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Journal articles on the topic 'Work hardening coefficients'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Koneva, Nina, and Eduard Kozlov. "Stages of Plastic Deformation in Metallic Nanocrystals." Materials Science Forum 683 (May 2011): 183–87. http://dx.doi.org/10.4028/www.scientific.net/msf.683.183.

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In this paper, analysis of work hardening laws for grains with sizes on nano- and microlevel is carried out. The work is based on experimental data of deformation behavior of mainly pure copper at room temperature (RT). A special attention is given to the interval of grains with the average size between 20 nm and 230 nm. Work hardening stages of active plastic deformation during tension and compression are characterized. The dependence of work hardening coefficients on the average grains size at the nanoscale in the II, IV and VI stages is revealed for the first time. Mechanisms of deformation

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2

Rajendran, R., M. Venkateshwarlu, Vijay Petley, and Shweta Verma. "Strain hardening exponents and strength coefficients for aeroengine isotropic metallic materials – a reverse engineering approach." Journal of the Mechanical Behavior of Materials 23, no. 3-4 (2014): 101–6. http://dx.doi.org/10.1515/jmbm-2014-0012.

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AbstractThe strain hardening exponent and strength coefficient of the Ramberg-Osgood flow rule are required for the accurate design analysis of the materials of aeroengine components. A direct method of deriving these parameters involves the processing of the complete raw data of tensile testing as per ASTM E-646. More often, a first design effort of aeroengine components is made using catalogue data, as the evaluation of material tensile properties is a time-consuming process that takes place concurrently. Catalogue-supplied data on the monotonic loading typically contains elastic modulus, 0.

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3

Lee, Bo Young, Dae Hwan An, Jae Sung Kim, Hyung Kook Jin, and Duck Hee Ryu. "Study on Development of a Surface Build-Up Welding Using CH-90 Electrode to Replace Mn-Containing Rail Steel." Advanced Materials Research 15-17 (February 2006): 989–94. http://dx.doi.org/10.4028/www.scientific.net/amr.15-17.989.

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Rail steel at crossing areas bears much higher loads over any other section of a regular railway. Mn-containing casting steel is normally used for its high load-carrying capability and reduced wear rate. However, since Mn-containing casting steel tends to have casting defects, the cost of manufacturing defect-free Mn-containing casting steel becomes quite expensive. Therefore, through the use of welding, this study investigates the possibility of resurfacing Mn-containing rail steel using a CH-90 electrode as an alternative to completely replacing it. In this study, a series of experimental bu

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4

STRZELCZAK, Katarzyna, and Agata DUDEK. "THE STRUCTURE AND COEFFICIENT OF FRICTION OF WELDED NICKEL ALLOYS INCONEL 625 AND INCONEL 718." Tribologia 281, no. 5 (2018): 109–15. http://dx.doi.org/10.5604/01.3001.0012.7660.

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In this study, the coefficients of friction for three series of welded nickel alloy joints, subjected to different heat treatments (lack of heat treatment, solution heat treatment, precipitation hardening), were determined. Heat treatment of the prepared samples was aimed at eliminating the structural and stress gradient, because the electron beam welding technique is dedicated for constructions with very high quality and strength requirements. Given the nature of the electron beam process, the authors are aware that the obtained weld’s structures are characterized by different properties from

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Grilo, Tiago Jordão, Robertt Angelo Fontes Valente, and R. J. Alves de Sousa. "On the Study of Distinct Algorithmic Strategies in the Implementation of Advanced Anisotropic Models with Mixed Hardening." Key Engineering Materials 554-557 (June 2013): 1174–83. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1174.

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In this study, suitable distinct stress integration algorithms for advanced anisotropic models with mixed hardening, and their implementation in finite element codes, are discussed. The constitutive model studied in the present work accounts for advanced (non-quadratic) anisotropic yield criteria, namely, the Barlat et al. 2004 model with 18 coefficients (Yld2004-18p), combined with a mixed isotropic-nonlinear kinematic hardening law. This phenomenological model allows for an accurate description of complex plastic yielding anisotropy and Bauschinger effects, which are essential for a reliable

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Pacheco, Matías, Claudio García-Herrera, Diego Celentano, and Jean-Philippe Ponthot. "Mechanical Characterization of the Elastoplastic Response of a C11000-H2 Copper Sheet." Materials 13, no. 22 (2020): 5193. http://dx.doi.org/10.3390/ma13225193.

