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Engineering Bulletin # 11, November 2014
УДК: 539.3; 539.4.019.1; 620.17
Issues of damping and absorbing properties of materials and structures
Engineering Education # 06, June 2012
DOI: 10.7463/0612.0442023
As a rule, damping and absorbing properties of materials and structures are determined, basing on the German-French version of terminology. Absorbing properties of porous materials and honeycomb structures can be quantified by energy density shock absorption and energy efficient impact absorption based on the diagram of deformation of porous materials and honeycomb structures. These estimates of single (one-time) shock absorbers are similar to the impact energy received by the absorber, and to efficient energy shock absorption used in the evaluation of multiple shock absorbers. However, in the automobile industry damper is called shock absorber (using the Latin version of the word "depreciation"), and in the field of explosive and impact loading of structures shock absorber is called damper. Taking into account this fact will allow to avoid confusion in the domestic scientific and technical literature.
Application of the Taylor test to research dynamic mechanical properties of highly porous aluminum alloy
Engineering Education # 09, September 2012
DOI: 10.7463/0912.0442058
Application of the Taylor test (cylinder) allowed to obtain experimental data on dynamic behavior of volume-perforated samples of the aluminum alloy D16T at an impact velocity against a hard wall of up to 150 m/s. To calculate the impact, software packages LS-DYNA and ANSYS AUTODIN in two versions were used. The first variant included direct modeling of the structure of volume-perforated samples by the finite element method, and the second variant included using constitutive equations of porous elastoplastic medium based on a homogeneous model. For the second calculation variant the authors applied both experimental data in the form of a deformation curve obtained for uniaxial stress state and calculation data based on numerical simulation of deformation and compression of volume-perforated samples. The authors received a good qualitative agreement between the calculated and experimental data in the Taylor test, as well as a satisfactory quantitative agreement between the calculated and experimental results.
Application of accelerometry for research of dynamic mechanical properties of materials in complicated environments of measuring
Engineering Education # 08, August 2012
DOI: 10.7463/0812.0428828
The authors carried out experimental studies aimed at development of variants of systems of continuous electric communication with the accelerometer under the conditions of application of terminal ballistics accelerometry (TBA-technology) to impact of a rigid body at an angle to the surface of the medium under test. A particular case of TBA-technology was tested under laboratory conditions for the case of inclined impact of soil medium along with defending screens. The algorithm of retrieving data on dynamic mechanical properties of soil medium using registrations of deceleration history of a rigid projectile during the penetration process into the medium under test was debugged. The developed technology is suitable for obtaining data on dynamic mechanical properties of soil medium in the range of sub-sound impact velocities.
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