Weldability - Behavior of Welded Reinforcement

2019 ◽  
Vol 70 (10) ◽  
pp. 3469-3472
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Mechanical Characteristics ◽  
Mechanical Performance ◽  
Current Work ◽  
Carbon Equivalent ◽  
Work Process ◽  
Ultimate Limit

Weldability involves two aspects: welding behavior of components and safety in operation. The two aspects will be reduced to the mechanical characteristics of the elements and to the chemical composition. In the case of steel reinforcing rebar’s, it is reduces to the percentage of Cech(carbon equivalent) and to the mechanical characteristics: the yielding limit, the ultimate limit, and the elongations which after that represent the ductility class in which the re-bars is framed. The paper will present some types of steel reinforcing rebar’s with its mechanical characteristics and the welding behavior of those elements. In the current work, process-related behavior of welded reinforcement, joint local and global mechanical properties, and their correlation with behavior of normal reinforcement and also the mechanical performance resulted in this type of joints. Keywords: welding behavior, ultimate limit, reinforcing rebar’s

scholarly journals Weldability - Behavior of Welded Reinforcement

2019 ◽  
Vol 70 (10) ◽  
pp. 3469-3472
Author(s):  
Anamaria Feier ◽  
Oana Roxana Chivu ◽  
Augustin Stoica
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Mechanical Characteristics ◽  
Mechanical Performance ◽  
Current Work ◽  
Carbon Equivalent ◽  
Work Process ◽  
Ultimate Limit

Weldability involves two aspects: welding behavior of components and safety in operation. The two aspects will be reduced to the mechanical characteristics of the elements and to the chemical composition. In the case of steel reinforcing rebar�s, it is reduces to the percentage of Cech(carbon equivalent) and to the mechanical characteristics: the yielding limit, the ultimate limit, and the elongations which after that represent the ductility class in which the re-bars is framed. The paper will present some types of steel reinforcing rebar�s with its mechanical characteristics and the welding behavior of those elements. In the current work, process-related behavior of welded reinforcement, joint local and global mechanical properties, and their correlation with behavior of normal reinforcement and also the mechanical performance resulted in this type of joints.

scholarly journals Factors That Affect the Mechanical Strength of Archaeological Wood—A Case Study of 18th-Century Wooden Water Pipes from Bóżnicza Street in Poznań, Poland

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7632
Author(s):  
Magdalena Broda ◽  
Carmen-Mihaela Popescu ◽  
Daniel Ilie Timpu ◽  
Dawid Rowiński ◽  
Edward Roszyk
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Mechanical Strength ◽  
Wood Density ◽  
Mechanical Performance ◽  
Cellulose Crystallinity ◽  
Compression Tests ◽  
Substantial Impact ◽  
Archaeological Wood

Large amounts of archaeological wood are often excavated during groundworks in cities and towns. Part of the unearthed artefacts is usually saved, conserved and then presented in museums. However, if the finding contains several similar objects, some of them could potentially be further employed for some other practical purposes. The research aimed to determine the mechanical performance of the remains of wooden water mains excavated at Bóżnicza street in Poznań, Poland and evaluate its potential usefulness for any practical purposes. First, wood density was determined along with its mechanical strength in compression. The density of archaeological wood identified as Scots pine was lower than contemporary pinewood (383 kg × m−3 vs. 572 kg × m−3); therefore, its mechanical properties in compression tests were also lower, as expected, making the wood unsuitable for any practical applications. However, the differences in modulus of elasticity and compressive strength were not justified by the differences in wood density. Further infrared spectroscopy and X-ray diffraction analyses revealed additional differences in chemical composition and cellulose crystallinity between archaeological and contemporary wood. The results indicated the decrease in carbohydrate content and cellulose crystallinity in degraded wood, which, in addition to wood density, apparently contribute to the deterioration in mechanical strength of archaeological wood. The case study of the excavated archaeological wooden pipes shows that they have historical value but are not useful for practical purposes. It also revealed that not only wood density but also its chemical composition and cellulose crystallinity level has a substantial impact on the wood mechanical properties, particularly in compression.

STUDY OF HIGH-STRENGTH LOW-ALLOY STEEL WITH SUPER-EQUILIBRIUM NITROGEN CONTENT

2020 ◽  
pp. 3-13
Author(s):  
S.A. Krylov ◽  
◽  
A.A. Makarov ◽  
M.A. Druzhnov ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Nitrogen Content ◽  
Mechanical Characteristics ◽  
High Strength ◽  
Low Alloy Steels ◽  
Low Alloy Steel ◽  
Joint Work ◽  
Alloy Steels ◽  
High Level

In continuation of joint work of FSUE «VIAM» and IMET RAN named after Baikov, in the field of obtaining low-alloy steels with increased mechanical properties with a super-equilibrium nitrogen content, the mechanical properties, structure, and chemical composition of the obtained steel were studied. It is shown that steel 10KH3A with a super-equilibrium nitrogen content (up to 0,2) electroslag remelting under pressure DESHP-0,1 (FSUE «VIAM») provides a high level of properties (ultimate strength 1670 MPa) while maintaining high mechanical characteristics (elongation 10%, constriction 50%).