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This work presents an elastoplastic characterization of a rolled C11000-H2 99.90% pure copper sheet considering the orthotropic non-associated Hill-48 criterion together with a modified Voce hardening law. One of the main features of this material is the necking formation at small strains levels causing the early development of non-homogeneous stress and strain patterns in the tested samples. Due to this fact, a robust inverse calibration approach, based on an experimental–analytical–numerical iterative predictor–corrector methodology, is proposed to obtain the constitutive material parameters

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Park, Taejoon, Fadi Abu-Farha, and Farhang Pourboghrat. "An Evolutionary Yield Function Model Based on Plastic Work and Non-Associated Flow Rule." Metals 9, no. 5 (2019): 611. http://dx.doi.org/10.3390/met9050611.

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A constitutive law was developed based on the evolutionary yield function to account for the evolution of anisotropy induced by the plastic deformation. For the effective description of anisotropy, the yield stress function and plastic potential were separately defined based on the non-associated flow rule. In particular, for the description of the equivalent status, the accumulated plastic work was employed as an alternative to the accumulated plastic strain. Numerical formulations based on the plastic work were also derived in case the hardening rule, as well as the evolution of the plastic

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8

Sawicki, Sylwester, Anna Kawałek, Konrad Laber, et al. "Plastometric Testing of Rheological Properties of 5083 and 5754 Aluminium Alloy." Key Engineering Materials 682 (February 2016): 362–66. http://dx.doi.org/10.4028/www.scientific.net/kem.682.362.

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The paper present a method for determining the real steel work-hardening curves based on the cylindrical specimen compression test. The subject of testing were 5083 and 5754 aluminium alloy. The tests were carried out using the physical simulator of metallurgical processes GLEEBLE 3800 (Figure 1a) for the temperature range of 400 ÷ 560 °C and the strain rate range of 0,1 - 1,0s-1. Based on plastic deformation parameters recorded during the experiment, mathematical processing, that is the digital filtration and approximation of the obtained testing results, will be performed. Then, using the in

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9

Tan, Ye Fa, Bin Cai, Long He, Sheng Qiang Hao, Hua Tan, and Li Gao. "Study on Tribological Behavior and Mechanisms of Weldox960 Steel." Advanced Materials Research 415-417 (December 2011): 2191–95. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.2191.

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Weldox960 steel is widely used in mechanical structure of military equipments as anti-wear parts. The tribological behavior and mechanisms of weldox960 steel were investigated under dry sliding friction conditions. The results show that friction coefficient of the steel increases from 0.268 to 0.365 with the increase of load. When the loads are smaller than 8N, the wear rates of the steel are in the range of 0.57~0.67×10-3 mm3/m, and the wear mechanism is multi-plastic deformation wear. If the loads are bigger than 10N, the wear rates increase to the range of 1.29~1.43×10-3 mm3/m, and the wear

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10

Goya, Moriaki, and Koichi Ito. "An Expression of Elastic-Plastic Constitutive Law Incorporating Vertex Formation and Kinematic Hardening." Journal of Applied Mechanics 58, no. 3 (1991): 617–22. http://dx.doi.org/10.1115/1.2897240.

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A phenomenological corner theory was proposed for elastic-plastic materials by the authors in the previous paper (Goya and Ito, 1980). The theory was developed by introducing two transition parameters, μ (α) and β (α), which, respectively, denote the normalized magnitude and direction angle of plastic strain increments, and both monotonously vary with the direction angle of stress increments. The purpose of this report is to incorporate the Bauschinger effect into the above theory. This is achieved by the introduction of Ziegler’s kinematic hardening rule. To demonstrate the validity and appli

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Katsman, A., Anton Gorny, D. Shepelev, and Menachem Bamberger. "Evolution of Precipitate Depleted Zones in Mg-Based Alloys Strengthened by Precipitation Hardening." Defect and Diffusion Forum 289-292 (April 2009): 153–59. http://dx.doi.org/10.4028/www.scientific.net/ddf.289-292.153.

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Extensive research work has been devoted to Mg-based alloys strengthened by precipitation hardening. Increasing the aging time leads to the appearance of zones depleted of precipitates near grain boundaries. The formation of precipitate depleted zones (PDZ's) is explained by near-grain boundary (NGB) coarsening. The evolution of PDZ's was considered on the basis of the model taking into account diffusional fluxes between adjacent precipitates. The set of equations was solved numerically by using a fourth-order Runge-Kutta method for different initial sizes of precipitates and densities of prec

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12

Klötzer, D., Ch Ullner, E. Tyulyukovskiy, and N. Huber. "Identification of viscoplastic material parameters from spherical indentation data: Part II. Experimental validation of the method." Journal of Materials Research 21, no. 3 (2006): 677–84. http://dx.doi.org/10.1557/jmr.2006.0077.

