EQUIPMENT AND METHODOLOGY FOR STUDYING THE BEHAVIOR OF HIGH-STRENGTH STEELS UNDER STATIC PRESSING OF PLATE SPECIMENS

Reliable operation of products made of high-strength alloy steels is ensured by the availability of effective methods and equipment for studying their mechanical properties during manufacturing and operation. One of the most important properties of such products is resistance to impact damage. The implementation of such tests is limited by the high financial costs of manufacturing specimens and impactors (ammunition), the complexity of conducting them, recording the results, and the lack of initial data. Recently, alternative methods have been developed, such as static and dynamic pressing of plate specimens. In this case, the shape of the impactors (punches) is similar to the shape of the impactors used in punching due to similar material behavior. The pressing tests make it possible to confirm the parameters of the models of material deformation and fracture, which are necessary for numerical calculations of complex structures under various types of loads. The equipment and methodology for studying the behavior of high-strength materials under static pressing are presented. It is established that recording the punch movement using a strain gauge can significantly reduce the elastic deformation component of the power chain of the test machine and fixture loading. A series of tests were performed on specimens cut from Armox 500T steel sheets with thicknesses of 3, 5, and 10 mm for static pressing by different punches (conical, flat, and hemispherical). It was shown that the plastic properties of the material decrease with increasing thickness of rolled steel, regardless of the type of punch. The obtained results confirmed the operability of the presented equipment and methodology and can be used in numerical modeling of deformation and fracture processes of high-strength steels.