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Apparatus and method for determining failure mode in a shear or pull test device

  • US 7,950,290 B2
  • Filed: 05/12/2010
  • Issued: 05/31/2011
  • Est. Priority Date: 03/08/2006
  • Status: Active Grant
First Claim
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1. A method of determining the mode of bond failure of an electrically conductive ball deposit on a substrate which is subjected to a breaking force by a tool to break at least a part of the ball deposit off the substrate, the method comprising the steps of:

  • producing electrical force signals which indicate the force on the tool while the tool is breaking at least a part of the ball deposit off the substrate,producing electrical tool displacement signals which indicate the displacement of the tool relative to the substrate while the tool is breaking at least a part of the ball deposit off the substrate;

    processing the electrical force signals to determine a selected peak breaking force,utilizing the electrical force signals and electrical tool displacement signals to determine a first value of energy occurring before said selected peak breaking force, andutilizing the electrical force signals and electrical tool displacement signals to determine a second value of energy occurring after said selected peak breaking force.

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