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A neural network-based analysis method for the identification of a viscoplasticity model from spherical indentation data, developed in the first part of this work [J. Mater. Res.21, 664 (2006)], was applied for different metallic materials. Besides the comparison of typical parameters like Young’s modulus and yield stress with values from tensile experiments, the uncertainties in the identified material parameters representing modulus, hardening behavior, and viscosity were investigated in relation to different sources. Variations in the indentation position, tip radius, force application rate

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13

Li, Wen Juan, Guo Qun Zhao, Xin Wu Ma, and Jun Gao. "Study on Warm and Hot Tensile Deformation Behavior and Flow Stress of AZ31B Magnesium Alloy Sheet." Advanced Materials Research 488-489 (March 2012): 51–56. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.51.

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The true stress-strain curves of AZ31B magnesium alloy sheet were obtained by using the uniaxial tensile tests at the temperature ranging from 50°Cto 300°C and the initial strain rate ranging from 0.001/s to 0.1/s. The influence of temperature and strain rate on the flow stress was analyzed. The results show that the flow stress decreases and the elongation in fracture increases with increasing temperature and decreasing strain rate，and the plastic performance is improved obviously. Through the analysis of the true stress-strain curves，a mathematical model of the flow stress was established ba

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Jia, Bin, Yan Peng, and Bo Ma. "Inverse Regression Analysis Method to Determine Mathematical Model of Dislocation Density Using Flow Stress Curves." Advanced Materials Research 129-131 (August 2010): 358–64. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.358.

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The flow stress curves of Q345B microalloyed steel during hot compression deformation were obtained at 900-1100°C and strain rates of 0.01-10s-1 on Gleeble-3500 thermo-mechanical simulator. Based on the experimental results, a inverse regression analysis method was proposed to determine the mathematical model of dislocation density and its correlation coefficients using the flow stress curves, so as to laid the foundations for calculating carbonitrides precipitates, deformation resistance and the end-rolled strength of microalloyed steels during hot rolling precisely. The effects of the deform

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15

Toh, C. H., Y. C. Shiau, and Shiro Kobayashi. "Analysis of a Test Method of Sheet Metal Formability Using the Finite-Element Method." Journal of Engineering for Industry 108, no. 1 (1986): 3–8. http://dx.doi.org/10.1115/1.3187039.

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The rigid-plastic finite element method was used to study the formability of sheet materials. In the finite element simulations, sheet material was assumed to be rigid plastic and to follow Hill’s anisotropic yield criterion and its associated flow rules. The work hardening effect and Coulomb friction were incorporated into the analysis. Hasek’s test, hemispherical punch stretching of the circular blank with circular cutoff, was analyzed in detail by simulation. The computed solutions were obtained using different blank geometries and coefficients of friction between the tool-sheet interface.

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Şener, Bora, and E. S. Kayali. "Effectiveness of Stamping Lubricants in Erichsen Test." Key Engineering Materials 549 (April 2013): 325–32. http://dx.doi.org/10.4028/www.scientific.net/kem.549.325.

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In the present work, formability of ultra low carbon steel sheets (uncoated interstitial free and galvanized steel sheet) has been characterized and the effectiveness of dry and liquid lubricants on formability of these steel sheets was evaluated by using the standard Erichsen test. Primarily, some important mechanical properties of materials like strain hardening coefficient (n), normal anisotropy (r) were determined using the tensile test and formability of these steel sheets has been correlated with these mechanical properties. Then these steel sheets were subjected to the Erichsen test usi

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17

Su, Dongxu, Rencheng Zheng, Kimihiko Nakano, and Matthew P. Cartmell. "Stabilisation of the high-energy orbit for a non-linear energy harvester with variable damping." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 12 (2015): 2003–12. http://dx.doi.org/10.1177/0954406215590169.

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The non-linearity of a hardening-type oscillator provides a wider bandwidth and a higher energy harvesting capability under harmonic excitations. Also, both low- and high-energy responses can coexist for the same parameter combinations at relatively high excitation levels. However, if the oscillator’s response happens to coincide with the low-energy orbit then the improved performance achieved by the non-linear oscillator over that of its linear counterpart, could be impaired. This is therefore the main motivation for stabilisation of the high-energy orbit. In the present work, a schematic har

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18

Vetrivel, S., R. U. Mullai, K. Kanagasabapathy, R. Aruljothi, and V. Praveenkumar. "Growth and Characterization of a Nonlinear Optical Single Crystal: Bis(4-nitrobenzoate) Tetraaquamanganese (II) Dihydrate (BNMD)." Journal of Advanced Physics 6, no. 1 (2017): 62–68. http://dx.doi.org/10.1166/jap.2017.1282.

