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Material selection for vehicle leaf spring

  1. Nov 22, 2016 #1
    1. The problem statement, all variables and given/known data
    I've gone though a material selection process to pick the optimum material for a rear leaf spring suspension for a vehicle (~700mm long) and I've selected the top 10 materials based on fatigue, fracture, toughness, cost, yield etc:

    -Stainless steel, martensitic, AISI 440B, tempered at 316°C
    -Stainless steel, austenitic, BioDur 108, 30-40% cold worked
    -Stainless steel, austenitic, AISI 302, HT grade D
    -Stainless steel, austenitic, AISI 304, 1/2 hard
    -Aluminum, 7010, T7651
    -Aluminum, 7055, T7751
    -Aluminum, 7055, T77511
    -Titanium, commercial purity, Grade 4
    -Nickel-Fe-Cr alloy, NIMONIC 942, bar
    -Nickel-Fe-Cr alloy, D-979, bar

    In terms of manufacturing the materials into the shape below, which would be best?
    upload_2016-11-22_21-45-12.png

    2. Relevant equations n/a
    3. The attempt at a solution

    From my understanding, titanium is notoriously hard to manufacture so I would not choose this
     

    Attached Files:

  2. jcsd
  3. Nov 23, 2016 #2

    Nidum

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    Gold Member

    I would not have chosen any of those materials for a vehicle suspension spring .

    Have a look instead at some of specially formulated steels available for spring manufacture .
     
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