joint.
 


Orthopaedic Biomechanics Laboratories
Attn: Dr. Roger Haut
East Fee Hall
965 Fee Road, Room A-407
East Lansing, MI 48824
phone:(517) 355-0320
email: haut@msu.edu

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