scholarly journals Villari Effect at Low Strain in Magnetoactive Materials

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2472 ◽  
Author(s):  
Graciela Riesgo ◽  
Laura Elbaile ◽  
Javier Carrizo ◽  
Rosario Díaz Crespo ◽  
María Ángeles García ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnetic Flux ◽  
Cross Section ◽  
Magnetic Particles ◽  
Magnetic State ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
The Cross ◽  
Silicone Matrix ◽  
Villari Effect

Magnetic composites of soft magnetic FeGa particles embedded in a silicone matrix have been synthesized. The Villari effect has been studied depending on the size and concentration of the particles and on the magnetic state of the composite. The results indicate a decrease in the Villari effect when the concentration of the magnetic particles increases. These results suggest a relationship between the Villari effect and the mechanical properties of the composites. The Young’s modulus of the composites has been obtained by microindentation and their values related to the intensity and slope of the Villari signals. The results are explained on the basis that the reduction in the cross section of the composite when submitted to stress is the main origin of the variation of the magnetic flux in the Villari effect in this kind of composite. It has also been obtained that the magnetic state of the composite plays an important role in the Villari signal. When the magnetization of the composite is greater, the magnetic flux across the composite is greater too and, so, the same reduction in the cross section originates a greater Villari signal.

Preliminary Research on Mechanical Properties of FRP-Reinforced Bamboo Beams

2011 ◽  
Vol 243-249 ◽  
pp. 1237-1241 ◽  
Author(s):  
Yang Wei ◽  
Guo Fen Li ◽  
Shen Xue Jiang ◽  
Qi Sheng Zhang ◽  
Qing Fang Lv
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Structure Design ◽  
Bamboo Fiber ◽  
Control Specimen ◽  
Tension Zone ◽  
Reinforced Beams ◽  
Preliminary Research ◽  
The Cross ◽  
Frp Bars

FRP bars were used to improve the mechanical properties of bamboo beams for civil engineering without changing the existing bamboo processing technology in this paper. Three bamboo beams, including one control beam and two FRP-reinforced beams were tested. The effects of various types of FRP bars were compared, including CFRP and BFRP. The results show that the ultimate displacements of reinforced specimens are less than the control specimen. The FRP bars can enhance effectively the cross-section stiffness of bamboo beams. CFRP bars can reduce about 30% strain and BFRP bars can also reduce about 10% strain for the tensile bamboo fiber. The FRP bars in the tension zone can share tensile stress of bamboo fiber. The cross-section stiffness still controls the structure design for the FRP bars reinforced bamboo beams.

Semicrystalline Structure and Mechanical Properties of Polyolefin-Based Materials

2012 ◽  
Vol 441 ◽  
pp. 713-716
Author(s):  
Mizue Kuriyagawa ◽  
Koh Hei Nitta
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Draw Ratio ◽  
Structural Model ◽  
Point Of View ◽  
Cross Sectional ◽  
Molecular Weights ◽  
The Cross ◽  
Sectional Shape ◽  
Structural Point

The mechanical yielding and necking behaviors of metallocene-catalyzed high density polyethylenes were investigated from a structural point of view. In particular the natural draw ratio was investigated with different crosshead speeds, molecular weights, and the cross-section shapes of sample specimens. We proposed a structural model for explaining the necking formation in addition to the molecular weight and the cross-sectional shape dependences of the natural draw ratio.

scholarly journals COLD ROLLING OF PRE-PROFILED STRIP FROM ALUMINUM ALLOY EN AW-1050

2020 ◽  
pp. 93-101
Author(s):  
Serhii Bondarenko ◽  
Olexandr Grydin ◽  
Yaroslav Frolov ◽  
Olga Kuzmina ◽  
Oleksandr Bobukh
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Cold Rolling ◽  
Cross Section ◽  
Steel Strip ◽  
Experimental Studies ◽  
Cold Plastic Deformation ◽  
Aluminum Strip ◽  
The Cross

