Hi everyone,

I know this may seem a really easy problem but I'm struggling with it and wondered if anyone could tell me where I'm going wrong.

We are given a set of formula.

Stress Ratio R=min/max

Stress Range = бmax -бmin

Stress Amplitude = (бmax - бmin)/2

Mean Stress = (бmax + бmin)/2

Please note that the thing that looks like a 6 is in fact the greek letter for stress.

Then given a table with some of the data missing and some of it filled in.

What I need to know is if I'm given the following information:

R = 0.7 and mean = 85 How do I find the max, min and amplitude?

and given

amplitude = 30 and mean = -50 how do I find max, min and R

Any help would be much appreciated as I'm pulling my hair out over this.

Thanks in advance

Andy