How to decide which component is best in terms of stress and deformation?

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Summary: In terms of stress, strain & deformation, what is better for a given component. 1) low stress or high stress 2) less strain or large strain 3) less deformation or large deformation?
Some dimensional changes were made in an existing component to study how these changes effect the component. Then CAD models of existing and modified component were made and analysed in ANSYS. Stress, strain & deformation values for both the models were found from analysis. How should I decide which model is better?

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PhanthomJay
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Summary: In terms of stress, strain & deformation, what is better for a given component. 1) low stress or high stress 2) less strain or large strain 3) less deformation or large deformation?
Some dimensional changes were made in an existing component to study how these changes effect the component. Then CAD models of existing and modified component were made and analysed in ANSYS. Stress, strain & deformation values for both the models were found from analysis. How should I decide which model is better?
well which case do you think would be better. And why do you say that?
 
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JBA
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You have not given enough information regarding the overall component's design, material properties, observed stress values, its application and the reason for the design change for any answer to be given to your question.

Sometimes, if there is no safety or operational risk created, there are tradeoffs between design stresses vs other benefits resulting from a design revision; but, this decision should only be made by an experienced engineer based on a detailed understanding of the subject at hand. An accurate application of FEA results requires both engineering knowledge and background knowledge of how to evaluate and verify FEA analysis results.
 
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What defines "best"?
 
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Firstly, I'd say you would have to specify the requirements that the component needs to meet, once this is established you could use young's modules to eliminate materials that do not met requirements.

As with Cad models depending on software, I use solidworks, you can test the materials and compare to see if they meet requirements.

But for any of them to work and for you to make the decision firstly you need to set the components requirement, and there's a few to consider, working temperature, loads, movement, creep, density, weight restriction, cost just to name a few.
 
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