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March 2007

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From:
al shirazi <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, al shirazi <[log in to unmask]>
Date:
Fri, 16 Mar 2007 15:03:20 -0700
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Thanks alot,
  But is there any chance to get the hysteresis loop experimentally,just by measuring the average stress and strain of the solder under the Thermal Cycling?
   
  Thanks,
  Al

Werner Engelmaier <[log in to unmask]> wrote:   Hi Al,
There are a number of ways—from closed-form equations to constitutive laws to 
FEA—by which the cyclic visco-plastic strain energy can be estimated for 
input into the solder creep-fatigue equation.
You really need to do a search for these--start at IPC-SM-785 and IPC-D-279.



Werner



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