Hi, Michael:

I am not sure if I can give  you the correct answer. Let's just try

q = (mass  x  specific heat of the material ) * Temperature change
Where q heat flow is from energy conversion from electric to thermal, I kind
remembet that is
equal current square * resistance * time.

You know most parameter and mass ( density *  width* length* height) and
initial temprature.
You also can get specific heat constant for Cu at specific tempearature
range. You may calculate the final temperature or you just want to temp
change.

Again, don't quote me on this. It has been so long since I had those
classes.

Be careful for those unit and have fun for your science project.


-----Original Message-----
From: Hiteshew, Michael <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Tuesday, December 15, 1998 3:41 PM
Subject: [TN] Temperature Rise on a Trace


>Hi,
>        I have a little physics problem maybe someone can help me with. I'm
>looking
>for an equation to solve for the temperature rise in a trace with a given
>amperage over
>a given period of time. Here's the problem:
>        A copper (inner layer) trace will have 6 amps on it (under short
>circuit conditions)
>for a maximum of 128 microseconds. For a given trace width and length, I
can
>calculate
>the DC resistance. What I can't calculate is the temperature rise on that
>trace over that
>time. Obviously, I need to know this to ensure I don't approach the fusing
>temperature
>of the copper.
>        I'll turn this into a science project if I have to, but I'm
>wondering if anyone has
>this equation at their fingertips. Thanks in advance if you do.
>
> Michael Hiteshew
> Lockheed Martin Launching Systems
> [log in to unmask]
> (410) 682-1259
>
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