[CarVac]

Tg changes? Or do you mean they deflect sooner under more load?

[nomel]

Maybe "load" includes the heat that comes from the changes forces from the vibrations? But even then, that would be additional heat sources, rather than a change in the temperature where it happens.

Polycarbonate shows little change vs pressure [1]:

[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC6403934/