scholarly journals The problem solution of deformable power surfaces from anisotropic material interaction in elements of structure constructions

2018 ◽  
Vol 196 ◽  
pp. 02013
Author(s):  
Boris Ivanov ◽  
Alexander Pischulev ◽  
Galina Reazanova
Keyword(s):  
Anisotropic Material ◽  
Complex Form ◽  
Strength Properties ◽  
Problem Solution ◽  
Method Of Calculation ◽  
Strain Behaviour ◽  
Metal Products ◽  
Anisotropic Elastic ◽  
Bridge Bearings ◽  
Material Interaction

The paper presents an analytical method of examining deformable power surfaces from anisotropic material and their interaction. Materials with anisotropic properties are often used in the elements of transport structures as well as in building construction [1-7]. Most frequently the following materials are used in construction: rolled metal products, products obtained by drawing, wires of various kinds, reinforced concrete structures, bridge bearings, supporting walls and other structures, composite materials, plastics and other [8-13]. For forecasting strength properties of structures strength joints and their behaviour under various external influences, the authors developed a method of calculation of their stress-strain behaviour [9]. This method can be applied to strength joints of complex form made of anisotropic elastic elements under specific conditions of deformation of the contact surfaces.

Deformation and strength properties of some rocks in southern Ontario

1979 ◽  
Vol 16 (1) ◽  
pp. 108-120 ◽  
Author(s):  
K. Y. Lo ◽  
M. Hori
Keyword(s):  
Deformation Behaviour ◽  
Strength Properties ◽  
Compression Tests ◽  
Underground Structures ◽  
Southern Ontario ◽  
Analysis And Design ◽  
Rock Types ◽  
Anisotropic Elastic ◽  
Geological Formations ◽  
Independent Parameters

Uniaxial compression tests were performed on sedimentary rocks of five different geological formations at various sites in southern Ontario. The deformation behaviour is analysed in terms of the cross-anisotropic elastic theory and typical sets of five independent parameters for each rock unit have been obtained. It is shown that some of the rock types are significantly anisotropic both in deformation and strength behaviour. The practical relevance of the results in the analysis and design of underground structures in these rocks is discussed.

scholarly journals Normal and Tangential Contact Between Anisotropic Materials

2011 ◽  
Author(s):  
C. Bagault ◽  
M.-C. Baietto ◽  
D. Ne´lias
Keyword(s):  
Contact Problem ◽  
Contact Mechanics ◽  
Anisotropic Material ◽  
Analytic Solutions ◽  
Anisotropic Materials ◽  
Contact Model ◽  
Problem Solution ◽  
Tangential Contact ◽  
Anisotropic Problems ◽  
Recent Developments

A contact model using semi analytic methods, relying on elementary analytic solutions, has been developed. It is based on numeric techniques adapted to contact mechanics, with strong potential for inelastic, inhomogeneous or anisotropic problems. Recent developments aim to quantify displacements and stresses of an anisotropic material which is in contact with another anisotropic material. The influence of symmetry axes on the contact problem solution will be more specifically analyzed.

scholarly journals Frozen Meat-Containing Semi-Finished Minced Products: Biopolymer Packaging Materials

2021 ◽  
Vol 51 (1) ◽  
pp. 6-16
Author(s):  
Igor Korotkiy ◽  
Elena Korotkaya ◽  
Aleksandr Rasshchepkin ◽  
Gulnar Sahabutdinova
Keyword(s):  
Cold Storage ◽  
Storage Time ◽  
Corn Starch ◽  
Strength Properties ◽  
Freezing Process ◽  
Method Of Calculation ◽  
Freezing Method ◽  
Minced Meat ◽  
Biopolymer Film ◽  
And Storage

Introduction. Meat-containing semi-finished minced products demonstrate a wide variety of properties, as they contain both plant and meat components. This heterogeneity makes it difficult to plan the freezing process. In view of the current environmental situation, packaging films used for cold storage should be biodegradable. The effect of low-temperature freezing and storage on biodegradable polymers remains understudied. The research objective was to find the optimal modes for minced-meat semi-finished products frozen in a biopolymer package. Study objects and methods. The study featured zrazy, or meat balls, with vegetable filling and a biopolymer film based on corn starch. It involved a laboratory combination freezing and storage cabinet and an XLW(M) tension tester to establish the physical properties of the film. Results and discussion. The meat-containing semi-finished minced products were vacuum-packaged in biopolymer material and subjected to convection, contact, and combined freezing. The experiments resulted in a new combined method of freezing for biopolymer-packaged semi-finished meat-containing products. The research also tested the strength properties of the CornBag biopolymer film during freezing and cold storage. The paper introduces a graphoanalytic method of calculation of freezing time. Conclusion. The new combined freezing method involved vacuum packaging, air-blast subfreezing, and further freezing on a refrigerated plate. The biopolymer film proved suitable for freezing and cold storage of food products. It keeps the product from drying, reduces vitamin losses, and preserves sensory properties. The optimal storage mode was –18°C, the maximum storage time – 6 months. The improved freezing technology combined freezing method with convective air-blasting and contact freezing on a refrigerated plate for products pre-packaging in a biopolymer vacuum bag. The optimal freezing parameters: temperature = –40°С, time = 85 min, rate = 1.33 cm/h.