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Semiorganic optically transparent Bis(4-nitrobenzoate) tetraaquamanganese (II) dihydrate [Mn (p-NO2C6H4COO)2 (H2O)4]·2H2O (BNMD) single crystals were grown by slow evaporation technique at room temperature. Single crystal X-ray diffraction analysis was carried out to determine the lattice parameters of the crystal. Powder X-ray diffraction pattern was recorded and indexed for the structural confirmation. The crystalline quality was confirmed by HRXRD. The presence of functional group in the compound has been confirmed by FTIR analysis. UV-Visible transmission spectrum has been recorded to dete

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19

Cochennec, Florent, Emmanuelle Rouhaud, Delphine Retraint, Sébastien Rouquette, and Arjen Roos. "Analysis of the Impact of a Shot at Low Velocity Using the Finite Element Method. Application to the Ultrasonic Shot-Peening Process." Materials Science Forum 524-525 (September 2006): 337–42. http://dx.doi.org/10.4028/www.scientific.net/msf.524-525.337.

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Shot-peening is a surface treatment widely used in the industry to improve fatigue life of mechanical components by introducing compressive residual stresses. Ultrasonic shot-peening is a recent development of this process. While the classical shot-peening process uses pneumatic energy to project the shots, ultrasonic peening uses high-power ultrasounds. This energy source allows the use of larger shots projected at lower velocity as compared to classical shot-peening. This work aims at studying the mechanical response (restitution coefficient, residual stress field) of a surface impacted by a

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20

Nabarro, F. R. N. "The coefficient of work hardening in stage IV." Scripta Metallurgica et Materialia 30, no. 8 (1994): 1085–87. http://dx.doi.org/10.1016/0956-716x(94)90560-6.

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21

Chartrel, Benjamin, and Elisabeth Massoni. "Deep Drawing of Ti6Al4V: Experiments and Modeling over a Wide Range of Strain Rates and Temperatures." Key Engineering Materials 554-557 (June 2013): 190–94. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.190.

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A combined experimental-numerical approach using digital image correlation (DIC) and finite element simulation in order to get the temperature dependent mechanical behaviour is presented. Results from a series of experiments on a Ti6Al4V titanium alloy sheet are shown. Tensile tests were carried out on specimens along 3 different orientations in order to characterise the material anisotropy. The strain-rates are varied from 10-1 to 10-2 s-1 while observations are made at temperatures from 903 to 1003 K. The samples are heated by Joule effect, which allows to use the image correlation in order

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22

Alister, Celentano, Signorelli, Bouchard, Pino, and Cruchaga. "Characterization of the Elastoplastic Response of Low Zn-Cu-Ti Alloy Sheets Using the CPB-06 Criterion." Materials 12, no. 19 (2019): 3072. http://dx.doi.org/10.3390/ma12193072.

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Unlike other HCP metals such as titanium and magnesium, the behavior of zinc alloys has only been modeled in the literature. For the low Zn-Cu-Ti alloy sheet studied in this work, the anisotropy is clearly seen on the stress-strain curves and Lankford coefficients. These features impose a rigorous characterization and an adequate selection of the constitutive model to obtain an accurate representation of the material behavior in metal forming simulations. To describe the elastoplastic behavior of the alloy, this paper focuses on the material characterization through the application of the adva

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Liu, Rong Chang, Li Dong Chen, Yu Wu, Shu Ying Ma, and Li Zhen Feng. "Description of Work-Hardening Layer’s Depth by Soft Coefficient." Key Engineering Materials 419-420 (October 2009): 73–76. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.73.

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In this paper, by introducing the conceptions of stress condition and soft coefficient, a nonlinear equation is used to describe stress condition of the contacting body along depth. By taking the classical contact problem of two parallel cylinders as an example, we give a quantitative description of work-hardening layer’s depth related to local contact problems by using soft coefficient, and it is theoretically proved that plastic deformation and plastic failure exist objectively in engineering contact problem. The analysis indicates that hardening layer’s depth in the range of 0.43643b(where

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Mikulowski, B., and B. Wielke. "“Anomaly” of work-hardening coefficient in zinc single crystals." Czechoslovak Journal of Physics 35, no. 3 (1985): 286–91. http://dx.doi.org/10.1007/bf01605097.

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Kittner, Kristina, Madlen Ullmann, Thorsten Henseler, Rudolf Kawalla, and Ulrich Prahl. "Microstructure and Hot Deformation Behavior of Twin Roll Cast Mg-2Zn-1Al-0.3Ca Alloy." Materials 12, no. 7 (2019): 1020. http://dx.doi.org/10.3390/ma12071020.

