Fracture of Metallic Ring Samples under static and dynamic loading Viktor A. Morozov ∗1 , Yuriy V. Petrov ∗∗ 1 , Anton A. Lukin1, Viktor M. Kats1, Svetlana A. Atroshenko1, Georgii D. Fedorovskii1, Dmitriy A. Gribanov1, Olga K. Zaichenko1 1Saint-Petersburg state university, 7-9, Universitetskaya nab., St. Petersburg, 199034, Russia ∗viktor.morozov@math.spbu.ru, ∗∗yp@yp1004.spb.edu Abstract A study on the destruction of thin aluminum and copper samples in a wide range of loading times was made. Static loading of samples in the form of strips on a tensile testing machine was carried out. For dynamic loading magnetic-pulse method with a period of 1 sμ loading and 7,5 sμapplied. The samples were made in the form of rings. The mechanism of fracture in each time range, and the peculiarities of the behavior of materials was studied. A mathematical model for fracture process was proposed. Comparison of the mechanical properties of materials under static and dynamic range tests was realized. Keywords: static loading, dynamic loading, fracture, magnetic pulse technique, metallic ring samples. 1. Introduction A large number of experiments on loading of continuum shows fundamental differences between destruction process under the influence of slow quasistatic loadings and "fast" dynamic destruction. In case of quasistatic deformation critical value of strength parameters is much less dependent on experimental conditions, than at dynamic influence. As observed critical characteristics of destruction at dynamic deformation it is essential volatile and behave it is rather unpredictable, one of the main objectives at definition of dynamic strength characteristics is research of interrelation of the limit power parameters conducting to destruction of a material with duration, amplitude and growth rate of enclosed loading. Results of microstructural research of the destroyed samples. The mathematical model, allowing to describe destruction of materials both at static, and under dynamic conditions of loading is considered. Results of a experimental study on a rupture of thin aluminum and copper samples in the form of narrow strips as in the conditions of static loading by breaking machine, and at dynamic harmonic stretching impact with the period 1μs are given in this work. In the second case the magnetic-pulse method of loading was applied, and samples were carried out in the form of rings. The destroying static tension of materials is determined and the assessment of their dynamic breaking points with use of the offered method of measurement of time from the beginning of loading until destruction is made. Comparison of breaking points in static and dynamic conditions is carried out. Results of microstructural research of the destroyed samples are given. The mathematical model, allowing to describe destruction of materials both at static, and under dynamic conditions of loading is considered.
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