Effect of the geometrical parameters of the sample on plastic deformation in the bonding zone of pressure welding of dissimilar heat resistant alloys

10.12737/6779 ◽  
2014 ◽  
Vol 2 (5) ◽  
pp. 171-174
Author(s):  
E. Valitova ◽  
A. Ahunova ◽  
S. Dmitriev ◽  
V. Valitov
Keyword(s):  
Plastic Deformation ◽  
Geometrical Parameters ◽  
Pressure Welding ◽  
Heat Resistant ◽  
Bonding Zone

A Computational Comparative Study of the Lithium Diffusion in Amorphous Silicon Spheres, Rods, and Circular Disks

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Minh-Quy Le ◽  
Huu-Tu Nguyen ◽  
Thanh-Lam Bui
Keyword(s):  
Plastic Deformation ◽  
Amorphous Silicon ◽  
Lithium Concentration ◽  
Critical Value ◽  
Homogeneous Distribution ◽  
Geometrical Parameters ◽  
Element Analysis ◽  
Lithium Diffusion ◽  
Silicon Spheres ◽  
Circular Disks

Abstract We study through extensive finite element analysis the lithium diffusion in small elements of Si anodes under the forms of spheres, rods, and circular disks for Li-ion batteries. Elastoplastic properties of the amorphous silicon are assumed to be lithium concentration-dependent. Effects of the normalized flux of Li-ions on the lithium concentrations, stresses, and total equivalent plastic strains are considered. Effects of the disk's thickness are also included. At a given normalized flux, the heterogeneity of the lithiation, stresses, and plastic deformation increases in the order: disk, sphere, and rod. The thinner disk the better performance is. Below a critical value of the normalized flux of Li-ions, silicon spheres and disks exhibit linear elasticity and homogeneous distribution of Li-ions, whereas silicon rods undergo always plastic deformation after lithiation. When the radii of these three structures are smaller than several micrometers and the normalized flux is taken as 95% of their critical value, the charge time falls in the range from minutes to several hours. Our findings will help to optimize the charge and geometrical parameters for silicon anodes.

Relationships governing plastic deformation in pressure welding dissimilar materials

2005 ◽  
Vol 19 (1) ◽  
pp. 68-72 ◽  
Author(s):  
L I Markashova ◽  
V V Arsenyuk ◽  
G M Grigorenko
Keyword(s):  
Plastic Deformation ◽  
Dissimilar Materials ◽  
Pressure Welding

scholarly journals Modeling of heat-resistant nickel alloy pressure welding using ultrafine grained gasket

2014 ◽  
Vol 4 (3) ◽  
pp. 190-194 ◽  
Author(s):  
E. V. Valitova ◽  
A. Kh. Akhunova ◽  
V. A. Valitov ◽  
S. V. Dmitriev ◽  
R. Ya. Lutfullin ◽  
...  
Keyword(s):  
Nickel Alloy ◽  
Pressure Welding ◽  
Heat Resistant ◽  
Ultrafine Grained

scholarly journals Model of long-length part flattening by mobile local bend

2018 ◽  
Vol 2018 (6) ◽  
pp. 44-48
Author(s):  
Альберт Королев ◽  
Albert Korolev ◽  
Михаил Решетников ◽  
Mihail Reshetnikov ◽  
Сергей Савран ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Bending Moment ◽  
Energy Approach ◽  
Geometrical Parameters ◽  
Technological Parameters ◽  
Continuous Rotation ◽  
Cycle Loading ◽  
Uniform Area

In the paper there is described a method of flattening and stabilization of geometrical parameters of long-length parts. The method is based on the formation of a uniform area displacement of an elasto-plastic deformation formed by a bending moment at continuous rotation of a part which results in the occurrence of multi-cycle loading. Because of the action of controlled multi-cycle loading takes place an accumulation and further relaxation of inner stresses. The process of flattening and stabilization of geometrical parameters is described by a simulator showing a tie between geometrical, physic-mechanical and technological parameters. At the heart of a simulator is an energy approach to the description of an elasto-plastic deformation of a part at multi-cycle loading.

