Articles

 


№1 | №2 | №3 | №4 | №5 | №6


1.
category: Structural metallic materials
УДК 629.1.032.1
Operational destructions of elements of running systems of caterpillar transport systems
Factors defining conditions of destruction of elements of running gear of tracked vehicles of easy category on weight are considered and the bases for offers on optimization of configuration of elements of link of torak and the balance weight which will allow will be raised by reliability of links without further increase in weight.
Keywords: running gear, torak, balance weight, destruction, tension, tension.


2.
category: Protection against climatic and microbiological degradations
УДК 621.793.1
The analysis and forecasting of operational damages of coverings of TiN at influence of climatic factors and corrosion and active environments
Effect of vacuum ion plasma coating parameters on part operation abilities was studied. Comparative analysis showed an insufficiency of coating perfection factors specified by drawing technical requirements and parameters and parameters required to provide parts operation abilities. Studies Quality specifications of TiN coated parts working under influence of climatic factors and corrosion-active media were developed. The necessity of standard preparation re-gulating coating perfection factors was established.
Keywords: surface roughness, coating thickness, microhardness.


3.
category: Testing of materials and structures
УДК 620.179.18:620.172.2
Express mechanical characteristics control of aluminum alloys and their welds
A new method of aluminum alloys and their welded joints mechanical properties determination is developed. The method is based on the instrumented indentation test with the registration of “load – displacement” curve during loading and unloading. This method allows to evaluate the yield stress, ultimate stress and ultimate uniform elongation of metal in local zones of welded joints as well as to find the weakest area in the joint. The experimental approbation of the proposed method on hardenable and non-hardenable aluminum alloys was realized.
Keywords: aluminum alloys, mechanical characteristics, indentation diagrams.


4.
category: Testing of materials and structures
УДК 621.45:629.76:620.49.
Features of growth of cracks in the pipeline unloadings of the booster pump of fuel ZhRD
It is shown that the fracture of pipelines occur on the fatigue mechanism. Finite element method of calculation of the SDC (stress deformation condition) pipeline under the influence of internal pressure was used. The mechanism of crack growth, and it is shown that the main cause of the fracture were of the dynamic stresses are high-level, dependent of the internal pressure and the size of oval tube bends in the pipeline. It was found that the conduit having a bend in the pipe ovality of not more than 0,4 mm has a grate resource when CT (control tests), of not less than 3600 s.
Keywords: pipeline, ovality of pipeline, fatigue cracks, pressure impulses, cavitations wear.


5.
category: Testing of materials and structures
УДК 621.787:539.319
The computing-experimental method of surface hardened parts endurance limit prediction
The possibility of cylindrical specimens made of steel 30ХГСА and D16-T alloy with circular cuts of 0,3 mm radius endurance limit prediction after outstripping superficial plastic deforming (hydro shot blasting) by the residual stresses (initial deformations) of reference specimens (bushes of 51,5/45 mm/mm diameter) hardened simultaneously with the smooth specimens has been examined using the computing-experimental method carried out by the authors. The difference between the compressive residual stresses calculated for the cut specimens by the initial deformations of reference specimens and the experimentally found ones doesn’t exceed 6%. Hardened specimens with the cuts endurance limit increases have been calculated using the average integral residual stresses criterion. It’s established that the values of the cut specimens endurance limit increase under bending in the case of symmetric cycle calculated using the carried out computing-experimental method differ from the experimental
Keywords: surface hardening, endurance limit, reference specimen, initial deformations.


6.
category: Structural metallic materials
УДК 539.3
BRAKING OF SMALL CRACKS BY OVERLOADS IN STEELS WITH DIFFERENT STRUCTURE AT CYCLIC LOADINGS
The influence of congestion on the propagation of small fatigue cracks in steels with different structural state and mechanical properties.
Keywords: structural damage, fatigue cracks, overload.


7.
category: Testing of materials and structures
УДК 620.192.6
COMPARATIVE ANALYSIS OF RESULTS THE AUTOMATED NONDESTRUCTIVE CONTROL
Questions of accuracy determination areas of defects by automation process nondestructive control is very important, that be needed analysis process of scanning in point of view evaluation highest possible result nondestructive testing. In this article examine question calculation precision space artificial flaw by automatize ultrasonic flaw detection construction with noncontact passing method. To be execute theoretical calculation possible error flaw area by use scanning system. Showing experimental facts, complete estimate measurement inaccuracy. Execute critical evaluation of final result working data.
Keywords: noncontact flaw detection, automation, precision flaw evaluation.


8.
category: Testing of materials and structures
УДК 621.669.296.011
Mastering of procedure and estimation of threshold stress intensity factor K1н in dhc tests of Zircaloy-4 cladding tube
Proposed new procedure of testing cladding tubes for determination of threshold stress intensity factor (K1н) during delayed hydride cracking (DHC). In the range of temperatures 228–303°C determined temperature dependence K1н and assessment of DHC velocity for the hydrogenated Zircaloy-4 fuel cladding.
Keywords: delayed hydride cracking (DHC), threshold stress intensity factor (K1н), DHC velocity, method, specimen, fuel cladding, load, displacement, crack.


9.
category: Testing of materials and structures
УДК 629.113
RATED PILOT STUDIES OF MECHANICS OF DESTRUCTIONS OF LOAD-CARRYING STRUCTURES OF THE LAND VEHICLES EXECUTED FROM METAL AND NON-METALLIC MATERIALS
The paper presents the results of computational and experimental research of fracture mechanics of ground vehicles bearing structures (such as shift buses) in emergency static and dynamic loads conditions in accordance with international regulations.
Keywords: elastoplastic fracture, deformation, sandwich panels.