scholarly journals ENERGETIC REGULARITIES OF PULSE LOADING BY SYSTEMS WITH INTERMEDIATE LINK

2017 ◽  
Vol 2017 (1) ◽  
pp. 83-90
Author(s):  
Александр Яшин ◽  
Aleksandr Yashin ◽  
Сергей Баринов ◽  
Sergey Barinov ◽  
Алексей Киричек ◽  
...  
Keyword(s):  
Total Energy ◽  
Pulse Energy ◽  
Test Bench ◽  
Symmetry Axis ◽  
Deformation Source ◽  
Pulse Loading ◽  
Shock Pulse ◽  
Shock System ◽  
Experimental Researches ◽  
Energy Portion

The investigations carried out deal with the re-gularity study in the distribution of shock pulse energy at multiple procedures of loading. The experimental researches were carried out on the specially developed test bench in which under all waveguides (or tools) of the shock system there were situated independently (separately) sensors connected with an oscilloscope registering parameters of a shock pulse (a form, amplitude, duration). As a result it was determined that the increase of the eccentricity in the symmetry axis location of a head and a waveguide (or a tool) and their number in the shock system contributes to the reduction of an energy portion sent to the deformation source. The application of multi-contact schemes of loading allows sending large total energy of a shock pulse to the deformation source to accept conditions of experiment fulfillment. At that the energy portion of a shock pulse fall-ing to each waveguide (or a tool) in the multicontact scheme as compared with the singlecontact one decreases (for rod-formed waveguides by 20%, and for spherical tools – by 15%) at the installation of each subsequent waveguide (or a tool) in the shock system.

scholarly journals IMPACT OF ENVIRONMENT PROCESSED UPON EFFECTIVENESS OF SHOCK PULSE ENERGY TRANSFER AT WAVE DEFORMATION STRENGTHENING

2019 ◽  
Vol 2019 (11) ◽  
pp. 13-18 ◽  
Author(s):  
Андрей Киричек ◽  
Andrey Kirichek ◽  
Сергей Баринов ◽  
Sergey Barinov ◽  
Александр Яшин ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Pulse Energy ◽  
Element Model ◽  
Deformation Source ◽  
Shock Pulse ◽  
Impact System ◽  
Wave Deformation ◽  
Value Range ◽  
The Impact ◽  
A Share

The investigations carried out are dedicated to the analysis of the material impact of the loading environment upon the effectiveness of a shock pulse at wave deformation strengthening. To carry out investigations in the specialized program there is developed a finite-element model of an impact system consisting of a head and a waveguide pressed statically to the environment of loading. The impact system effectiveness was estimated on the ratio of shock pulse energy imparted to a deformation source taking into account the material of the loading environment to the energy of a head blow to a waveguide. It is defined that the most significant impact upon a share of transient energy of the shock pulse is rendered by the head parameters the change of which in the range considered allows increasing the effectiveness of the impact system by 15.6 times. The next important factor affecting considerably the effectiveness of shock pulse energy transfer is a ratio of the lengths of a head and a waveguide the change of which in the value range investigated allows increasing a share of energy transferred by 2.8 times. The least impact upon the effectiveness of impact energy transfer in the center of deformation with the impact system is performed by the material of loading environment – 1…3% for the rational values of the parameter ratios of the impact system elements (n more than 80%). At the forced choice of less efficient impact systems (L1/d1=1 ; L1/L2=1…10; n less than 62%) the impact of the material of loading environment may make 6…10%.

scholarly journals Investigation of the influence of the geometrical dimensions of the striker on the efficiency of energy transfer of shock pulses during wave strain hardening

2019 ◽  
Vol 297 ◽  
pp. 05012 ◽  
Author(s):  
Andrey Kirichek ◽  
Sergey Barinov ◽  
Aleksandr Yashin
Keyword(s):  
Energy Transfer ◽  
Strain Hardening ◽  
Pulse Energy ◽  
Deformation Zone ◽  
Geometric Parameters ◽  
Shock Pulse ◽  
Shock System ◽  
Deformation Area ◽  
Geometrical Dimensions ◽  
Shock Pulses

