Aerospace series. Fibre reinforced plastics. Determination of the effect of exposure to humid atmosphere on physical and mechanical characteristics

2017 ◽  
Keyword(s):  
Mechanical Characteristics ◽  
Humid Atmosphere ◽  
Reinforced Plastics ◽  
Physical And Mechanical Characteristics

Study on the Effects of Heat Treatments on the Physical and Mechanical Characteristics of 1.4301 Stainless Steel

2021 ◽  
Vol 42 ◽  
pp. 57-62
Author(s):  
Maria Stoicănescu
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Stainless Steels ◽  
Mechanical Characteristics ◽  
Austenitic Stainless Steels ◽  
Heat Treatments ◽  
Hot Plastic Deformation ◽  
Improved Characteristics ◽  
Physical And Mechanical Characteristics

The 1.4301 stainless steel is part of the category of austenitic stainless steels, steels which do no undergo heat treatments in general, as they are intended for hot plastic deformation in particular. The aim of the research presented in this paper was to obtain significantly improved characteristics of the resistance properties in relation to the values obtained under classical conditions, by applying heat treatments. Samples taken from the delivery state material underwent annealing, quenching and ageing heat treatments. Subsequently, the samples thus treated were subjected to tests enabling the determination of the correlations between the heat treatment parameters, the structure and the properties.

scholarly journals Study of the nature of the dynamic coefficient of internal friction of grainmaterials

2019 ◽  
Vol 135 ◽  
pp. 01102
Author(s):  
Dmitriy Savenkov ◽  
Oleg Kirischiev ◽  
Ylia Kirischieva ◽  
Tatiana Tupolskikh ◽  
Tatiana Maltseva ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Internal Friction ◽  
Agricultural Production ◽  
Mechanical Characteristics ◽  
Dynamic Coefficient ◽  
Bulk Materials ◽  
Dynamic Coefficients ◽  
Internal Friction Coefficient ◽  
Physical And Mechanical Characteristics

The article highlights the issues related to the study of physical and mechanical characteristics of bulk materials, namely internal friction coefficients in static and dynamic modes. An innovative device of the carousel type for determining the frictional characteristics of bulk materials is described, which allows to implement the tasks of practical determination of dynamic coefficients of internal friction. Presented the program, methodology and results of research on the practical study of the internal friction coefficient of typical bulk products of agricultural production in the range of linear velocities of displacement of layers from 0 to 2.79 m/s, the reliability of which is not lower than 0.878.

Load-Bearing Capacity Determination of Historic Masonry Structures

2014 ◽  
Vol 923 ◽  
pp. 81-84 ◽  
Author(s):  
Jiří Witzany ◽  
Tomáš Čejka ◽  
Radek Zigler
Keyword(s):  
Mechanical Characteristics ◽  
Masonry Wall ◽  
Probabilistic Methods ◽  
Laboratory Research ◽  
Historic Masonry ◽  
Historical Masonry ◽  
Non Destructive ◽  
Physical And Mechanical Characteristics

The experimental, in-situ and laboratory research has manifested a relatively large variance of the physical and mechanical characteristics of historical masonry found e.g. within a masonry wall, a massive masonry pillar etc. Artical presents the evaluation of the experimentally determined physical and mechanical characteristics of masonry members and the binder obtained by sampling specimens and by non-destructive measurements relies on the application of appropriate probabilistic methods.

Determination of the Parameters of the Target Heterogeneous Medium During Centrifugal Arc Dispersion of Hard Alloys

2021 ◽  
pp. 50-57
Author(s):  
K.M. Kolmakov ◽  
A.E. Zverovshchikov ◽  
A.G. Skhirtladze ◽  
A.V. Sokolov
Keyword(s):  
Mechanical Characteristics ◽  
Gaseous Medium ◽  
Heterogeneous Medium ◽  
High Density ◽  
Hard Alloys ◽  
Alloy Particles ◽  
Spheroidal Shape ◽  
Shape Of Particles ◽  
Physical And Mechanical Characteristics

The article considers the ballistic parameters of the trajectories of high-density alloy particles moving in a gaseous medium, accompanied by a phase transition of the of the particle material. A technique has been developed for determining the parameters of the target depending on the physical and mechanical characteristics of the materials of the captured particles and target layers. The possibility of maintaining the spheroidal shape of particles during the electric arc dispersion of high-density alloys has been determined.

scholarly journals Study of reinforced elastomeric bearings for structures in seismic areas

2018 ◽  
Vol 193 ◽  
pp. 03009 ◽  
Author(s):  
Larisa Safina ◽  
Aleksandr Shuvalov ◽  
Mikhail Kovalev
Keyword(s):  
Mechanical Characteristics ◽  
Individual Characteristics ◽  
Seismic Protection ◽  
Power Equipment ◽  
Test Rig ◽  
Elastomeric Bearings ◽  
Full Size ◽  
Metal Support ◽  
Physical And Mechanical Characteristics

