METHOD FOR ASSESSING THE RIGIDITY OF A FIBER OR THREAD IN SLIDING BENDING Russian patent published in 2023 - IPC G01N33/36 

FIELD: stiffness assessment methods.

SUBSTANCE: invention relates to a method for assessing the stiffness of a fiber or thread in sliding bending. The effect is achieved by a method for assessing the rigidity of a fiber or thread in bending, including testing a fiber or thread sample by bending around a cylinder with a certain radius, moving along the cylinder, measuring the power parameter associated with the movement of the sample, in which the free driven section is stretched by a constant load suspended from it. mass, as well as the calculation of the stiffness rating. Wherein the test by moving the sample along the cylinder is carried out in two stages, the first uses a cylinder with a large diameter, and the second - with a smaller one. After moving the sample over the surface of the cylinder, at each stage, the force parameter is estimated in the form of the energy expended on the movement. Wherein the expended energy is estimated by the difference in the deflection angles of the physical pendulum, in which the end of the leading section of the test sample is attached in the zone between the suspension point and the center of gravity, and the stiffness is assessed by the totality of energies, one of which is spent on moving along a cylinder with a small diameter commensurate with conditional diameter of the sample section, and the other - to move along a cylinder with a large diameter, the value of which is greater than where EI - bending stiffness of the sample N⋅mm²; T₀ is the tension force of the driven section of the sample due to the suspension of a load of constant mass to it, N.

EFFECT: increasing the information content of the analysis results and simplifying the testing process.

1 cl, 1 dwg