scholarly journals Mechanical Characteristics and Structure of Highly Deformed Zinc

2022 ◽  
Author(s):  
Paweł Ostachowski ◽  
Anna Paliborek ◽  
Włodzimierz Bochniak ◽  
Marek Łagoda
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Grain Size ◽  
Point Defects ◽  
Mechanical Characteristics ◽  
Pure Zinc ◽  
Cyclic Torsion

AbstractThe paper contains a set of experimental data on the influence of the KOBO extrusion (extrusion with simultaneous cyclic torsion) on mechanical properties of pure zinc and proves that they can be controlled in order to achieve the desired final values, while tensile characteristics may either show monotonic course or contain the Lüders-type effect. It has been found that the mechanical properties of the KOBO extruded zinc are not linked to the grain size, thus proving the hypothesis about the dominating role of over-equilibrial concentration of point defects (including their clusters).

Effect of wood particulate size on the mechanical properties of PLA biocomposite

2020 ◽  
Vol 49 (6) ◽  
pp. 465-472
Author(s):  
S. Raj Sachin ◽  
T. Kandasamy Kannan ◽  
Rathanasamy Rajasekar
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Wood Flour ◽  
Wood Particle ◽  
Poly Lactic Acid ◽  
Particle Sizes ◽  
Content Type ◽  
Particulate Size ◽  
Practical Implications

Purpose The purpose of this study is to carry out an investigation of the role of the wood particle size on the mechanical properties of poly lactic acid (PLA)-reinforced neem fiber biocomposite. Design/methodology/approach Composite test specimens were processed by reinforcing neem wood flour (NWF) in two different particle sizes, micro-sized NWF (MNWF) and nano-sized NWF (NNWF) separately into PLA. Composites were extruded at four different fiber loadings (10, 15, 20 and 25 Wt.%) into PLA matrix. The MNWF and NNWF had particle sizes varying from 5 to 15 µm and 10 to 15 nm, respectively. Findings Tensile strength, flexural strength and impact strength of PLA increased with fiber reinforcement for both the MNWF and NNWF cases. The NNWF-reinforced PLA composite at 20 Wt.% fiber loading proved to be the best composite that had outstanding mechanical properties in this research. Practical implications The developed composite can be used as a substitute for conventional plywood for furniture, building infrastructure and interior components for the automobile, aircraft and railway sectors. Originality/value A new biocomposite had been fabricated by using PLA and NWF and had been tested for its mechanical characteristics.

Sintering and Mechanical Properties of Alumina Ceramics Prepared by Nanosize Alumina

2007 ◽  
Vol 544-545 ◽  
pp. 821-824
Author(s):  
Indra ◽  
S.W. Oh ◽  
Hee Joon Kim
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Relative Density ◽  
Mechanical Characteristics ◽  
Indentation Test ◽  
Test System ◽  
Alumina Ceramics ◽  
New Materials ◽  
Size Dependent

This work examined the mechanical properties of alumina that can directly be enhanced by ratio of nano sized alumina powders additives to micro size alumina powders (n/m ratio). These new materials have mechanical properties that are strongly grain size dependent and often significantly different from those of their coarser grained counter parts. The mechanical characteristics of samples were observed by using the indentation test system. This data shows that the relative density for the sample is increased with increasing Meyer hardness.

The Effect of Stoichiometry and Degree of Order on Mechanical Properties of Ni3Fe Intermetallics

2013 ◽  
Vol 747-748 ◽  
pp. 19-24 ◽  
Author(s):  
Ye Xin Chen ◽  
Hai Yan Qian ◽  
Tao Chen
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Phase Composition ◽  
Point Defects ◽  
Deformation Behavior ◽  
Disordered Alloys ◽  
Fe Intermetallics ◽  
Degree Of Order ◽  
Disordered Alloy

The effects of Fe stoichiometry and degree of order on mechanical properties of intermetallics Ni3Fe were investigated. The experimental results showed that the phase composition and the grain size of Ni3Fe alloy was independent on Fe stoichiometry. The Ni3Fe alloy with the normal stoichiometry had the lowest elongation in the ordered and disordered alloys. The tensile strength of Ni3Fe alloy depended on Fe stoichiometry of alloy. The effect of Fe stoichiometry on the mechanical properties of the ordered alloy was larger than that of disordered alloy. There were more point defects in lattice when the alloy stoichiometry deviating from the normal stoichiometry in the Ni3Fe alloy. The changes of the concentration of the point defects and degree of order altered the deformation behavior of the Ni3Fe alloy.

