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I'm working with 2004, so there may be some minor differences, but what I'm guessing you're seeing is the default plots. On each of those plots, you need to edit the definition (right click>edit definition or chart options in newer versions, I think) and set, for example, the stress range. If you're working with a material of 200 MPa yield strength, you might set a range of 0 to 200 MPa. Anything red will fail (theoretically).
The way I use it I look for the highest stress areas and strengthen those areas. As I have learned from others, if you don't know FEA real well, the best you should expect is trends, not exact numerical results.
Also, it took me awhile before I figured out restraints and loads well. Make sure you have accurate assumptions.
Hi Phil, this is a pretty generic question. If you still have questions on this, e-mail me a screen shot of your problem. I'd guess it is a restraint problem.