Kriten sent me solidwork part files for the steel pmc. I'm checking all the parts and will decide what material we want to use.
She reported that a ss pmc will have the first body mode at 780 Hz, while an aluminum one will have the first body mode at 1kHz. But we have to take thermal expansion, stiffness into account. here are some material properties
| |
Stainless steel |
AL |
| Thermal expansion coeff x10^-6 |
16 |
22.2 |
| Young modulus [GPa] |
180 |
69 |
| density x10^3 kg/m^3 |
7.8 - 8 |
2.7
|
I think the thermal expansion will be a problem, but their thermal expansion coefficients are not that different. I don't know about stiffness of the body. I'll ask someone about this. Otherwise Al might be a better material if we look for higher resonant frequency. |