Good day, I am a mechanical engineering student, we conducted three-point bending test for a metal specimen and I am wondering why the temperature of the specimen did not increase as the UTM certainly did work on the specimen, therefore some thermal energy increase should be present.
This is in comparison when we conducted tensile test to another specimen in which we realized that the metal became appreciably hot.
I think it was because bending involved tension and compression, reasoning that because they are opposite of the other, while tension releases thermal energy because of the pulling away (rupture) of interatomic bonds, compression accepts thermal energy because it needs for the compression of the bonds? Therefore no (or minimal) thermal energy increase could be observed after bending.
I can't research anything related to this phenomena on the internet. (Also we had never conducted yet a compressive test, so I don't know if compressing the metal reduces its temperature). I also know the physics of thermal expansion (metal expands with increase in temperature), I am not just sure if it applies the other way around.
I just want to know if you think my hypothesis is correct, or if not could you provide a link or explanation? Thank You