Sulfur-Containing Composite Material for the Concrete Production

2016 ◽  
Vol 712 ◽  
pp. 171-175 ◽  
Author(s):  
Irina Frolova ◽  
Viktor V. Tikhonov ◽  
Anna P. Poltoranina ◽  
Natalya Usoltseva ◽  
Shuang Cheng Fu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Composite Material ◽  
Fly Ash ◽  
Chemical Composition ◽  
Power Plant ◽  
Mechanical Characteristics ◽  
Combined Heat And Power ◽  
Concrete Production ◽  
Sulfur Containing

The chemical composition and particle size distribution as well as the physical-mechanical characteristics of fly ash of Krasnokamensk combined heat and power plant (CHPP) were determined. The revealed features provided the development of the technology of fly ash enrichment. The composite building material based on both fly ash of Krasnokamensk CHPP and technical sulfur was developed. Aluminum chloride was proposed to be used as modifier. The basic physical-mechanical properties of sulfur crushed stone were investigated.

scholarly journals Mechanical Properties Evaluation of Functionally Layered Cement Composites

2020 ◽  
Vol 14 (1) ◽  
pp. 1-9
Author(s):  
Ali Bagheri ◽  
Jay Sanjayan ◽  
Jeeva S. Ali ◽  
Jatin Arora ◽  
Karamjit Sing
Keyword(s):  
Mechanical Properties ◽  
Performance Index ◽  
Mechanical Characteristics ◽  
Steel Fibre ◽  
Mechanical Performance ◽  
Layered Composite ◽  
Polypropylene Fibre ◽  
Cement Composites ◽  
Concrete Mixtures ◽  
Alternative Approach

Background: Concrete mixtures are normally poured in single layers without intentional changes in the mixture properties within the thickness of the layers. Objective: In this research paper, alternative approach is introduced with Functionally Layered Concrete (FLC) composites, which have their known functions to achieve the maximum performance index. Methods: The performance index can be defined as the ratio of characteristics to the consumption of resources, fibres and additives. The steel fibre, polypropylene fibre, and silica fume are used in cement composites to make multilayer samples on which mechanical properties evaluations are conducted and compared to that of Mono-Layered Concrete (MLC) samples. Results: It is observed from the results that FLC samples have superior mechanical characteristics compared to MLC samples in terms of compressive strength, flexural strength and elastic modulus. Conclusion: Given that the use of fibres/additives in FLC composites is diminished, acquiring better mechanical performance with minimised consumption of resources would be possible via functionally layered composite method.

scholarly journals Mechanical properties of composite material laminates reinforced by woven and non-woven glass fibers

2020 ◽  
Vol 175 ◽  
pp. 12005 ◽  
Author(s):  
Amer Karnoub ◽  
Hajian Huang ◽  
Imad Antypas
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Glass Fiber ◽  
Mechanical Characteristics ◽  
Polyester Resin ◽  
Mechanical Performance ◽  
Glass Fibers ◽  
Mechanical Tests ◽  
Impact Behavior ◽  
The Impact

The purpose of this work is to study the mechanical characteristics in 3-point bending and in traction; static; and the impact behavior of three specimens of laminates made of glass fiber and polyester resin non-woven and woven, with the aim of using them in the repair of boat hulls and enhancing their value in the naval industry. Three types of laminates were developed by contact molding. These different specimens of laminates made of woven, non-woven and combined glass fiber (woven and non-woven) were subjected to mechanical tests (traction and 3-point bending). Analysis of the results of the tests carried out on these three types of laminate shows that one specimen stands out and gives higher mechanical performance than the othertwo.

Mechanical Characteristics Alteration of a Steel Used in Water Turbine Blades

2016 ◽  
Vol 254 ◽  
pp. 194-199
Author(s):  
Răzvan Coman ◽  
Robert Ciocoiu ◽  
Alin Dinita ◽  
Ion Ciucă
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Turbine Blade ◽  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Mechanical Characteristics ◽  
Turbine Blades ◽  
Optical Emission ◽  
Blade Surface ◽  
Water Turbine

A water turbine blade was investigated after it was discarded. First general macroscopic observations were performed on the turbine blade surface and then chemical composition of the steel was determined by arc spark optical emission spectroscopy. The study aimed to observe if the mechanical properties of the steel changed by a significant amount when compared with literature data. Tensile and impact tests were performed. The samples were obtained from transverse sections from the blade.