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In the present work, the microstructure, texture, mechanical properties as well as hot deformation behavior of a Mg-2Zn-1Al-0.3Ca sheet manufactured by twin roll casting were investigated. The twin roll cast state reveals a dendritic microstructure with intermetallic compounds predominantly located in the interdendritic areas. The twin roll cast samples were annealed at 420 °C for 2 h followed by plane strain compression tests in order to study the hardening and softening behavior. Annealing treatment leads to the formation of a grain structure, consisting of equiaxed grains with an average di

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Abdelali, Hanane Moulay, Mounia El Kadiri, and Rhali Benamar. "A Semi-Analytical Approach for the Geometrically Nonlinear Analysis of Skew Plates." Applied Mechanics and Materials 704 (December 2014): 118–30. http://dx.doi.org/10.4028/www.scientific.net/amm.704.118.

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The present work concerns the nonlinear dynamic behaviour of fully clamped skew plates at large vibration amplitudes. A model based on Hamilton’s principle and spectral analysis has been used to study the large amplitude free vibration problem, reducing the non linear problem to solution of a set of non-linear algebraic equations. Two methods of solution have been adopted, the first method uses an improved version of the Newton-Raphson method, and the second leads to explicit analytical expressions for the higher mode contribution coefficients to the first non-linear mode shape of the skew pla

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Higuera-Cobos, Oscar Fabián, Carlos Mauricio Moreno-Téllez, and Cristian Antonio Pedraza-Yepes. "Effect of Thermal Cycling on Abrasive Wear Response of Cu-1.9Be-0.25(Co+Ni) Alloy." Revista Facultad de Ingeniería 29, no. 54 (2020): e11616. http://dx.doi.org/10.19053/01211129.v29.n54.2020.11616.

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Cu-Be alloys are considered high strength alloys when containing 0.2% to 2% of Be per weight, 0.2% to 2.7% of Co per weight, and up to 2.2% of Ni per weight, since they can present an elastic limit higher than 1380 MPa after aging (precipitation hardening), while, without heat treatment, they present an elastic limit between 205 MPa and 690 MPa [1]. Therefore, the complexity of the microstructure is a determining factor in the mechanical behavior of this type of alloys. In this work we analyzed the effect of microstructural variations obtained by cooling with water and with air from three diff

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Oliveira, Marta C., J. Luís Alves, and Luís Filipe Menezes. "Evolutional Friction Law in the Numerical Simulation of the Deep Drawing of a Rail." Materials Science Forum 514-516 (May 2006): 1443–47. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.1443.

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One of the most relevant technological parameters for the accurate numerical simulation of the deep drawing process is friction, since the contact between the blank sheet and tools develops friction forces that act as supplementary boundary conditions that determine the final part shape. Most applications reported in literature are still restricted to Coulomb’s law with a constant friction coefficient over the entire process. Although it is consensual that state conditions of contact surfaces and consequently the friction behaviour are influenced by a large number of parameters, there is no ag

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Nagaraja, Santhosh, Ramesha Kodanda, Khalid Ansari, et al. "Influence of Heat Treatment and Reinforcements on Tensile Characteristics of Aluminium AA 5083/Silicon Carbide/Fly Ash Composites." Materials 14, no. 18 (2021): 5261. http://dx.doi.org/10.3390/ma14185261.

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The effect of reinforcements and thermal exposure on the tensile properties of aluminium AA 5083–silicon carbide (SiC)–fly ash composites were studied in the present work. The specimens were fabricated with varying wt.% of fly ash and silicon carbide and subjected to T6 thermal cycle conditions to enhance the properties through “precipitation hardening”. The analyses of the microstructure and the elemental distribution were carried out using scanning electron microscopic (SEM) images and energy dispersive spectroscopy (EDS). The composite specimens thus subjected to thermal treatment exhibit u

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Zaides, S. A., and Kuang Le Khong. "Straightening of low-rigid cylindrical details. Part I. Justification of the type of loading and modes at transverse straightening." Izvestiya. Ferrous Metallurgy 62, no. 7 (2019): 517–24. http://dx.doi.org/10.17073/0368-0797-2019-7-517-524.

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For straightening of low-rigid cylindrical details like shaft and axes different types of loadings are considered which form tension different in size and in distribution. As the perspective direction, it is possible to consider correction by a bend at the influence of the distributed loading with the subsequent hardening of a billet by superficial plastic deformation based on a cross cheesing of it by flat plates. Purpose of the work was to define tension of the billet at cross correction for the choice of more effective type of loading and processing rational modes. The mathematical apparatu

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Udod, O. A., and Kh I. Bekuzarova. "LABORATORY STUDY OF POLYMERIZATION DEPTH OF COMPOSITE MATERIALS." Ukrainian Dental Almanac, no. 1 (March 21, 2018): 14–16. http://dx.doi.org/10.31718/2409-0255.1.2018.03.

