I have been researching about the factors that affect natural frequencies, particularly about the effects of stresses.
Most of what I have found only discusses compressive and tensile stresses though, that they decrease and increase the natural frequency respectively
However, I cannot find anything about how bending/flexural stress affects the natural frequency. If I had to assume though, it probably does not affect it, as bending is just a combination of compression and tension occurring at the two sides, and they just cancel out.
Is my guess correct? And if not, can you link additional readings about it. Thank you!