Comparing research results from power spectra and Kolmogorov entropy to three stages of forepart,rear part and whole process of strain-stress curves,the paper finds that Kolmogorov entropy method is satisfied even more.

Taken the fine-grain and high-strength IF steel as the study object,the strain-stress curves were carried out on MMS-300 thermal mechanical simulator with the deformation temperature at 750,800,850,900,950,1 000 ℃ respectively.

The strain-stress curve were carried out on Gleeble-3800 Thermal Mechanical Simulator with 10 s-1 strain rate,50% reduction and the deformation temperature at 700-1000℃.

The strain-stress curves were measured using Gleeble 3800 thermal mechanical simulator at strain rates of 0.

The strain-stress curve of high-strength IF steel were carried out on Gleeble-3800 thermal mechanical simulator with 10 s-1 strain rate,50% reduction and the deformation temperature at 700~1000℃.

The true strain-stress curve is obtained.

Experimental study on stress-strain curves of compressive solid concrete brick masonry;

Experimental study on the stress-strain curve of air-entrained concrete;

Complexity of shear band patterns and discreteness of stress-strain curves;

Realization of sheet metal stress-strain curve based on vision technology;

Then,stress-strain curve of each specimen with same scale is simulated on condition that the static water pressure is 5 MPa and that the axial pressure is operated step by step.

Both the circle stress scale on the curve and the S-N critical stress of　σ_(cr) Ⅰmodel crack propagation show certain actual stress on the stress-strain curve of material.