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With the advent of modern improved restorative materials, the process of teeth restoration has become even more complex, but it provides an impeccable anatomical, functional and aesthetic result. In the new generation of composites there is a number of advantages, namely, increased mechanical strength, increased abrasion resistance, hardness, colour stability. All these allows restoring the anatomical shape of teeth and functional characteristics even with a significant degree of damage. However, after restoration, complications are often associated with polymerization of stress and shrinkage

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Butt, Muhammad Zakria, and Syed Mohsin Raza. "Anomalies in flow stress and work-hardening coefficient of polycrystalline metals at low temperatures." Journal of Materials Science Letters 6, no. 1 (1987): 54–56. http://dx.doi.org/10.1007/bf01729427.

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Farahat, Ahmed I. Z., Zainab Abdel-hamid, and Nasser Gomaa. "Effect of Manganese Sulphide Shapes on the Work-hardening Coefficient of Hot Rolled Structural Steel." Journal of Metallurgical Engineering 4 (2015): 18. http://dx.doi.org/10.14355/me.2015.04.003.

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Bressan, José Divo, Luciano Pessanha Moreira, Maria Carolina dos Santos Freitas, Stefania Bruschi, Andrea Ghiotti, and Francesco Michieletto. "Modelling of Forming Limit Strains of AA5083 Aluminium Sheets at Room and High Temperatures." Advanced Materials Research 1135 (January 2016): 202–17. http://dx.doi.org/10.4028/www.scientific.net/amr.1135.202.

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Present work analyses mathematical modelling to predict the onset of localized necking and rupture by shear in industrial processes of sheet metal forming of aluminium alloy 5083 such as biaxial stretching and deep drawing. Whereas the AA5083 sheet formability at room temperature is moderate, it increases significantly at high temperature. The Forming Limit Curve, FLC, which is an essential material parameter necessary to numerical simulations by FEM, of AA 5083 sheet was assessed experimentally by tensile and Nakajima testing performed at room and 400°C temperatures. Tensile test specimens at

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Belomyttsev, M. Yu. "Mathematical modeling of strength characteristics of chromium ferritic-martensitic steels." Izvestiya. Ferrous Metallurgy 63, no. 6 (2020): 458–68. http://dx.doi.org/10.17073/0368-0797-2020-6-458-468.

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To predict the chemical composition of heat-resistant high-chromium steels with ferritic-martensitic structure (HFMS) (with the number of alloying elements up to 10 and the same number of parameters of production and heat treatment technology), a mathematical model is needed. In this work, I searched for the dependences of the yield strength and ultimate strength of HFMS on the content of alloying elements and test temperature without analyzing technological factors due to their uniformity. Analysis of the samples from ten steel grades was carried out on the basis of the experimental data incl

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Kossov, V. S., G. M. Volokhov, O. G. Krasnov, M. N. Ovechnikov, A. L. Protopopov, and V. V. Oguenko. "Influence of the axial loads of rolling stock on the contact-fatigue life of rails." Vestnik of the Railway Research Institute 77, no. 3 (2018): 149–56. http://dx.doi.org/10.21780/2223-9731-2018-77-3-149-156.

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Analysis of operational data for defective and highly defective rails showed that up to 25 % is the contact-fatigue defects. In connection with the development of heavy haul traffic on the Russian railways, it is relevant to determine the influence of cars with increased axial loads of 25 and 27 tf on the contact fatigue life of rails. The solution of this problem is set forth in this article. The Brown-Miller model of multi-axial fatigue was used in the calculation. This model is integrated into the Fatigue software system, which is tied to the Marc calculation system through Pat-ran. Since u

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Dominguez, David, and Igor Sevostianov. "Cross-Property Connection between Work-Hardening Coefficient and Electrical Resistivity of Stainless Steel During Plastic Deformation." International Journal of Fracture 167, no. 2 (2010): 281–87. http://dx.doi.org/10.1007/s10704-010-9556-8.

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Xu, Y., L. C. Chan, Y. C. Tsien, L. Gao, and P. F. Zheng. "Prediction of work-hardening coefficient and exponential by adaptive inverse finite element method for tubular material." Journal of Materials Processing Technology 201, no. 1-3 (2008): 413–18. http://dx.doi.org/10.1016/j.jmatprotec.2007.11.269.

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Badawi, Emad A., M. A. Abdel-Rahman, and Alaa El-Deen A. El-Nahhas. "Correlation Coefficient between Vickers Hardness and Nuclear Technique." Defect and Diffusion Forum 344 (October 2013): 129–36. http://dx.doi.org/10.4028/www.scientific.net/ddf.344.129.