Specialists of metallurgy and mechanical engineering are intensively working at materials with controlled properties. In fact, at this stage we are already talking about the design of new materials for the specific tasks of the industry. One of the ways to achieve the regulated mechanical properties of metal products is to use the influence of plastic deformation with its different parameters in individual sections of the deformable material. In this study, we studied the effect of cold rolling on the properties of a strip of aluminum alloy EN AW-1050 with artificially created differences in the deformation parameters in different parts of the cross section of the profile. For this, a pre-shaped sample was prepared by conducting joint cold rolling of a strip of the specified material 420 mm long, 180 mm wide and 2.9 mm thick with a steel profiling tape 80 mm wide and 2 mm thick superimposed on it (length of an aluminum strip and steel profiling tape are the same). As a result of joint deformation, the steel strip rolled into the base metal and changed the geometry of the cross section and the properties of the obtained strip. Next, the obtained strip was subjected to heat treatment and rolled in a duo mill. After rolling, thin samples were made from fabricated flat strips to assess mechanical properties, in particular tensile tests were performed according to ISO 6892-1: 2009 and Brinell hardness tests were performed according to ISO 6506-1: 2014. Experimental studies of cold rolling of strips with profiled cross section of aluminum alloy EN AW-1050 were carried out. The possibility of forming heterogeneous properties in a flat aluminum strip by cold plastic deformation is shown and the maximum average values of the increase in the main indicators of mechanical properties on individual elements of the strip are determined. The maximum difference between the mechanical properties of the thick and thin elements of the profiled strip is observed in the hardness index and reaches 37.5%. The maximum obtained average value of the increase in yield strength and tensile strength is 26% and 18%, which is achieved with true deformation of the thick element of the profiled strip 0.165 and 0.234.

scholarly journals PRODUCTION TECHNOLOGY AND MECHANICAL PROPERTIES OF A NEW GRADE OF STEEL FOR FORGINGS WITH INCREASED STRENGTH AND IMPACT STRENGTH

2021 ◽  
Vol 72 (4) ◽  
pp. 15-21
Author(s):  
Marek Burdek ◽  
Jarosław Marcisz ◽  
Jerzy Stępień
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Impact Strength ◽  
Cross Section ◽  
Production Technology ◽  
Numerical Calculations ◽  
Steel Composition ◽  
The Cross ◽  
Increased Strength

The study involved the development of the basics of production technology and the testing of the mechanical properties of a new grade of steel for forgings with increased strength and impact strength, intended for special products. The scope of the tests includ-ed a proposal for a new steel composition along with the production of ingots and its further processing into forgings in industrial con-ditions, using an input with various dimensions of the cross-section, proposed as a result of numerical calculations, including the performance of heat treatment in two variants. As a result of tests and analyses, it was found that the proposed technology enables the production of semi-finished products with the assumed level of strength and impact strength.

scholarly journals Pattern of ray arrangement on cross section of bark of Aesculus

2014 ◽  
Vol 49 (4) ◽  
pp. 415-422
Author(s):  
Władysław Pyszyński
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
The Core ◽  
The Cross ◽  
The Right

The arrangement of rays within the phloem and rhytidome was studied in <em>Aesculus</em> stems. It was found that on the cross section most rays in the stem deviate in Z-direction, that is to the right from the geometric radius. The mechanism of Z-arrangement of the rays may be as follows: owing to the action of wind on the crown torques arise causing the torsion of the wood core. The dissymmetry of the mechanical properties of the Aesculus wood core leads to accumulation of residual Z-torsion, and as consequence of this wood core torsion to the right occurs when seen from above. In the course of this torsion the soft phloem layers lying between the column and the rigid shield of the outer tissues (rhytidome and outher sclerified phloem layers) are drawn by the core and this results in their deviation to the right in respect to the geometrical radius.

scholarly journals Distributed Magnetic Flux Density on the Cross-Section of a Transformer Core

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 297 ◽  
Author(s):  
Lingzhi Li ◽  
Xuhao Du ◽  
Jie Pan ◽  
Adrian Keating ◽  
David Matthews ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Cross Section ◽  
Air Gap ◽  
Magnetic Flux Density ◽  
The Core ◽  
The Cross ◽  
Flux Density Distribution ◽  
Transformer Core ◽  
The Relationship

In this paper, the magnetic flux density distribution on the cross-sections of a transformer core is studied. The core for this study consists of two identical U-shaped cores joint at their open surfaces with known air gaps. The magnetic flux density at one of their joint boundary surfaces was measured for different air gaps. A finite element model (FEM) was built to simulate the magnetic flux density and compared with experiment data. Using the validated FEM, the distributed magnetic flux density on the cross-section of the core structure can be obtained when the air gap approaches zero. An engineering model of the density based on the Ampere’s circuit law was also developed and used to explain the relationship between air gap and mean magnetic flux density on the cross-section. The magnetic flux density on the cross-section was found to have a convex-shaped distribution and could be described by an empirical formula. Using this approach, the magnetic flux density distribution in cores with different interlayer insulation was obtained and discussed. This method could also examine the leakage of magnetic flux density in the air gap region when the distance is non-zero, and the relationship between the leakage field and the field in the core structure. The proposed method and model can provide a more detailed understanding for the magnetic field of transformer cores and potential application in designing quiet transformers and condition monitoring.

