Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculating impact resistance of a silicone wafer

  1. Jan 25, 2016 #1

    pmd

    User Avatar

    Wondering the best way to go about calculating the ability of a silicone wafer to withstand impact. Wanting to possibly use a small pc as a fracture barrier to indicate that a part was dropped and may potentially be damaged. Need it to handle 20G. Alternative mat'l suggestions would be appreciated.
     
  2. jcsd
  3. Jan 26, 2016 #2

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    I don't entirely understand the question - is this a wafer as in chip manufacture or just a sliver that you want to use for damage detection in a piece of equipment ?

    Either way probably need to detect accelerations in three axes .

    For general equipment an accelerometer system and recorder will supply all the information needed . You can buy packaged devices quite cheaply .

    To design something yourself have a look at micromechanical systems and microaccelerometers . Etched in for chip wafers and some of the same ideas on larger scale for equipment . Set up to actually break for a one time detection or record the output for later analysis .

    Please describe your actual requirements in more detail .
     
  4. Jan 26, 2016 #3

    pmd

    User Avatar

    Nidum, thanks for your reply. I am not looking to record any data. I am trying find a thin, brittle material that can be used in a manner that should it be dropped, will break when the impact exceeds a predetermined level. Much like the impact sensors found on wooden crates for shipping. If the crate gets dropped accidently, the sensor 'breaks' indicating that a certain force has been exceeded. Because the parts I want to protect are much lighter, I was thinking of using silicone wafer material or something equally brittle.
     
  5. Jan 26, 2016 #4

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    Glass is what is commonly used . Microscope slide sort of thickness . Cantilever with a weight at one end is probably easiest configuration .

    Breaking load for cantilever can be estimated using standard calculations . Breaking load for real components will probably show some variation around the calculated figure .
     
  6. Jan 26, 2016 #5

    pmd

    User Avatar

    Thanks again. The thickness of a glass slide would be too thick that is why I was thinking silica wafer, it can be made very thin and varied to meet different loads. Because of other requirements, I will need to calculate a beam fixed at both ends rather than a simple cantilever perhaps find a thin rod of glass and start there. Appreciate the quick responses
     
  7. Jan 26, 2016 #6

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    Rod of glass is good - they come in many sizes .
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Calculating impact resistance of a silicone wafer
  1. Etching of SOI wafer (Replies: 8)

Loading...