A mathematical model of the accumulation of damages and a criterion of the limiting state of metals and alloys in active plastic deformation under conditions of proportional loading

1997 ◽  
Vol 29 (1) ◽  
pp. 32-38
Author(s):  
V. M. Mozharovskii
Keyword(s):  
Mathematical Model ◽  
Plastic Deformation ◽  
Metals And Alloys ◽  
Proportional Loading ◽  
Limiting State ◽  
State Of Metals

R&D of NanoSPD Materials in Ufa via International Cooperation

2008 ◽  
Vol 584-586 ◽  
pp. 9-15 ◽  
Author(s):  
Tasha Reshetnikova ◽  
Milyausha R. Salakhova ◽  
Zarema A. Safargalina ◽  
Andrey V. Shcherbakov
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
International Cooperation ◽  
Nanostructured Materials ◽  
Metals And Alloys ◽  
Advanced Materials ◽  
Nanostructured Metals ◽  
Innovative Potential ◽  
Technical University ◽  
Competing Technologies

This report presents main achievements of international R&D activities of the Institute of Physics of Advanced Materials of Ufa State Aviation Technical University (Ufa, Russia) with a special attention to the innovative potential of nanostructured metals and alloys produced by severe plastic deformation techniques. Several examples of the first promising applications of bulk nanostructured materials as well as potential competing technologies are considered and discussed.

scholarly journals Slicing Ceramics on Material Removed by a Single Abrasive Particle

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4324
Author(s):  
Yao-Yang Tsai ◽  
Ming-Chang Wu ◽  
Yunn-Shiuan Liao ◽  
Chung-Chen Tsao ◽  
Chun-Yao Hsu
Keyword(s):  
Mathematical Model ◽  
Plastic Deformation ◽  
Brittle Fracture ◽  
Material Removal ◽  
Equations Of Motion ◽  
Abrasive Particle ◽  
Brittle Materials ◽  
Machining Parameters ◽  
Wire Saw ◽  
Cutting Model

Multi-wire saw machining (MWSM) used for slicing hard-brittle materials in the semiconductor and photovoltaic industries is an important and efficient material removal process that uses free abrasives. The cutting model of single-wire saw machining (SWSM) is the basis of MWSM. The material removal mechanism of SWSM is more easily understood than MWSM. A mathematical model (includes brittle fracture and plastic deformation) is presented in this paper for SWSM ceramic with abrasives. This paper determines the effect of various machining parameters on the removal of hard-brittle materials. For brittle fracture of SWSM ceramics, the minimum strain energy density is used as a fracture criterion. For plastic deformation of SWSM ceramics, the material removal is calculated using equations of motion. Actual wire-sawing experiments are conducted to verify the results of the developed mathematical model. The theoretical results agree with experimental data and practical experience. From the developed mathematical model, brittle fracture plays a major role in material removal of SWSM ceramics. Wire speed (S) and working load (P) are positively correlated with material removal of SWSM ceramics. The coefficient of friction is low, a lateral crack, which propagates almost parallel to the working surface, leads to more brittle fracture and material removal is increased.

scholarly journals Plastic Deformation of Metal Tubes Subjected to Lateral Blast Loads

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Kejian Song ◽  
Yuan Long ◽  
Chong Ji ◽  
Fuyin Gao
Keyword(s):  
Mathematical Model ◽  
Plastic Deformation ◽  
Plastic Flow ◽  
Cross Section ◽  
Circular Tube ◽  
Circular Tubes ◽  
Simply Supported ◽  
Different Dimensions ◽  
Thin Walled ◽  
Wave Induced

When subjected to the dynamic load, the behavior of the structures is complex and makes it difficult to describe the process of the deformation. In the paper, an analytical model is presented to analyze the plastic deformation of the steel circular tubes. The aim of the research is to calculate the deflection and the deformation angle of the tubes. A series of assumptions are made to achieve the objective. During the research, we build a mathematical model for simply supported thin-walled metal tubes with finite length. At a specified distance above the tube, a TNT charge explodes and generates a plastic shock wave. The wave can be seen as uniformly distributed over the upper semicircle of the cross-section. The simplified Tresca yield domain can be used to describe the plastic flow of the circular tube. The yield domain together with the plastic flow law and other assumptions can finally lead to the solving of the deflection. In the end, tubes with different dimensions subjected to blast wave induced by the TNT charge are observed in experiments. Comparison shows that the numerical results agree well with experiment observations.

Microstructure and Texture Evolution in Metals and Alloys during Intense Plastic Deformation

2012 ◽  
Vol 715-716 ◽  
pp. 51-60 ◽  
Author(s):  
Alexandre P. Zhilyaev ◽  
Terry R. McNelley ◽  
Oscar A. Ruano
Keyword(s):  
Plastic Deformation ◽  
Grain Refinement ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Texture Evolution ◽  
Pure Aluminum ◽  
Liquid Nitrogen Temperature ◽  
Metals And Alloys ◽  
Work Piece ◽  
Friction Stir

ntense plastic deformation is generally effective in producing grain refinement. IPD methods include equal channel angular pressing/extrusion (ECAP/ECAE), high-pressure torsion (HPT), accumulative roll bonding (ARB), and friction stir processing (FSP), among others. In this work, we summarize the main results on grain refinement by these processing methods and present our own data on microstructure and texture evolution in metals and alloys during ECAP, HPT and FSP. Whereas ECAP and HPT are usually performed with the work piece material initially at room temperature or even at liquid nitrogen temperature to enhance refinement, FSP involves a brief but complex thermomechanical cycle with peak temperatures up to 0.7 0.9 TMelt. Apparently, materials undergo dynamic recrystallization (DRX) during FSP. DRX also occurs also in metals and alloys of low TMeltdue to adiabatic heating during HPT performed at room temperature. The paper is devoted to revisiting of previous as well as new results and a comparative analysis of microstructure and texture evolution in commercially pure aluminum and selected pure metals and alloys during ECAP, HPT and FSP in order to illustrate the limits of grain refinement.

Laws of electrical stimulation of plastic deformation of metals and alloys at various structural levels

1996 ◽  
Vol 39 (3) ◽  
pp. 237-261 ◽  
Author(s):  
V. E. Gromov ◽  
L. B. Zuev ◽  
V. I. Bazaikin ◽  
V. Ya. Tsellermaer
Keyword(s):  
Plastic Deformation ◽  
Electrical Stimulation ◽  
Metals And Alloys ◽  
Structural Levels ◽  
Stimulation Of

Chaotic Phenomena Induced by the Fast Plastic Deformation of Metals During Cutting

2005 ◽  
Vol 73 (2) ◽  
pp. 240-245 ◽  
Author(s):  
Zoltan Palmai
Keyword(s):  
Mathematical Model ◽  
Plastic Deformation ◽  
Shear Stress ◽  
General Structure ◽  
Equation System ◽  
Qualitative Description ◽  
Balance Equations ◽  
Different Types ◽  
Energy Equations ◽  
The Mathematical Model

In the present study the examination of chip formation is focused on the primary shear zone, which is divided into two layers, and the variation of shear stress and temperature in time are given by two mechanical balance equations and three energy equations. All the five evolution differential equations are autonomous and nonlinear. The material characteristics are determined by an exponential constitutive equation. The mathematical model is suitable for the qualitative description of different types of chips, such as continuous chips and periodic or aperiodic shear localized chips, which is demonstrated by the general structure and typical solutions of the equation system.

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