Identification of the gear wheel material

[adriankulik92]

Hello,

I am writing this post, beacuse I need some help. I've received a task from the teacher to identify the material of the gear wheel, but I got only to use caliper. After some time, I have idea, that I should calculate bending strength and then look for the bending strength values in the different tables with assigned materials. Is that way of thinking good? I've found a lot of different formulas for bending stress / bending strength and I am not sure which one is correct, maybe you have experience with this kind of calculations?

Important data:
- gear wheel is made of polymer
- assumptions: max rpm = 3500, P = 140 kW
- module of gear wheel: 2,5
- number of teeth: 26
- pitch diameter: 64
The gear wheel is produced according to the standards.

Regards

[Cake of Doom]

You're on the right track with the process of elimination approach.