Effect of Dynamic Strength of a Material on Its Erosion Resistance
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Effect of Dynamic Strength of a Material on Its Erosion Resistance A. D. Evstifeeva, b, *, I. V. Smirnovb, and Yu. V. Petrova, b, c a Research
Institute of Mechanics, Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603600 Russia b St. Petersburg State University, St. Petersburg, 199034 Russia c Institute for Problems of Mechanical Engineering, Russian Academy of Sciences, St. Petersburg, 199178 Russia *e-mail: [email protected] Received April 15, 2020; revised April 15, 2020; accepted April 23, 2020
Abstract—An increase in the static strength of materials operating in extreme service conditions does not enable one to judge the reliability of resulting products. This report describes the features of material deformation observed as the deformation rate increases in the cases of aluminum and titanium alloys. The possibility of choosing a material for given service conditions is discussed in terms of the structural–temporal approach. Keywords: impact effect, criterion of incubation time, erosion abrasion, severe plastic deformation, aluminum, titanium DOI: 10.1134/S1063783420100066
1. INTRODUCTION The modern aero-space branch faces the introduction of revolutionary methods and approaches to projection of aircrafts. To lighten constructions, composites are more and more often used in combination with alloys of light nonferrous metals instead of steel constructions. In this case, a part of important units of construction is mainly fabricated of titanium alloys, in spite of their higher weight as compared with aluminum materials. Such an approach enables one to increase the strength and the reliability of a construction at the conditions of operating in the range of quasi-static loads. However the operation of a material under dynamic loads does not receive proper attention despite the substantial features of the material deformation that appear as the deformation rate increases [1–6]. The extrapolation of the material properties to the region of high strain rate gives, as a rule, error results, and this approach does not stands up during designing important dynamically-loaded elements. In this work, we consider the results of experiments performed on an aerodynamic-type installation [7] and on a tower impact testing machine with an accelerator [8]. We demonstrate the regions of applying AMg6 aluminum alloy and VT1_0 titanium alloy under extreme loading conditions and also consider the way of increasing the strength of the aluminum alloy that do not decrease the dynamic strength of the material. The analytical approach proposed experi-
mentally and based on the structural–temporal approach allows one not only to choose materials for extreme service conditions but also to form principles for the possibility of increasing the material strength. 2. EXPERIMENTAL We studied VT1 titanium alloy and AMg6 aluminum alloy in the initial and ultrafine-grained states [9]. The strength properties of the aluminum alloy were increased by the equally-channel angular pressing (ECAP) along the Bc route at 200°C
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