What is the difference between engineering and true stress-strain diagram?

The curve based on the original cross-section and gauge length is called the engineering stress-strain curve, while the curve based on the instantaneous cross-section area and length is called the true stress-strain curve. This shows the cross-section of the specimen has changed during the experiment process.

What is true stress-strain diagram?

If the true stress, based on the actual cross-sectional area of the specimen, is used, it is found that the stress-strain curve increases continuously up to fracture. If the strain measurement is also based on instantaneous measurements, the curve, which is obtained, is known as a true-stress-true-strain curve.

Why engineering stress-strain and true stress-strain curves are same up to yield point?

The theory says upto Elastic limit, true stress-strain and engineering stress-strain curve are APPROXIMATELY same. In the formula: since in the expansion of log we are neglecting the higher order terms of engg strain, in case of lower strain that typically yields the same value of slope(Young modulus.)

How is true stress related to engineering stress?

True stress = (engineering stress) * exp(true strain) = (engineering stress) * (1 + engineering strain) where exp(true strain) is 2.71 raised to the power of (true strain). Be aware that experimental data always includes some degree of error and thus tends to be somewhat noisy or erratic.

Is engineering stress or true stress higher?

True stress is instantaneous and hence take the reduction in cross-section due to straining into consideration. It makes the true stress to be higher than engineering one.

Why is true stress higher than engineering stress?

Why the difference between engineering strain and true strain becomes larger as strain increases?

The difference between the engineering and true strains becomes larger because of the way the strains are defined, respectively, as can be seen by inspecting Eqs. 2.4 Using the same scale for stress, we note that the tensile true-stress-true-strain curve i<; higher than the engineering stress-strain curve.

What is the difference between engineering stress and true stress which one should be used in different situations?

Hi, engineering stress is the applied load divided by the original cross-sectional area of a material. Also known as nominal stress. True stress is the applied load divided by the actual cross-sectional area ( the changing area with respect to time) of the specimen at that load.