The article presents data on the influence of the geometric parameters of a flat-faced rod shock system on the efficiency of a shock pulse energy transfer to the deformation zone during wave strain hardening. As a result of the simulation, it was found that an increase in the ratio of the striker length to its diameter from 0.1 to 10 allows transferring 15.6 times more shock pulse energy to the deformation area. Changing the ratio of the lengths of the striker and the waveguide from 0.1 to 10 increases the share of the transmitted shock pulse energy by 2.8 times.

scholarly journals TEST BENCH FOR INVESTIGATION OF WAVE DEFORMATION STRENGTHENING PROCESSES

2019 ◽  
Vol 2019 (12) ◽  
pp. 50-57
Author(s):  
Andrey Kirichek ◽  
Sergey Barinov ◽  
Sergey Silantiev ◽  
Aleksandr Yashin ◽  
Aleksandr Konstantinov
Keyword(s):  
Surface Layer ◽  
Test Bench ◽  
Experimental Investigations ◽  
Micro Hardness ◽  
Advantages And Disadvantages ◽  
Deformation Parameters ◽  
Wave Deformation ◽  
Wide Range ◽  
Shock System ◽  
Mutual Disposition

In the paper there are described designs of test benches to investigate the regularities of wave deformation strengthening processes. The advantages and disadvantages of well-known designs are revealed. A design of a new advanced test bench having wider technological potentialities and saved from the drawbacks revealed of the equipment created earlier is offered. A new design of the bench allows investigating the influence upon a process of a wave deformation strengthening of the elements of a shock system the parameters of which are varied in a wide range and applying also a series of marks upon a tested surface of a sample with the assurance of a specified accuracy of their mutual disposition. The test bench developed is essential for the fulfillment of experimental investigations of the interconnection between wave deformation parameters, a shape, dimensions of samples to be strengthened and a card of micro-hardness of a strengthened surface layer.

scholarly journals Experimental Researches of the Cone-Belt Dispenser

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Zoltán HAGYMÁSSY ◽  
Erzsébet ANCZA ◽  
Ágnes GINDERT KELE
Keyword(s):  
Test Bench ◽  
Vertical Position ◽  
Different Types ◽  
Significant Change ◽  
Degree Deviation ◽  
Experimental Researches ◽  
Experimental Plots

Distributing different types of fertilizer more accurately and evenly necessary in experimental plots. In probe parcels the more and more precise labour quality demands require mechanization of experiments. A solution is offered to mechanization of distributing fertilizer on probe parcels. A new plot fertilizer distributor was designed and built. I outline here the principle of working of the plot fertilizer. The unevenness of spreading of each type is significantly influenced by the tilt of the cone-belt dispenser from vertical position. A test-bench was collected to measure the aberrations. The measurement proves that only a few degree deviation results in significant change in the unevenness of dispensing.

scholarly journals RESEARCH ON THE HYSTERESIS EFFECT ON POSITIONING THE SYSTEM WITH FLEXIBLE ELEMENTS / POZICIONAVIMO SISTEMOS SU LANKSČIAISIAIS ELEMENTAIS HISTEREZĖS EFEKTO TYRIMAS

2015 ◽  
Vol 6 (6) ◽  
pp. 607-611 ◽  
Author(s):  
Audrius Čereška ◽  
Giedrius Augustinavičius
Keyword(s):  
Software Package ◽  
Test Bench ◽  
Piezoelectric Actuators ◽  
Displacement Sensor ◽  
Hysteresis Phenomenon ◽  
Matlab Simulink ◽  
Positioning Systems ◽  
Conducting Research ◽  
Experimental Researches ◽  
Gathering Data