The article presents the results of the experimental determination of the physical and mechanical characteristics of rubber-metal vibration-proof supports used in the construction of facilities in the areas of increased seismic hazard. The testing was based on two necessities: to substantiate the possibility of using such a constructive seismic protection solution and to create reliable calculation models of the structures with rubber-metal support. More than thirty samples were tested in the laboratory under various loads and impacts. The elastomers were tested in accordance with the requirements written in EN-1337-3. The experiment was performed on three types of elastomer model samples to determine their vertical and horizontal stiffness, the tensile strength and modulus of elasticity and creep. The work was performed on INSTRON power equipment and a test rig equipped with MTS hydraulic jacks installed in the power frame. The testing results of elastomeric support models were confirmed by the determination of individual characteristics on the full size specimens at the corresponding load. Thus, the test has confirmed and proved the validity of the use of elastomeric bearings for seismic protection of a mall construction.

Two Phase Model of Diffusion in Polycrystalline Material

2014 ◽  
Vol 1040 ◽  
pp. 614-619
Author(s):  
Marija V. Chepak-Gizbrekht ◽  
E.V. Shvagrukova
Keyword(s):  
Mass Transfer ◽  
Grain Boundaries ◽  
Mechanical Characteristics ◽  
Polycrystalline Material ◽  
Approximate Analytical Solution ◽  
Boundary Phase ◽  
New Materials ◽  
Two Phase ◽  
Physical And Mechanical Characteristics

Diffusion research is important for understanding of many processes based on mass transfer. In many respects, diffusion, determines physical and mechanical characteristics for new materials with fine-dispersed matter and a large number of grain boundaries and phases. Models of diffusion along grain boundaries and their modifications are widely known in literature, but they are not always applicable to nanomaterials due to indistinct determination of some notions. At the present paper the model of diffusion is presented, which considers boundaries and area near boundaries as a phase with special properties. Mass transfer between the volume of a grain and a boundary phase is taken into account. The approximate analytical solution of the problem is formulated. In the general case the problem is solved numerically. Non monotonic distributions of concentrations in volume are obtained.

scholarly journals The study of the microstructures of clay sediments: a case study of marly sediments from N. Péloponnèse

2018 ◽  
Vol 34 (2) ◽  
pp. 745
Author(s):  
Τ. Α. ΧΡΙΣΤΟΔΟΥΛΟΠΟΥΛΟΥ ◽  
Π. ΤΣΩΛΗ - ΚΑΤΑΓΑ ◽  
Γ. Χ. ΚΟΥΚΗΣ ◽  
Ν. ΚΟΝΤΟΠΟΥΛΟΣ
Keyword(s):  
Mechanical Characteristics ◽  
Structural Characteristics ◽  
Optical Microscope ◽  
Mineralogical Analysis ◽  
Microstructural Characteristics ◽  
Cementing Material ◽  
Physical And Mechanical Characteristics

This paper deals with the systematic study of the microstructural characteristics of clay sediments. These characteristics which are closely connected to the physical and mechanical character of the sediments, are concerned with: a)the structural constituents, b)the microporosity and c)the structural bonds of the sediments. For the determination of the structural characteristics of clay sediments the Scanning Electron Microscope (SEM) and the Optical Microscope are widely used with a supplementary mineralogical analysis of sediment components and the determination of several physical and mechanical characteristics. The observations under the microscope must be focused on the distribution of mineralogical facies and micropores, on the size and shape of clay (micro-)aggregates, as well as on the kind of authigenic facies (e.g. micrite, sparry calcite) which play the role of cementing material. The proposed methodology was applied to the study of the microstructures of marly sediments from Northern Péloponnèse and the following types of microstructures were determined: a)matrix-skeletal, mixed type, coarse dispersed of low orientation, b)matrix, coagulative, medium dispersed of medium orientation and c)crystallized-cementated, fine or medium dispersed of low orientation.

Determination of the Optimal Structure of a Layered Composite Material for Maximum Strength Characteristics

2021 ◽  
Vol 1040 ◽  
pp. 124-131
Author(s):  
Ljubov Aleksandrovna Bokhoeva ◽  
I.O. Bobarika ◽  
A.B. Baldanov ◽  
Vitaly Evdokimovich Rogov ◽  
Anna S. Chermoshentseva
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Mechanical Characteristics ◽  
Minimum Weight ◽  
Layered Composite ◽  
Number Of Layers ◽  
Reinforcing Material ◽  
Intensive Development ◽  
Physical And Mechanical Characteristics

Due to the intensive development of composite materials and technologies for producing parts from them, they are increasingly used in various industries, including the manufacture of products with increased requirements for the characteristics of final products (strength, stiffness, minimum weight, etc.). In this regard, the authors analyzed the possibility to optimize the layered structure of a composite material in order to give it a pronounced predictable anisotropy of properties required for the final product. Thus, the influence of the orientation of the fibers of the reinforcing material in different layers of the package and the number of layers of the package on the physical and mechanical characteristics of the hypothetical product were analyzed. The problem was solved through the example of the development of a wing for a hypothetical UAV.

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