A MEPR Calculator program is described that provides automatic computations of the longitudinal elastic modulus and Poisson’s ratio of structural materials in accordance with operating test standards. The deformation diagram of the material with a clear-cut linear section is examined. The program permits of valuating the agreement between calculated and experimental data with the coefficients of determination r2 and variation V in elastic modulus and Poisson’s ratio computations. The program features the on-line display and visualization of the calculated parameters in establishing the limits of the linear section of the deformation diagram, which makes longitudinal elastic modulus and Poisson’s ratio computations much easier and faster on condition of the best data agreement.

Results of experimental investigation of mechanical characteristics of ULTEM 9085 thermoplastic, produced by additive manufacturing, i.e., the method of layer-by-layer application of a molten polymer thread, are presented. Flat specimens were tensile tested within the temperature range of (–40) –150°C. Temperature dependencies of ultimate strength, relative elongation at break, elastic modulus, and Poisson’s ratio are obtained. At a temperature of –40°C, the linear sections of diagrams obtained for various specimens coincide; in the area of elastoplastic deformations, their discrepancy is noted. This caused small variations in elastic characteristics and significant ones in strength and relative elongation at break. Similar features of deformation diagrams were also obtained at a temperature of 50°C. However, at 150°C, tensile diagrams do not coincide even in the area of small elastic deformations; their specific bends are noted. Specimens are fractured by the normal separation mechanism at all temperatures. When the temperature changes from –40 to 150°C, thermoplastic ultimate strength almost linearly decreases; at 150°C it is 26% of the initial value at –40 °C. As temperature increases within the specified range, the relative elongation at break monotonously decreases more than twice (2.9–1.3%). The elastic modulus changes insignificantly within a temperature range of (–40)–20°C; when the temperature rises to 150°C, it decreases to 64% of the value at –40 °C. Poisson’s ratio virtually does not change and is in the range of 0.36–0.37.

В настоящее время широко используются в технике композиционные материалы (в авиации, ракетостроении и др.) из-за высокой прочности, малого удельного веса, применения их в конструкциях при высоких температурах, где металл не работает. Особое место занимают углерод-угле- родные композиционные материалы (УУКМ) прочность которых при высоких температурах увеличивается по сравнению с прочностью при комнатной. Целью данной публикации является исследование прочности УУКМ при температурах 300…3300 К при растяжении и сжатии. В настоящее время в литературе имеются данные об этих свойствах только до 2200 К, а УУКМ используются в ракетных двигателях при Т = 3300 К. Для проведения этих исследований разработаны новая методика, созданы экспериментальные средства и получены результаты по прочности УУКМ при растяжении, сжатии в дтпазоне температур 300…3300 К. [dx.doi.org/10.29010/084.5]

Within a dynamical approach, the average spins of fission fragments originating from the 12C + 235,236U and 13C + 235U complete fusion reactions at c.m. energies in the range of Ec.m. = (55–75) MeV are analyzed as a function of energy. Particular attention is given to the process of formation of initial distributions for the components of the total angular momentum of compound nuclei. It is shown that substantial distinctions in the behavior of average spins of fission fragments for different fusion reaction channels are expected to be observed in the range of subbarrier energies.

The pharmacokinetics of the Astatine-211 radiopharmaceutical was investigated after a single injection in male SD (Sprague–Dawley) rats that had normal and iodine-free diets. Twelve groups of SD male rats were examined in the study. The tested drug was intravenously injected into the tail vein of the animals once at a volume of 10 mL/kg and dose of 100 μCi per animal. In the study, the animals were subjected to necropsy at specific time points with retrieval of the organs and tissues for further analysis of the activity of the samples using a well-type scintillation gamma spectrometer. It was found that the 211At absorption by the thyroid in the male rats that had an iodine-free diet was greater than in the rats that had a conventional diet.

A new approach to calculating the mean spins of induced-fission fragments is proposed. This approach, which has the key dynamic aspects of induced fission factored in, was used to analyze experimental data on the angular and energy dependences of mean spins and on the anisotropy of the angular distributions of fission fragments for the 16 O + 232 Th reaction at E cm = 80–150 MeV. The range of relaxation times that provide a consistent description of the experimental data was determined for the degree of freedom associated with the orientation of the symmetry axis of a fissioning nucleus with respect to the total angular momentum.

