$4.$ Calculate Contact Resistance

Open calc$\_$contact$\_$res.m and provide the necessary expressions $($see slides, text

book or lecture notes$)$ for the contact resistance.

$\%======================$ YOUR CODE HERE $======================$

$\%$ Set known sample dimensions $($check the procedures document$)$

$\%$ Be sure to $***$respect the units indicated!$***$

d $=???$; $\%[$mm$]$

A $=???$; $\%[$m$^2]$

$\%======================$ YOUR CODE HERE $======================$

$\%$ Instructions: Provide expressions for R$1$ & R$2$ at each interface

$\%$ P $=$ Input Power $[$W$],$ dT$1,$ dT$2=$ temperatures drops, A $=$ area

R$1=???$; $\%[$m$^2$ C$/$W$]$

R$2=???$; $\%[$m$^2$ C$/$W$]$

Your values, if correct, should be on the order of $105($m$2$C$/$W$).$ Next, revisit your

Fig. $3$ produced above, and check Fig. $6.$ Are the discontinuities between the slopes

of the different materials realistic? Consider what factors play a role in creating these

$$jumps$$ and what could be used to minimize them.

$9$

Linear Conduction

Part $($c$)$: Contact Resistance

Notice that the temperatures are recorded at the extrapolated

intersection points, as shown:

$$Q:Whyis this? Whydon$$t we just use the actual data points?

Figure $6$: Contact Resistances

$1/21/17$

$()$

$11$

Deliverable $4.$ Contact Resistance Paste your MATLAB Command Window output for this

section into your submission document. Provide $1-2$ sentences discussing the factors that

may play a role in