Materials and Process Selection for Engineering Design, 3rd Edition

416 Materials and Process Selection for Engineering Design

For the CNT-based gauge to be competitive relative to current gauge materials,

the value of (∆γ α

T

/∆C α

c

) needs to be greater than 1. Table 11.18 gives the results

of applying Equation 11.25 under three different conditions:

1. Technical performance is equally weighted to cost, α

T

/α

c

= 1.

2. Technical performance is more important than cost, α

T

/α

c

= 3.

3. Technical performance is much more important than cost, α

T

/α

c

= 5.

The results show that the PMMA–1 wt% MWNT gauge offers a more feasible

alternative as its price is allowed to be six times that of the constantan alloy foil

gauge f ...