The paper analyzes the hysteresis phenomenon of positioning systems with flexible elements for transmitting motion of which piezoelectric actuators are used. The article investigates the influence of hysteresis on the accuracy of positioning systems. A special test bench for conducting research and stand-up methodology for carrying out experimental researches have been used. The test bench includes a computer piezo controller, an inductive displacement sensor and a dynamic data collector used for gathering data and transmitting it to the software package. Mathematical modelling of hysteresis using Matlab/Simulink software package has been done. The performed research has shown that the hysteresis model of maximum dispersion error compared to experimental results makes less than 5%. Thus, it can be stated that the selected method for hysteresis modelling is suitable for precision positioning systems having deformable elements and controlled employing piezoelectric actuators to model hysteresis. Straipsnyje nagrinėjamas pozicionavimo sistemos su lanksčiaisiais elementais, kurių judesiui perduoti naudojami pjezoelektriniai vykdikliai, histerezės reiškinys. Tiriama histerezės įtaka pozicionavimo sistemų tikslumui. Tyrimams atlikti naudotas specialus tyrimų stendas ir sudaryta eksperimentinių tyrimų metodika. Tyrimų stendą sudaro: kompiuteris pjezovaldiklis, indukcinis poslinkio jutiklis, duomenims rinkti ir perduoti į programinį paketą naudojamas dinaminis duomenų rinktuvas. Atliktas histerezės matematinis modeliavimas taikant Matlab/Simulink programinį paketą. Tyrimais nustatyta, kad histerezės modelio maksimali sklaidos paklaida, palyginti su eksperimentiniais rezultatais, yra mažesnė nei 5 %, todėl galima teigti, kad pasirinktas histerezės modeliavimo būdas yra tinkamas precizinių pozicionavimo sistemų, turinčių lanksčiuosius elementus, valdomus pjezoelektriniais vykdikliais, histerezei modeliuoti.

Cluster Model Study to the As2-Adsorption on GaAs(001)-Surfaces

1996 ◽  
Vol 441 ◽  
Author(s):  
T. Marek ◽  
H. P. Strunk ◽  
S. Kunsági-Máté ◽  
N. Mareka
Keyword(s):  
Total Energy ◽  
Ab Initio ◽  
Cluster Model ◽  
Symmetry Axis ◽  
Reaction Path ◽  
Ab Initio Methods ◽  
Gaas Crystal ◽  
Reasonable Time ◽  
Model Study ◽  
Atomic Surface

AbstractWe study by using ab-initio methods the adsorption of As2-molecules on a Gaterminated GaAs(001) surface. We represent the GaAs crystal by a Ga5As2H8 cluster, which is large enough to resemble the crystal but sufficiently small to be tractable in a computer in a reasonable time. We calculate the reaction path along the symmetry axis C2 of this cluster and obtain the reaction path by minimizing the total energy of the system (cluster plus molecule). In the calculated positions above the cluster we account for the possibility of the As2-molecule to rotate around the C2 symmetry axis and for a change in the distance between the As-atoms. As a main result we obtain that for heights above the (001) surface less than about 3.5A we find a clear influence of the discrete atomic surface structure on the reaction path of the As2-molecule.

scholarly journals Visualizing the Process of Forming a Shock Pulse in the Deformation Zone

2019 ◽  
Author(s):  
Андрей Киричек ◽  
Andrey Kirichek ◽  
Сергей Баринов ◽  
Sergey Barinov ◽  
Мария Рыжкова ◽  
...  
Keyword(s):  
Strain Hardening ◽  
Analytical Description ◽  
Surface Plastic Deformation ◽  
Process Conditions ◽  
Surface Plastic ◽  
Shock Pulse ◽  
Distribution Diagram ◽  
Microhardness Distribution ◽  
Dynamic Methods ◽  
Shock System

The article raises the problem of visualizing fleeting processes occurring as a result of wave strain hardening (WSH). The features of this method are unique capabilities for controlling the parameters of the shock pulse. This allows, in contrast to other dynamic methods of the surface plastic deformation, forming the desired microhardness distribution diagram in the surface layer at a depth of 6- 8 mm, while ensuring the required uniformity of hardening. The need to visualize this method is explained by the complexity of the analytical description of the ongoing wave processes in the shock system and the loading medium. Developing a visualization technique based on a model of the process of wave strain hardening consists of several stages. The stages include setting the initial and boundary conditions of the simulated elements, their physical-mechanical properties, loading conditions, the type of the mesh, the process conditions. The created model allows you to visually track the shock pulse movement after the striker hits the statically pressed waveguide against the loading medium, and at the same time to see the generation of the reflected deformation wave (the tail of the shock pulse) and its effect on the shock system elements and the loading medium. The results will make it possible to develop shock systems with the highest efficiency.

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