DEVICE FOR INSTRUMENTAL INDENTATION WITH THE POSSIBILITY OF EXPERIMENTAL OBSERVATION OF THE AREA OF CONTACT BETWEEN THE INDENTER AND THE SAMPLE SURFACE IN REAL TIME Russian patent published in 2023 - IPC G01N19/08 G01N23/04 

FIELD: determining elastic properties of materials.

SUBSTANCE: device operates by pressing a micro- or nanoindenter into the sample surface to a given depth or under the action of a given force. The device contains a point source of X-ray radiation, a rotating goniometric table with a sample fixing unit and a power loading unit for the test material, an X-ray detector, as well as a computer processing and control unit, a unit containing coaxially arranged segment of a cylindrical tube made of a material transparent to X-rays, a microindenter and a device for linear movement of the microindenter, for fixing the aforementioned assembly on the goniometric table. On the upper plane of the seat inside the cylindrical tube there is a block for fastening the test sample. The distance between the X-ray source and receiver is chosen to be 30 ± 5 mm, and the goniometric table with the aforementioned node is located in the middle between the source and receiver of x-rays. The section of the cylindrical tube is made of ULTEM or PEEK plastic. The power loading block is made electrical and consists of a precision electric actuator with a displacement step of less than 25 nm, containing a precision displacement sensor connected to the controller, the actuator is connected to a device for linear displacement of the indenter, in which there is a place for installing a piezoactuator with a displacement step of less than 1 nm, and is rigidly fixed on the upper end of the inserted cylindrical tube outside it, and the lower end of the tube is connected by a threaded connection to the sample attachment unit containing a precision force sensor connected to the microprocessor signal processing unit. The controller and the microprocessor unit are physically connected to the computer processing and control unit, and the signals processed by the controller and the microprocessor unit are software-combined, which makes it possible to construct a curve of the dependence of the force on the indenter penetration depth during the indenter penetration and unloading of the indenter before, after and during shooting 3D models of the deformation state of the material surface.

EFFECT: expansion of technological capabilities in the study of elastic deformations and mechanical properties of materials, the ability to control the movement of the indenter and the force acting on it at any time with high accuracy.

1 cl, 7 dwg