scholarly journals IMPROVEMENT OF OFFICIAL CHARACTERISTICS OF THE SURFACE LAYER DETAILS BY APPLICATION OF SURFACE PLASTIC DEFORMATION AND GASODYNAMYNAMYNAMINE

2020 ◽  
pp. 90-100
Author(s):  
Viktor Matviychuk ◽  
Oleg Haidamak ◽  
Mykola Kolesnik
Keyword(s):  
Plastic Deformation ◽  
Surface Plastic Deformation ◽  
Cold Gas Dynamic Spraying ◽  
Thin Plates ◽  
Geometrical Parameters ◽  
Surface Plastic ◽  
Gradual Change ◽  
Gas Dynamic ◽  
Multi Stage ◽  
Cold Gas

The article investigates changes in the characteristics of the surface layers of parts processed by methods of surface plastic deformation (SPD). It is shown that at SPD the strength and hardness characteristics of the material increase and residual compression stresses are formed. On the basis of the study of the stress-strain state of the material at the SPD, its non-monotonicity is established, which is manifested in the gradual change of sign of the components of deformations and stresses. In this regard, a tensor-nonlinear damage accumulation model was used to evaluate the deformability of the material, which takes into account the directional nature of the damage and the anisotropy of the plasticity of the deformed metal. Based on this model, an expression was obtained to determine the plasticity resource used in the case of multi-stage SPD. According to the results of the calculations, it is established that the maximum plasticity resource used in the SPD is at a depth of approximately 0.1 of the diameter of the plastic footprint of the tool, and destruction at full exhaustion of the plasticity resource occurs in the form of peeling of thin plates of appropriate thickness. Recommendations for displacement of the most reinforced layers to the surface of the workpiece are developed, as well as recommendations for limiting deformation by the amount of plasticity resource used. The conducted research allows to assign the optimal modes of SPD at the stage of technological process design. A device for cold gas-dynamic spraying was developed and the possibility of creating antifriction sections using it was investigated. Graphs of dependence of geometrical parameters of the deposited layer on the sputtering distance are constructed and methods and schemes of preparation for deposition of the surface of the workpiece using SPD methods are developed. Experimental cold gas-dynamic spraying was carried out and optimal parameters of the process of spraying of antifriction layers of bronze and metal polymers (pressure, and the temperature of the compressed air and the temperature of the workpiece) on the formed roller surface were determined. A new concept of increasing the contact strength and durability of friction pairs is proposed.

scholarly journals MODELING COMPLEX PLASTIC DEFORMATION AND FATIGUE DAMAGEACCUMULATION IN HEAT-RESISTANT ALLOYSUNDER COMBINED THERMAL-MECHANICAL LOADING

2016 ◽  
Vol 78 (1) ◽  
pp. 45-59
Author(s):  
Yu. G. Korotkikh ◽  
◽  
I. A. Volkov ◽  
L. A. Igumnov ◽  
D. N. Shishulin ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Mechanical Loading ◽  
Heat Resistant

Effect of Severe Plastic Deformation on Microstructure and Properties of Al-Cu-Mg-Ag Aluminum Alloys

2010 ◽  
Vol 667-669 ◽  
pp. 599-604
Author(s):  
Dai Hong Xiao ◽  
Min Song ◽  
Kang Hua Chen
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Aging Treatment ◽  
Ingot Metallurgy ◽  
Scanning Calorimetry ◽  
Hardness Tester ◽  
Heat Resistant Alloy ◽  
Heat Resistant ◽  
Aging Hardening ◽  
Technology Effects

The Al-Cu-Mg-Ag heat-resistant alloy were prepared by ingot metallurgy technology. Effects of serve plastic deformation on microstructure and mechanical properties of the alloy were investigated by microscopy, differential scanning calorimetry and hardness tester. It has been shown that serve plastic deformation in the solid solution and quenching state with aging treatment was found to be quite effective in refining the grains to 2 μm, and improving the mechanical properties and heat-resistant properties of the extruded Al-Cu-Mg-Ag alloy. Serve plastic deformation treatment accelerates the aging hardening process of the extruded alloys, increases the density of precipitate phase.

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