Materials Selection - Key Questions To Ask...

• Is the material available?  Where?

• At what cost

• Will the required stock shapes be available

• Temperatures, normal use and peak + likely durations at each

• Pressure / Vacuum levels, normal use and peak + likely durations

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• Environment - dry / moist / ...

• Nature of loads, magnitude, and duty cycle - Tensile, Compressive, Bending, Shear, or combination.  
    Impact / Steady, or Cyclical?

• Mating part materials, composition, hardness, surface morphology, surface treatments...

• Attachment points and means

• Presence of crevices

• Allowable deflections, and or rotation

• Permissible failure modes / mechanisms

• Dimensional stability required - short term, and long term

• Frequency of assembly and disassembly

• Insulation / isolation requirements - Thermal, Electrical, RF, Magnetic

• Impact or exposure to skin, or any other such interactions with eyes, nose, etc. 

• Stability of microstructure 

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• Internal stresses from prior shaping processes 

• Weldability

• Formability (hot / cold)

• Strain hardening

• Volume / usage

• Machinability

• Available surface finishes in stock sizes

• Hardness and micro structure

• G forces, and nature (one time vs. cyclical)

• Moisture

• Temperature extremes during transit

• Particulates in air / environment

• Weight

• How will the product be disposed off

• Should it be re-cycled

• Potential for leaching / other types of contamination with the disposal methods used