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Fastener member stiffness

  1. Aug 18, 2014 #1
    I am going through Shigley's Mechanical Design book and have a quick question on fasteners. Sometimes when calculating the spring rate for a member, you have to multiply the rate by 2, why is this? For instance in this problem
    http://imgur.com/2ug9AaR

    When the spring rate is calculated for both the cylinder head and cylinder, both spring rates are multiplied by 2 and then added together to get the total Km. (This is not a homework problem)

    Thanks.
     
    Last edited: Aug 18, 2014
  2. jcsd
  3. Aug 19, 2014 #2
    I'm not familiar with the precise context, but could it be because the objects can expand/contract radially in two directions (whereas if fixed at one end could only expand/contract axially in one)?
     
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