Difference in deflection??

[Klank]

Hi people.

Does anyone knows if the deflection for two steel plates of the same material with the same dimensions but at different hardenings will be the same or not?

FX. if a plate is 250mmx1000mmx50mm @ 62 HRC and is loaded in the middle of the plate with a force of 30 metric tonne, will the difference in the deflection then be smaller, than if the plate was hardened to 55 HRC?


Thanks in advance

[Geof]

The elastic deflection under the same conditions will not change. This depends on a property of the material called Young's Modulus abbreviate E in deflection calculations

What will change between non-hard and hardened material is the elastic limit. This will be higher in the case of hardened material. In other words you can apply a greater load to the hardened material, it will deflect further due to the increased load but it will spring back to the original shape. With the non-hard material the same load will deform the material permanently because the lower elastic limit has been exceeded.