Understanding True Stress and True Strain

Did you know that the typical stress-strain curve obtained from a uniaxial tensile test is just an approximation? It doesn't consider the fact that the dimensions of the test specimen change throughout the duration of the tensile test.

In this video I cover the interesting topic of true stress and true strain.

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The Efficient Engineer is a channel aimed at mechanical and civil engineers. The mission is to simplify engineering concepts, one video at a time!

[MegaOjetemoreno]

As a former engineering student and a current engineering professor, I can only applaud these videos. I wish I had this during my student times. I recommend these videos to my students but I think they do not grasp how lucky they are for having this learning material.

[ScarletKnightmare]

The quality and clarity of your videos are second to none. Thanks, from a non engineer.

[mansaranbaath]

As a mechanical engineering student in my third year I must applaud you for explaining these crucial concepts with such simplicity. The mark of an excellent teacher.

[eliejororirakiza]

Never understood one thing about this in college, understood all of it in a 6 min video

[neelgkumar]

Great video. One another possible reason why engineering stress is used in practice, in addition to difficulty in measuring true stress, is that it better reflects real-life loading scenarios in the sense that the applied load doesn't change when necking initiates.

[moaqirahmad]

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[nowyouknow-sortof]

Thank you!! I had only studied Engineering stress-strain curves and it had been bugging me as to how they ended up at such a curve from the results of a UTS test, whether the reduction in cross-sectional area was taken into account or not. You answered it on point! Thank you so much.

[sulskull]

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[daviddemiguel]

Hi! I’m a Materials Engineer and I know that these concepts are sometimes difficult to understand. So, I appreciate your video because you achieve to explain it clearly. Nice job mate!

[mathengzz]

Great video as usual! I would just like to add that in structural engineering we don't design structures to remain elastic (at least in reinforced concrete), but we still use engineering stress for design because most of the time we work with uniaxial stresses and strains (for example, we simplify reinforcement bars and we assume they are linear elements instead of 3D elements).

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