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The aim of this work is to establish a correlation coefficient between the positron annihilation lifetime technique (PALS) and the Vickers hardness for the heat treatable aluminum alloys (6066, 6063).The potential of positron annihilation spectroscopy in the study of light alloys is illustrated with special regards to age hardening, severe plastic deformation, annealing and quenching in aluminum alloys. Vickers hardness is the standard method for measuring the hardness of metals, particularly those with extremely hard surfaces. Accordingly, a correlation coefficient of 90 % between τ and Hv is

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Bert, C. W., and S. Huang. "On the Thermal Expansion Coefficient and Specific Heat at Constant Strain for Finite Plastic Deformation." Journal of Applied Mechanics 60, no. 2 (1993): 449–55. http://dx.doi.org/10.1115/1.2900814.

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General expressions for thermal expansion coefficient and specific heat at constant strain in the case of finite plastic deformation are derived from a general analysis of thermodynamics and finite plasticity theory. The present results show that these two thermal parameters are dependent, in a very complicated way, on the mechanical behavior of the material, such as the plastic yielding and flow, work-hardening and stress-strain relation. They are not constants but vary with the stress state, deformation state, and deformation history. It is shown that previously published experimental observ

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Jain, Ayush, Abhishek Singh, and Arendra Pal Singh. "Effect of tribological parameters on sliding wear and friction coefficient which relates to preload loss in tapered roller bearing." Industrial Lubrication and Tribology 71, no. 1 (2019): 61–73. http://dx.doi.org/10.1108/ilt-01-2017-0019.

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Purpose This paper aims to study the sliding wear and coefficient of friction (COF) using “ball on disc” tribometer. Discs of bearing steel were subjected to different tribological parameters such as heat treatment (through hardening and case hardening), sliding speed, sliding distance and micro-geometry of the functional ball and disc point contact. Results obtained from tribometer were correlated with the preload loss in tapered roller bearing. Preload loss is subjected to wear rate pattern with respect to the internal geometry and micro-geometry of functional surfaces of the tapered roller

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Sarı, Gözde, and Mehmet Pakdemirli. "Vibrations of a Slightly Curved Microbeam Resting on an Elastic Foundation with Nonideal Boundary Conditions." Mathematical Problems in Engineering 2013 (2013): 1–16. http://dx.doi.org/10.1155/2013/736148.

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An investigation into the dynamic behavior of a slightly curved resonant microbeam having nonideal boundary conditions is presented. The model accounts for midplane stretching, an applied axial load, and a small AC harmonic force. The ends of the curved microbeam are on immovable simple supports and the microbeam is resting on a nonlinear elastic foundation. The forced vibration response of curved microbeam due to the small AC load is obtained analytically by means of direct application of the method of multiple scales (a perturbation method). The effects of the nonlinear elastic foundation as

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Moller, A. B., D. I. Kinzin, and S. A. Levandovskiy. "Improving the Rolling Technology at Mill 450 OJSC "MMK" to Reduce the Level of Alloying of 09G2S Steel Designed for Strength Class up to 440 MPa." Solid State Phenomena 265 (September 2017): 1123–29. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.1123.

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Nowadays, the technology of shape-rolled steel production defines the quality and strength of common purpose and critical building structures. To provide for all the necessary mechanical characteristics, it is necessary to pay attention to each phase of steel production: melting, casting, reheating, rolling and cooling. Often, due to poor production equipment and lack of appropriate technologies steel alloying is applied. This deteriorates steel weldability and significantly increases the cost of the rolled product. The article reviews the final stage properties formation – water quenching sta

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Matterstock, B., J. L. Martin, J. Bonneville, and T. Kruml. "Direct Measurement of Dislocation Exhaustion Rates During Plastic Deformation of Ni3Al Compounds." MRS Proceedings 552 (1998). http://dx.doi.org/10.1557/proc-552-kk5.17.1.

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ABSTRACTTwo methods of repeated transients (stress relaxation and creep) which can be performed during straining at a constant strain rate are recalled together with the way the results are interpreted. The repeated creep method has been adapted to Ni3A1 compounds for which the amount of creep strain during the second creep could not be detected so far. Because of a small stress increase between creeps, it is possible to measure microscopic activation volumes, dislocation exhaustion rates and strain hardening coefficients. Results in Ni3A1 polycrystals and Ni3(AI,Hf) single crystals are presen

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Andrés, Luis San. "Rotordynamic Force Coefficients of Bubbly Mixture Annular Pressure Seals." Journal of Engineering for Gas Turbines and Power 134, no. 2 (2011). http://dx.doi.org/10.1115/1.4004130.