scholarly journals Physical And Mechanical Properties Of Sea Ice In Bending

2016 ◽  
Vol 1 (1) ◽  
pp. 78
Author(s):  
S.V. Koshkin ◽  
N.A. Taranukha
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Sea Ice ◽  
Mechanical Characteristics ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Radius Of Curvature ◽  
Neutral Layer ◽  
Strength Limit ◽  
Actual Stress

<p>The work presents the study of changes in the physical and mechanical properties of sea ice in bending. Strength limit σ<sub>в</sub> and deformation module Е<sub>в</sub> of ice under bending are conditional mechanical characteristics of sea ice. These characteristics do not reflect the actual stress state of ice destruction at the time. The ratio of the module to the strength limit Е<sub>в</sub>/σ<sub>в</sub> determines the relative radius of curvature of neutral layer in the place of ice destruction. It is shown that this ratio increases with the increase of ice temperature. Dependencies for determining of Е<sub>в</sub> and σ<sub>в</sub> of sea ice that generalize the experimental data are obtained.</p>

Recrystallization and Grain Growth Phenomena in Stainless Steels for Different Thermo-Mechanical Processes

2018 ◽  
Vol 941 ◽  
pp. 135-140 ◽  
Author(s):  
Giuseppe Napoli ◽  
Stefano Grimozzi ◽  
Claudia Rocchi ◽  
Andrea di Schino
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Growth ◽  
Stainless Steels ◽  
Mechanical Characteristics ◽  
Volume Fraction ◽  
Primary Recrystallization ◽  
Drag Effect ◽  
Zener Drag ◽  
Steel Grades

The mechanical properties of steels are strictly connected to chemical composition as well as to microstructural features obtained after thermo-mechanical processing. As a consequence, recrystallization and grain growth are relevant to the mechanical properties of steels, thus suggesting the necessity of mathematical models able to predict the microstructural evolution after thermo-mechanical cycles. In particular, in stainless steel grades, mechanical characteristics, and a proper microstructure with an adequate grain size distribution, are very important in order to achieve the required formability and deep drawing properties for many applications. This paper deals with the study of microstructural changes, such as grain size variations and recrystallized volume fraction in stainless steels during isothermal treatments through the application of a mathematical model, able in general to describe the primary recrystallization and grain growth in metals. The developed model takes into account the recrystallization phenomenon and Zener drag effect. A general continuity equation is proposed describing in continuous way recrystallization and grain growth phenomena without taking into account textures effect. The influence of input parameters is analyzed.

scholarly journals Diagnostics of steel structures with the dynamic non-destructive method

2019 ◽  
Vol 279 ◽  
pp. 02003 ◽  
Author(s):  
Alexey Beskopylny ◽  
Andrey Veremeenko ◽  
Alexander Shilov
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Steel Structures ◽  
Dynamic Indentation ◽  
Lower Strength ◽  
Indentation Method ◽  
Element Analysis ◽  
Railway Bridges ◽  
Non Destructive

The method of the assessment of steel structures mechanical properties is considered with the nondestructive test by conical indentation. The nondestructive evaluating of the steel mechanical properties in real structures is widely spread in many applied problems. Dynamic indentation method is one of the most effective because of compatibility and accuracy. For this purpose, the static and dynamic problem of axisymmetric elastic-plastic truncated cone indentation is solved, and the results are compared with finite element analysis and experimental data. The method of nondestructive evaluating of mechanical characteristics is suggested and devise of the realization of the method is tested at real structures. The method is tested on steel railway bridges that are being operated for more than 60 years. As a result, zones with lower strength values were identified, and recommendations for strengthening the design were given.