Influence of the Addition of Mg, Maturation and Casting Techniques on the Evolution of Elastic, Plastic and Structural Properties of 44100 Polycrystalline Alloy

2013 ◽  
Vol 698 ◽  
pp. 49-58
Author(s):  
Ahmed Hakem ◽  
Youcef Bouafia ◽  
Ali Bilek
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Structural Properties ◽  
Mechanical Characteristics ◽  
Tensile Behavior ◽  
Metal Shell ◽  
Large Yield ◽  
Polycrystalline Alloy ◽  
Sand Molding ◽  
Structural Hardening

The addition of a high percentage of silicon and a small percentage of magnesium to aluminum are the main enhancers largely used to improve the mechanical characteristics. Our goal, here, is to make a direct contribution to the mechanical properties in traction, the hardness, the resilience and the structural properties of the AlSi13 alloy used in sand molding and shell metal molding, mechanical as well as manual. The reference state is designated by crude casting, noted: F. To increase the characteristics and obtain substantially large yield stresses and higher stiffnesses, the material of numerical designation 44100 is subjected to the specific heat treatments, quenching and annealing. This study aims to determine the influence of the chemical composition, the structural hardening of sand casting and metal shell casting by gravity on the evolution of the tensile behavior, hardness, resilience and microstructure of the binary alloy 44100.

scholarly journals Forecast of mechanical properties of metal products

2021 ◽  
pp. 30-40
Author(s):  
S.V. Ivantsov ◽  
I.A. Tiutieriev ◽  
Yu.S. Slupska ◽  
R.R. Sinchuk
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Chemical Composition ◽  
Mechanical Characteristics ◽  
Bending Strength ◽  
Cast Irons ◽  
Rolling Mills ◽  
Dimensional Dependence ◽  
Composition And Structure ◽  
Composition Materials

Introduction. The mechanical properties of the metal depend primarily on their chemical composition and structure. The structure of metal materials is formed under the influence of different temperature modes of manufacture and cooling. Models for predicting the mechanical properties of steels and cast irons are based on the influence of chemical composition and structure. The paper considers an approach that allows to evaluate the mechanical properties of rolling (C) cast iron rolls with a pearlitic (P) matrix depending on the complex influence of the elements of their chemical composition. Materials and methods. The working area of СПХН roll cast iron samples from the surface up to 50 mm doped with chromium (X) and nickel (H) was investigated. The carbide content varied from 10 to 15 %; and lamellar graphite did not exceed 2 %. The results of the experiment. In the work for modeling the mechanical characteristics of cast iron rolls used the method of planning experiments. The choice of this technique is due to the multi-parameter technology of production of solid metal casting. The application of this technique allowed to obtain models for predicting the mechanical characteristics of roll cast iron SPHN depending on the influence of the elements of the chemical composition of the rolls (C, Si, Mn, P, S, Cr, Ni). The error in predicting the tensile strength sВ, bending strength sзгин bending and hardness according to the Shore HSD method did not exceed 5,89 %. When checking the models for convergence of results by Fisher's criterion at a critical value of Fcrit = 2,400 for sВ, this coefficient was 1,249; for sзгин fold was 1,289 and for HSD - 1,012. To analyze the effect of carbon on mechanical characteristics, two-dimensional dependence plots are constructed. Conclusions. Within the operating values of the parameters of the chemical composition of cast iron rolling mills СПХН-45 in accordance with existing regulations, a forecast of their mechanical characteristics within the allowable limits of error of experimental data. The results of the work allow to obtain mathematical models in the process of production of rolls of the СПХН brand to quickly establish their chemical composition within the standard technology in accordance with the customer's requirements for these mechanical characteristics. In addition, the obtained models can predict these characteristics of the manufactured rolls with minimal material and time costs. Keywords: rolling mills; elements of chemical composition; mechanical characteristics; multiparameter technology

Study of the character and causes of destruction of the cardan shaft of the propeller engine

2019 ◽  
Vol 85 (12) ◽  
pp. 43-50
Author(s):  
D. A. Movenko ◽  
L. V. Morozova ◽  
S. V. Shurtakov
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Yield Point ◽  
Protective Coating ◽  
Fracture Pattern ◽  
Corrosion Cracking ◽  
Tempered Martensite ◽  
Neck Formation ◽  
Static Mechanism ◽  
Shaft Surface

The results of studying operational destruction of a high-loaded cardan shaft of the propeller engine made of steel 38KhN3MFA are presented to elucidate the cause of damage and develop a set of recommendations and measures aimed at elimination of adverse factors. Methods of scanning electron and optical microscopy, as well as X-ray spectral microanalysis are used to determine the mechanical properties, chemical composition, microstructure, and fracture pattern of cardan shaft fragments. It is shown that the mechanical properties and chemical composition of the material correspond to the requirements of the regulatory documentation, defects of metallurgical origin both in the shaft metal and in the fractures are absent. The microstructure of the studied shaft fragments is tempered martensite. Fractographic analysis revealed that the destruction of cardan shaft occurred by a static mechanism. The fracture surface is coated with corrosion products. The revealed cracks developed by the mechanism of corrosion cracking due to violation of the protective coating on the shaft. The results of the study showed that the destruction of the cardan shaft of a propeller engine made of steel 38Kh3MFA occurred due to formation and development of spiral cracks by the mechanism of stress corrosion cracking under loads below the yield point of steel. The reason for «neck» formation upon destruction of the shaft fragment is attributed to the yield point of steel attained during operation. Regular preventive inspections are recommended to assess the safety of the protective coating on the shaft surface to exclude formation and development of corrosion cracks.

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