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As oil fields deplete, in particular in deep sea reservoirs, pump and compression systems work under more strenuous conditions with gas in liquid and liquid in gas mixtures, mostly inhomogeneous. Off-design operation affects system overall efficiency and reliability, including penalties in leakage and rotordynamic performance of secondary flow components, namely seals. The paper details a bulk-flow model for annular damper seals operating with gas in liquid mixtures. The analysis encompasses all-liquid and all-gas seals, as well as seals lubricated with homogenous (bubbly) mixtures, and predic

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Alankar, Alankar, Ioannis N. Mastorakos, David P. Field, and Hussein M. Zbib. "Determination of Dislocation Interaction Strengths Using Discrete Dislocation Dynamics of Curved Dislocations." Journal of Engineering Materials and Technology 134, no. 2 (2012). http://dx.doi.org/10.1115/1.4005917.

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In latent interactions of dislocations, junction formation is one of the most important phenomena that contribute to the evolution of strength. In this work, the latent hardening coefficients for pure aluminum are estimated using 3D multiscale dislocation dynamics program (MDDP). Three well-known junction configurations, namely, the Hirth lock, the glissile junction, and the Lomer lock, are studied using 3D discrete dislocation dynamics simulations. The evolution of strength is discussed as a function of the resolved shear stress (RSS) and the number of junctions for the three junctions invest

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Jeuthe, Julius, José Carlos González Sánchez, Maria Magnusson, Michael Sandborg, Åsa Carlsson Tedgren, and Alexandr Malusek. "Semi-Automated 3D Segmentation of Pelvic Region Bones in Ct Volumes for the Annotation of Machine Learning Datasets." Radiation Protection Dosimetry, May 25, 2021. http://dx.doi.org/10.1093/rpd/ncab073.

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Abstract Automatic segmentation of bones in computed tomography (CT) images is used for instance in beam hardening correction algorithms where it improves the accuracy of resulting CT numbers. Of special interest are pelvic bones, which—because of their strong attenuation—affect the accuracy of brachytherapy in this region. This work evaluated the performance of the JJ2016 algorithm with the performance of MK2014v2 and JS2018 algorithms; all these algorithms were developed by authors. Visual comparison, and, in the latter case, also Dice similarity coefficients derived from the ground truth we

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Jaamialahmadi, A., and M. Kadkhodayan. "A Modified Storen-Rice Bifurcation Analysis of Sheet Metal Forming Limit Diagrams." Journal of Applied Mechanics 79, no. 6 (2012). http://dx.doi.org/10.1115/1.4005538.

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Bifurcation analysis is a theoretical prediction approach to measure the FLD when the localized neck causes development of vertex on subsequent yield surface as was adopted by Storen-Rice. Some analyses lead to solutions for special cases such as zero and minimum extension. They offer an equation which needs to be optimized with respect to the minimum limit strain versus neck orientation for the whole domain of FLD. Moreover, the previous reported results for the left-hand side of FLD are not quite satisfactory. In this paper, a re-investigation into bifurcation analysis adopted by S-R lead to

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Mustafa, Sayed Saeed. "Investigation of the safety features of advanced PWR assembly using SiC, Zr, FeCrAl and SS-310 as cladding materials." Scientific Reports 11, no. 1 (2021). http://dx.doi.org/10.1038/s41598-021-96954-9.

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AbstractIn this work, SiC (Silicon carbide), FeCrAl (ferritic), SS-310 (stainless steel 310) and Zirconium are simulated by MCNPX (Monte Carlo N‐Particle eXtended) code as cladding materials in advanced PWR (Pressurized Water Reactor) assembly. A number of reactor safety parameters are evaluated for the candidate cladding materials as reactivity, cycle length, radial power distribution of fuel pellet, reactivity coefficients, spectral hardening, peaking factor, thermal neutron fraction and delayed neutron fraction. The neutron economy presented by Zr and SiC models is analyzed through the burn

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Panicker, Sudhy S., and Sushanta Kumar Panda. "Improvement in Material Flow During Nonisothermal Warm Deep Drawing of Nonheat Treatable Aluminum Alloy Sheets." Journal of Manufacturing Science and Engineering 139, no. 3 (2016). http://dx.doi.org/10.1115/1.4034594.

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Automotive industries are very much interested in implementing warm forming technology for fabrication of light weight auto-body panels using aluminum alloys without localized thinning or splitting. A nonheat treatable and low formable AA5754-H22 aluminum alloy sheet was selected in the present work, and a laboratory scale warm deep drawing test set-up and process sequences were designed to improve material flow through independent heating of punch and dies. Significant enhancement in cup depth was observed when the temperature of punch and dies were set to 30 °C and 200 °C, respectively. Ther

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