Micro-, Macromechanical and Aeroelastic Investigation of Glass-Fiber Based, Lightweight Turbomachinery Components

2020 ◽  
Author(s):  
Senad Iseni ◽  
Mahesh Ramaswamy Guru Prasad ◽  
Alexander Hartmaier ◽  
Klaudiusz Holeczek ◽  
Niels Modeler ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Glass Fiber ◽  
Elastic Properties ◽  
High Speed ◽  
Fiber Composite ◽  
Strength Properties ◽  
Reinforcement Structure ◽  
Distributed Propulsion ◽  
Anisotropic Elastic ◽  
Aero Engines

Abstract A major technical challenge for modern aero engines is the development of designs which reduce noise and emission whilst increasing aerodynamic efficiency and ensuring aeroelastic stability of low-temperature engine components such as fans and low-pressure compressors. Composites are used in aviation due to their excellent stiffness and strength properties, which also enable additional flexibility in the design process. The weight reduction of the turbomachine components, due to composite materials and lighter engines, is especially relevant for the design and developments of hybrid-electric or distributed propulsion systems [1]. To accomplish this, a representative volume element (RVE) of a glass-fiber reinforced polymer is created, describing the geometrical arrangement of the textile reinforcement structure within the polymer matrix. For both phases, realistic linear elastic properties are assumed. This RVE will be investigated with the finite element method under various loading conditions to assess its anisotropic elastic properties and also its damping behaviour for elastic waves. To study the influence of delamination on the mechanical properties, small defects will be introduced into the model at the interface between reinforcement and matrix. Based on this micromechanical approach, a constitutive model for the composite will be formulated that describes the anisotropic properties as well as the damping behaviour. This constitutive model is then used to describe the material response in a macro-mechanical model, which serves as the basis for an aeroelastic analysis of a 1/3-scaled high-speed fan using a conventional (Ti-6Al-4V) and fiber composite material.

Some geotechnical characteristics of fragmented Queenston Shale

1985 ◽  
Vol 22 (3) ◽  
pp. 403-408 ◽  
Author(s):  
R. H. Caswell ◽  
B. Trak
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Shear Strength ◽  
Granular Material ◽  
Key Words ◽  
Strength Properties ◽  
Stress Strain ◽  
Triaxial Apparatus ◽  
Geotechnical Characteristics ◽  
Strain Behaviour

This paper presents the results of an experimental study to determine the stress–strain behaviour of fragmented Queenston Shale from Russell, Ontario and to investigate how its strength properties altered when the material was subjected to repeated slaking cycles. Slaking tests showed that large (cobble-size) blocks of the material degrade rapidly to a particle size of 20 mm upon exposure to water and air. Consolidated drained tests in a large triaxial apparatus under monotonic loading conditions on specimens of fresh and slaked material were performed. They indicate that the shear strength of fragmented Queenston Shale of particle size smaller than 20 mm is not affected by slaking. Key words: Queenston Shale, compaction shale, granular material, rockfill, slaking, shear strength, consolidated drained tests.

scholarly journals Factors of radial bone strength after marginal defect formation

2021 ◽  
Vol 27 (2) ◽  
pp. 187-198
Author(s):  
N.M. Aleksandrov ◽  
◽  
V.D. Veshutkin ◽  
A.E. Zhukov ◽  
I.D. Veshaev ◽  
...  
Keyword(s):  
Bone Strength ◽  
Defect Formation ◽  
Strength Properties ◽  
Affecting Factors ◽  
The Finite Element Method ◽  
Calculation Methods ◽  
Strain Behaviour ◽  
Intact Bone ◽  
Normal Strength ◽  
Radial Bone

Purpose To determine the effect of biometrical parameters of the radial bone and due to edge defect formed on the radius strength properties using calculation methods. Materials and methods The study of bone strength affecting factors was conducted with the aid of experimental and calculation methods. Biometrical parameters were studied in 10 pairs of the human cadaveric radius as an intact bone initially and after the formation of rectangular or triangle-shaped edge cuts. To determine the stress-strain behaviour, mathematical calculations were performed based on the beam flexural theory for isotropic materials. Computation study were conducted using the finite element method with the NX Siemens software package. Based on assumed mathematical models, the actual areas of safe loads in the presence of cuts and values of destructive loads depending on the depth and shape of a cut taking into account the initial curvature of the bone as well as the criteria of a required residual strength in variation of influencing parameters were identified by means of calculations. Results It was established that an increase in bone curvature results in the reduction of longitudinal destructive loads and in increasing values of the normal strength. The 0.05 bone curvature combined with the 0.5 cut causes a decrease in the ultimate load by 20 times (up to 4.8 % for a rectangular cut and to 5.4 % for a triangular cut). A 0.5-deep cut in the bone which curvature is 0.05 enhances the normal stress by 6.9 times for a triangular cut and by 7.8 times for a rectangular one as compared to a bone without curvature. The critical values for the curvature and depth of the cut were established which permit to avoid additional bone reinforcement. Conclusion The strength of the radius with a maginal defect depends not only on the depth of a cut but on its location, shape and on the radius curvature.

