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TWiki > Main Web>TWikiUsers > SamsonPhan > CatheterSensing>PrototypeThree (06 Apr 2009, SamsonPhan)
-- SamsonPhan - 03 Apr 2009

This prototype consists on a single piece of shim stock steel

Catheter Characteristics

  • Tip weight ~0.25 grams
  • Piezo
    • 15mm x 1mm
    • piezo material 0.25 mm
    • backing plate 0.06 mm
  • Beam
    • Composed on shim stock (probably stainless 304)
    • Beam tip: 28.34 mm
    • Thinned section:15.25 mm x 0.5 mm
    • long section: 340 mm
    • 1 mm depth
    • 2.23 mm width
    • Part width (mm) thickness (mm)
      		 length mass (calc) grams
      		spring constant K (calculated) N/m
      beam 2.23 1 340 0.63 2.74
      actuator 2.23 0.5 15.25 0.153 4727
      tip 2.23 1 28.34 0.76 3611
      material

Stainless 304 characteristics

From http://www.lenntech.com/Stainless-steel-304.htm

Properties Value Comment
Physical Properties
Density 8.03 g/cc
Mechanical properties
Hardness, Rockwell B 82
Tensile Strength, Ultimate 621 Mpa (=90100psi)
Tensile Strength, Yield 290 Mpa (=42100psi) 0.2% YS
Elongation at Break 55% in 2 inches
Modulus of Elasticity 193 Gpa tension
Modulus of Elasticity 78 Gpa torsion
Electrical properties
Electrical Resistivity 0.000116 ohm-cm 659 °C
Electrical Resistivity 7.2e-005 ohm-cm
Magenetic permeability Max 1.02 H = 200 Oersteds, Annealed
Thermal properties
CTE, linear 20°C 16.9 µm/m-°C 0 to 100°C
CTE, linear 20°C 18.7 µm/m-°C to 649°C
Heat Capacity 0.5 J/g-°C 0°C to 100°
Thermal Conductivity 16.2 W/m-K 100°C
Thermal Conductivity 21.4 W/m-K 500°C

Processing properties

Melt temperature 1371- 1399 °C

http://www.cs.wright.edu/~jslater/SDTCOutreachWebsite/damping%20properties%20of%20materials.pdf

damping ratio for steel < 0.01

 
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