Understanding True Stress and True Strain
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- čas přidán 6. 08. 2024
- 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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Question: We can not use engineering and true stress relation after necking but what about strain? Can we use this strain relation abeyond necking?
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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.
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.
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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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With Respect
Parijat (IIT Kharagpur, India)
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Thank you for clarifying that point.
That bugged me ever since because it was never clear which area the load was divided by. It just didn't make sense to me that the strenght of the material was getting worse when it's cross sectional area was smaller for a bigger load.
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Hi, your videos are very clear and helpful! Could you make a video explaining the differences between proportional limit, elastic limit and yield point in the stress strain diagrams?
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Perfect videos, perfect animation and I appreciate your work. almost seen your every video. just one correction in this video. Stress is Internal resisting force to the applied force per unit area. And not applied force per unit area. Thanks
So to sum up :
True stress and strain is mostly higher than engineering stress and strain ( which we calculate theoretically). But with the help of this equations 6:30 true stress and strain can be easily calculated
This is a missing part when I was learning the stress - strain test. True strain and stress are precisely depicting the tensile experiment.
That video quality though ❤️🔥
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Thanks!