Modern Packaging Materials for Steel Products

2017 ◽  
Vol 265 ◽  
pp. 1040-1047 ◽  
Author(s):  
L.G. Kolyada ◽  
E.V. Tarasyuk ◽  
S.A. Krylova
Keyword(s):  
Corrosion Resistance ◽  
Chloride Ion ◽  
Strength Properties ◽  
Packaging Materials ◽  
Rolled Steel ◽  
Protective Properties ◽  
Production Processes ◽  
Cold Rolled ◽  
Metal Products ◽  
Packaging Paper

The paper investigates structural, physical, deformation, strength, barrier, and corrosion resistance properties of domestic packaging papers in comparison with Fislage's foreign equivalent. It studies packaging paper protection of cold-rolled steel under different relative humidity, periodic humidity concentration, and available chloride ion conditions. The corrosion resistance properties of BLIK paper with UNI inhibitor are proven to match those of the foreign equivalent previously used. The EuroBum's packaging paper has poorer protective properties possibly due to the lower corrosion inhibitor content. The competitive recovery of domestic combined packaging materials for metal products can be improved by changing their production processes: increasing inhibitor content, creeping ratio of the paper base and reinforcement in order to obtain better deformation and strength properties.

scholarly journals Study of strength properties of semi-finished products from economically alloyed high-strength aluminium-scandium alloys for application in automobile transport and shipbuilding

2018 ◽  
Vol 8 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Vladimir Baranov ◽  
Sergey Sidelnikov ◽  
Evgeny Zenkin ◽  
Viktor Frolov ◽  
Denis Voroshilov ◽  
...  
Keyword(s):  
Metal Flow ◽  
High Strength ◽  
Rolling Process ◽  
Strength Properties ◽  
Cast Billet ◽  
Total Degree ◽  
Degree Of Deformation ◽  
Deformed State ◽  
Metal Products ◽  
Hot And Cold Rolling

Abstract The results of a study on the strength of rolled products from aluminium alloys doped with scandium under various processing conditions of hot and cold rolling are presented. The regularities of metal flow and the level of strength of deformed semi-finished products from aluminum-scandium alloys are established, depending on the total degree of deformation and the various modes of single reduction during rolling. It is shown that when using one heating of a cast billet to obtain high-quality semi-finished products, the temperature during the rolling process should not be lower than 350-370°, and the total degree of deformation does not exceed 50-60%. It was found that the semi-finished products from alloys with a content of scandium in the range 0.11-0.12% in the deformed state had elevated values of ultimate tensile strength and yield strength of the metal, which allows them to be recommended for industrial production of sheet metal products.

scholarly journals Modeling of random anisotropic elastic media and impact on wave propagation

2010 ◽  
pp. 241-253
Author(s):  
Quang-Anh Ta ◽  
Didier Clouteau ◽  
Régis Cottereau Cottereau
Keyword(s):  
Wave Propagation ◽  
Anisotropic Material ◽  
Tensor Field ◽  
Elasticity Tensor ◽  
Positive Definite ◽  
Elastic Media ◽  
New Model ◽  
Anisotropy Index ◽  
Anisotropic Elastic ◽  
Non Gaussian

The class of stochastic non-gaussian positive-definite fields with minimal parameterization proposed by Soize (Soize, 2006) to model the elasticity tensor field of a random anisotropic material shows an anisotropy index which grows with the fluctuation level. This property is in contradiction with experimental results in geophysics where the anisotropy index remains limited whatever the fluctuation level. Hence, the main purpose of this paper is to generalize the Soize’s model in order to account independently for the anisotropy index and the fluctuation level. It is then shown that this new model leads to major differences in the wave propagation regimes.

scholarly journals Contact Analyses for Anisotropic Half Space With an Anisotropic Coating

2012 ◽  
Author(s):  
C. Bagault ◽  
D. Nélias ◽  
M.-C. Baietto ◽  
T. Ovaert
Keyword(s):  
Half Space ◽  
Elastic Half Space ◽  
Rigid Sphere ◽  
Manufacturing Processes ◽  
Problem Solution ◽  
Numerical Techniques ◽  
General Anisotropy ◽  
Recent Developments ◽  
Anisotropic Elastic ◽  
Wear Coatings

For most composite and mono-crystal materials their compositions or the elaboration and manufacturing processes imply that it exists one or two main directions or even a general anisotropy. Moreover, coatings are often used to prevent or control wear. Coatings do not have, generally, the same properties as the substrate and may have various thicknesses. The influence of the anisotropy orientations (in the coating and in the substrate) have to be taken into account to better predict the distribution of the contact pressure and the subsurface stress-field in order to optimize the service life of industrial components. A contact model using semi analytical methods, relying on elementary analytical solutions, has been developed. It is based on numerical techniques adapted to contact mechanics. Recent developments aim to quantify displacements and stresses of a layered anisotropic elastic half space which is in contact with a rigid sphere. The influence of material properties and layer thickness on the contact problem solution will be more specifically analyzed.

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