TESTING MACHINE FOR DETERMINING FATIGUE CHARACTERISTICS OF POLYMER COMPOSITE MATERIALS UNDER CYCLIC BENDING LOADING Russian patent published in 2023 - IPC G01N3/00 

FIELD: polymer composite materials.

SUBSTANCE: invention relates to polymer composite materials. The specified effect is achieved by the fact that the testing machine contains a base on which a block of supports is installed, made with the possibility of changing the distance between them to accommodate the tested flat samples of polymer composite materials of various dimensions, symmetrically located relative to the block of supports and connected in the upper part by a metal bar two power guide columns with a horizontal traverse, a support with an electric motor that drives the testing machine, a frequency converter for starting the electric motor and adjusting the speed of its output shaft with a pulley coaxially mounted on it, equipped with a slider with an adjusting screw designed to change the distance between the pulley center and pivotally attached by the upper part to the slider by a connecting rod made in the form of a lanyard, providing the possibility of changing its length. The lower part of the connecting rod is pivotally attached to the brackets located on the upper surface of the horizontal traverse, and is designed to be able to convert the rotational movement of the pulley into vertical translational motion of the horizontal traverse along the guiding power columns. A punch with a loading tip is fixed to the lower surface of the traverse through an S-shaped compression force sensor to provide impact on the flat sample being tested. The S-shaped compressive force sensor is configured to record the values of the sample reactions to loads from the loading tip of the punch during each loading cycle.

EFFECT: determining the fatigue strength of polymer composite materials under conditions of cyclic bending loading.

1 cl, 1 dwg