Graphene oxide as a compatibilizer for polyvinyl chloride/rice straw composites

2017 ◽  
Vol 37 (7) ◽  
pp. 661-670 ◽  
Author(s):  
Mohammad Ali Bagherinia ◽  
Milad Sheydaei ◽  
Masoud Giahi
Keyword(s):  
Mechanical Properties ◽  
Fourier Transform ◽  
Graphene Oxide ◽  
Infrared Spectroscopy ◽  
Rice Straw ◽  
Polyvinyl Chloride ◽  
High Performance ◽  
Mechanical Characteristics ◽  
Physical Interactions

Abstract In this study, polyvinyl chloride (PVC)/rice straw (RS)/graphene oxide (GO) sustainable nanocomposite was prepared using the direct compounding method. Structural, morphological and mechanical properties of fabricated sustainable nanocomposites were compared with unfilled and RS-filled PVC compounds. Mechanical characteristics of PVC decreased with loading RS fibers. The main reason for the mechanical failure of PVC/RS composite is the incompatibility between PVC and RS fibers. GO nanosheets are used here to improve the compatibility between RS fibers and PVC macromolecules. Compared to the neat PVC, maximum strength of the RS/GO-loaded PVC composite increased up to 31%, with incorporating only 1 wt% of GO nanosheets. This enhancement in the mechanical characteristics of PVC/RS/GO nanocomposite can only be due to the role of GO nanosheets as a compatibilizer, as 1 wt% GO loading can only increase the mechanical strength of PVC compounds up to 9%. Fourier transform infrared spectroscopy results are used here to study the nature of these behaviors. It is suggested that the non-covalent and physical interactions between cellulose/hemicellulose portions of RS fibers and GO functional groups result in the enhancement of mechanical characteristics. Consequently, GO can be considered as a new compatibilizer for fabricating high performance PVC-based sustainable nanocomposites.

scholarly journals Some Physico-Mechanical Characteristics of Potato Tubers Used as Seed for Development of Potato Planter

2021 ◽  
Vol 9 (3) ◽  
pp. 305-308
Author(s):  
Yogesh Kumar Kosariya ◽  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Potato Tubers ◽  
Time Consumption ◽  
Potato Planter ◽  
Day By Day

Agriculture mechanization plays very important role for horticulture crops. Role of machineries is increasing day by day. In order to compensate for labour scarcity, reduce labour drudgery and time consumption in manual or traditional sowing of potato tubers, a prototype was designed on the basis of various mechanical properties of potato tubers and the prototype was evaluated in the field. The potato tubers taken were divided into three categories i.e., round, oblong and long-oblong. Different mechanical properties of potato tubers were used for designing different lead units of the potato tubers planter which is used for direct planting of potatoes in prepared seed bed.

scholarly journals Role of nanostructured modifiers in composite corundum ceramics preparation

2019 ◽  
Vol 55 (4) ◽  
pp. 400-414
Author(s):  
T. M. Ulyanova ◽  
N. P. Кrutko ◽  
P. A. Vityaz ◽  
A. A. Shevchenok ◽  
L. V. Оvseenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Pore Space ◽  
Thermal Loads ◽  
Composite Ceramics ◽  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia ◽  
Self Diffusion

Influence of highly disperse nanostructured modifiers of alumina – magnesia, partially stabilized zirconia – on the consolidation processes of composite ceramics of industrial corundum powders annealed at 1600–1700 °C, changes of its microstructure and physico-mechanical properties is investigated. It is established, that due to processes of self-diffusion of active modifiers there is a distribution of their nanograins on the borders of miсroparticles of corundum powder. In addition, nanostructured modifiers fill a pore space that causes sliding of particles under mechanical and thermal loads of material and transfers the mechanism of fragile destruction to pseudo-plastic. The entered nanostructured modifiers promote the process of lamellar zones formation throughout the material that also strengthens its mechanical properties. The correlation of composite ceramics structure and their physico-mechanical characteristics are developed.

scholarly journals Structure, stress, and mechanical properties of Mo-Al-N thin films deposited by dc reactive magnetron cosputtering: Role of point defects

2020 ◽  
Vol 38 (5) ◽  
pp. 053401 ◽  
Author(s):  
Fırat Anğay ◽  
Lukas Löfler ◽  
Florent Tetard ◽  
Dominique Eyidi ◽  
Philippe Djemia ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Point Defects ◽  
Reactive Magnetron
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