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Information × Registration Number 0223U001271, 0121U112251 , R & D reports Title Experimental-computational study of the high-strength materials behavior in static and dynamic punching of thin plates, taking into account the strain rate popup.stage_title Head Kravchuk Roman V., Registration Date 26-01-2023 Organization GS Pisarenko Institute of Strength Problems of the National Academy of Sciences of Ukraine popup.description2 The paper analyzes the current state of experimental and computational studies of the high-strength materials behavior under static and dynamic punching. The features of determining the parameters of Johnson-Cook deformation and destruction material model are considered. The equipment for static punching tests of thin-sheet samples has been improved by recording the punch displacement with a strain gauge instead of a displacement sensor of the test machine. This made it possible to significantly reduce the elastic component of the deformation of the experimental equipment loading circuit and, accordingly, increase the accuracy of the calculated results. On the basis of the experimental studies carried out, new data were obtained on the effect of the load rate on the behavior of high-strength steels Armox 500T, Hardox 450 and carbon steel 20 when punching thin-sheet samples with different types of punches: hemispherical, flat and conical. It has been found that as the load speed increases from 0.5 mm/min to 5 m/s, the resistance to deformation increases, in particular, for specimens made of Armox 500T steel, by about 20%, regardless of the type of punches. Based on the tensile tests of three types of specimens (without a concentrator and a concentrator with a radius of 2 mm and 4 mm), as well as the numerical results of punching tests on thin-sheet specimens made of Armox 500T steel the optimal values of the Johnson-Cook model material parameters were determined, at which the experimental and calculated load diagrams show satisfactory convergence. The obtained experimental and computational results can be used in numerical modeling of the deformation and fracture processes of specimens and structures made of high-strength steels.  Product Description popup.authors popup.nrat_date 2023-01-26 Close