when we do the tensile stress simulation, why we have to select the materials and power?

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In recent days, I saw many videos about comsol tensile simulation.

All the people applied specific power and materials to their structure.

So I followed it and I get the result below.

But, when I changed the material or tensile power, all the results showing the same result.

(It only shows the distribution of the stress.)

So, why people select the material and power?


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