Thermo-Mechanical Treatment to Improve Properties of Sisal Fibres for Composites

2010 ◽  
Vol 636-637 ◽  
pp. 253-259 ◽  
Author(s):  
L.A.C. Motta ◽  
Vanderley M. John ◽  
Vahan Agopyan
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Cross Section ◽  
Mechanical Treatment ◽  
Moisture Absorption ◽  
Thermo Mechanical Treatment ◽  
The Cross

The cross section variation, mechanical properties and moisture absorption of vegetable sisal fibres compressed at temperatures of 120, 160 and 200 °C were determined and compared with values obtained in non-compressed fibres. The thermo-mechanical treatment carried out resulted in a relevant increasing of fibre stiffness (elastic modulus) and decreasing of fibre moisture absorption.

scholarly journals Fibre Reinforced Thermoplastic Composite Rods

2012 ◽  
Vol 730-732 ◽  
pp. 331-336 ◽  
Author(s):  
Veronika Kling ◽  
Sohel Rana ◽  
Raul Fangueiro
Keyword(s):  
Mechanical Properties ◽  
Optical Microscopy ◽  
Cross Section ◽  
High Performance ◽  
Thermoplastic Composite ◽  
The Core ◽  
Glass Fibres ◽  
Thermoplastic Matrix ◽  
Innovative Technique ◽  
The Cross

The present investigation is concerned with the development of fibre reinforced thermoplastic composite rods using braiding process. An innovative technique has been developed to produce composite rods with outer braided layer of polyester fibres and axially reinforced with high performance glass fibres. Polypropylene filaments which were introduced in to the core along with the glass fibres during the braiding process formed the thermoplastic matrix upon melting. A special mould has been designed for uniform application of heat and pressure during the consolidation of the composite rods as well as for the alignment of core fibres. The cross-section of composite rods was characterized with help of optical microscopy in order to see the distribution of core fibres and matrix. The effect of amount of glass fibres on the mechanical properties (tensile and flexural) of composite rods has been investigated and discussed.

scholarly journals Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6844
Author(s):  
Emir Pošković ◽  
Fausto Franchini ◽  
Luca Ferraris ◽  
Elisa Fracchia ◽  
Jana Bidulska ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
State Of The Art ◽  
Inorganic Materials ◽  
Organic Layer ◽  
Soft Magnetic ◽  
Research Activity ◽  
Magnetic Composites ◽  
Recent Advances ◽  
Starting Point ◽  
Soft Magnetic Composites

During the past 50 years, the aim to reduce the eddy current losses in magnetic cores to a minimum led to the formulation of new materials starting from electrically insulated iron powders, today called Soft Magnetic Composites (SMC). Nowadays, this promising branch of materials is still held back by the mandatory tradeoff between energetic, electrical, magnetic, and mechanical performances. In most cases, the research activity focuses on the deposition of an insulating/binding layer, being one of the critical points in optimizing the final composite. This insulation usually is achieved by either inorganic or organic layer constituents. The main difference is the temperature limit since most inorganic materials typically withstand higher treatment temperatures. As a result, the literature shows many materials and process approaches, each one designed to meet a specific application. The present work summarizes the recent advances in state of the art, analyzing the relationship among material compositions and magnetic and mechanical properties. Each coating shows its own processing sets, which vary from simple mechanical mixing to advanced chemical methods to metallurgical treatments. From state of the art, Aluminum coatings are characterized by higher current losses and low mechanical properties. In contrast, higher mechanical properties are obtained by adopting Silicon coatings. The phosphates coatings show the best-balanced overall properties. Each coating type was thoroughly investigated and then compared with the literature background highlighting. The present paper thus represents a critical overview of the topic that could serve as a starting point for the design and development of new and high-performing coating solutions for SMCs. However, global research activity continuously refines the recipes, introducing new layer materials. The following steps and advances will determine whetherthese materials breakthrough in the market.

scholarly journals Study of the hardness distribution after induction heat treatment of titanium over the surface and the cross-section

2021 ◽  
Vol 2086 (1) ◽  
pp. 012208
Author(s):  
A Shchelkunov ◽  
I Egorov ◽  
A Fomin
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cross Section ◽  
Processing Parameters ◽  
Hardness Distribution ◽  
Induction Heat ◽  
Induction Heat Treatment ◽  
The Cross ◽  
Titanium Disk

Abstract In this work, the mechanical properties (microhardness) of a titanium disk after induction heat treatment (IHT) were studied. The influence of the processing parameters (inductor current and temperature) on the distribution of microhardness over the cross-section of the experimental samples was established.

Sign in / Sign up

Export Citation Format

Share Document