SHEAR TEST SPECIMEN (VERSIONS), AND ITS TESTING METHOD Russian patent published in 2013 - IPC G01N3/24 

FIELD: machine building.

SUBSTANCE: specimen is made in the form of a parallelepiped. Along opposite end faces of the parallelepiped, there made is a through rectangular slot on one side, and a projection of the same shape on the other side. Width of the projection is larger than width of the slot. Size equal to difference of length of the specimen and the sum of the projection height and the slot depth is at least by 10 times less than the specimen length. The specimen is equipped with a supporting element made either in the form of a frame enclosing the specimen, or in the form of a parallelepiped. Essence of the invention: at deformation speed of 10²÷10⁵ s^-1, the hammer acts on opposite end faces of the specimen through inlet and outlet transmitting bars on the side of the slot and the projection. Investigation of distribution of plastic deformation of the specimen is performed in the section of the flat side surface of the specimen in real time mode. Size of deformation section, which is equal to difference of width of the projection and the slot, is determined as per the formula. Infrared scanning of the deformed section of the specimen is performed; localisation degree of plastic deformation is determined as per the obtained temperature field and the ability of material to resist dynamic loads in the field of plastic deformation is estimated.

EFFECT: improving the accuracy of determination of the material characteristics in real time mode.

5 cl, 5 dwg