A way of calculating the average spins of induced fission fragments is developed, based on the dynamic model of their angular distributions. The range of relaxation times for the degree of freedom associated with the orientation of the axis of symmetry of a fissioning nucleus relative to its total angular momentum is determined by analyzing experimental data on the energy dependences of average spins and the anisotropy of the angular distributions of fission fragments for the 12C, 16O + 232Th reactions at E сm = 55–150 MeV.

A universal GDS-16 data acquisition and control system based on Quantum X MX840 measuring amplifiers and Catman Easy software is described. The system provides multichannel measurements of strains, displacements, pressures, and temperatures, data processing, visualization, and accumulation, which permits strength and thermomechanical tests of materials and structure elements to be performed.

A PMX-TEST multifunctional data acquisition and control system rigging the beds and units for strength tests of models and structure elements from composite materials is described. The system provides the multichannel measurement of strains, pressures, and temperatures. The corresponding PMX-TEST-Monitor software ensures digital and graphical representation of experimental data, their accumulation and storage for further processing.

A CFRP Strength software is described that provides computations of strength and elastic characteristics of polymer composite materials under basic loading modes, viz in tension, compression, and bending in accordance with operating test standards for the materials of this class. The software also permits of statistical evaluation of strength properties with a two-parameter Weibull distribution.

The possibility of a self consistent description of a large set of the experimental data concerning the induced fission reactions of heavy nuclei is demonstrated in terms of a theoretical approach to describing the decay of excited heavy nuclei that considers nuclear dissipation and the double-humped structure of the fission barrier. The experimental data on the probability of fission for a large set of nuclei, yields of shape isomers, total fission lifetime, and angular distributions of fission fragments for reactions induced by deuterons and α-particles are analyzed. Theoretical analysis yields new information on the parameters of double-humped fission barriers, magnitude of nuclear viscosity, and relaxation time for K -mode.

The paper describes an automated measuring system of a plant, which is designed for the investigation of the mechanical properties of structural materials in a temperature range of 4.2–300 K under the action of current pulses.

This work is a continuation of the development of Astatine-211, a new α-emitter radiopharmaceutical for treating cancer of the thyroid gland. The internal doses in a patient’s organs, e.g., the eye and the lens of the eye, are estimated using the GEANT-4 software for calculating absorbed doses in different organs with allowance for the complex anatomy of the human body. The results of calculations show that with the same therapeutic dose in an irradiated organ (the thyroid gland), the use of Astatine-211 radiopharmaceutical reduces the radiation dose of the eye by several orders of magnitude, compared to the use of pharmaceuticals containing 131I.

This paper presents the results of investigations on the microcracking of composite ceramic materials, such as electrical engineering porcelain and silicon nitride ceramics, using the acoustic emission technique. The analytical expression describing the kinetics of microcrack accumulation is refined. The influence of the loading rate on the strength characteristics of ceramics and the special features of acoustic emission during their cracking are studied. The dependence of the total acoustic emission count on the stressed surface area of specimens is found. The notion of the microcracking modulus of ceramic composite materials is introduced and its mismatching with the Weibull modulus in strength tests of ceramics is shown.

D. Fabris1, T. Marchi2, F. Gramegna2, M. Degerlier3, V. L. Kravchuk4, M. Cinausero2, S. Appannababu2, G. Baiocco5, L. Morelli5, G. Casini6, S. Barlini6, M. Bini6, S. Carboni6, N. Gelli6, A. Olmi6, G. Pasquali6, S. Piantelli6, G. Poggi6, S. Valdrè6, O. V. Fotina7, S. A. Goncharov7, D. O. Eremenko7, O. A. Yuminov7, Yu. L. Parfenova7, S. Yu. Platonov7, V. A. Drozdov7, A. Brondi8, R. Moro8, E. Vardaci8

A high-performance automated universal machine TTM-200 has been developed for conducting torsion tests. The software has been created that includes the TorsionTest program for torsion testing and TorsionCalc program for calculating the mechanical characteristics for this type of tests, which greatly simplifies the automation of testing processes and relevant calculations.

A method has been developed for producing a sharp crack and evaluating the fracture toughness characteristics of ceramic materials from the acoustic emission parameters. The method involves the use of a computer-aided measuring and control system and the appropriate FAE 1.0 software. With this method, it is possible to determine the important characteristics of the fracture toughness of ceramics, such as the R-curve for a fixed crack growth rate and V − K 1-diagram in a wide range of subcritical crack growth rates.