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cap-plasticity-model
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Contact friction simulation in powder compaction process based on the penalty approach
, Article Materials and Design ; Volume 29, Issue 6 , 2008 , Pages 1199-1211 ; 02613069 (ISSN) ; Khoei, A. R ; Khaloo, A. R ; Sharif University of Technology
Elsevier Ltd
2008
Abstract
In this paper, the influence of powder-tool friction on the mechanical properties of the final product is investigated in pressing metal powders. A computational algorithm is presented for simulation of frictional contact in the compaction process of powder. The large deformation finite element (FE) formulation is characterized by the use of penalty approach in which a plasticity theory of friction is incorporated to simulate sliding resistance at the powder-tool interface. The constitutive relations for friction are derived from a Coulomb friction law. A double-surface cap plasticity model is employed together with the nonlinear contact friction behavior in numerical simulation of powder...
An arbitrary lagrangian-eulerian technique for plasticity of pressure-sensitive material with reference to powder forming processes
, Article 9th International Conference on Technology of Plasticity, ICTP 2008, Gyeongju, 7 September 2008 through 11 September 2008 ; 2008 , Pages 1825-1830 ; Anahid, M ; Dormohammadi, H ; Shahim, K ; Sharif University of Technology
Hanrimwon Publishing Co
2008
Abstract
In this paper, an application of arbitrary Lagrangian-Eulerian method is presented in plasticity behavior of pressure-sensitive material, with special reference to large deformation analysis of powder compaction process. In ALE technique, the convective term is used to reflect the relative motion between the mesh and the material. The convection term is neglected in the material phase, which is identical to a time-step in a standard Lagrangian analysis. The stresses and plastic internal variables are converted to account the relative mesh-material motion in the convection phase. The ALE formulation is then performed within the framework of a three-invariant cap plasticity model in order to...
A three-invariant cap plasticity model with kinematic and anisotropic hardening rule for powder and granular materials
, Article 9th International Conference on Computational Plasticity: Fundamentals and Applications, COMPLAS IX, Barcelona, 5 September 2007 through 7 September 2007 ; Issue PART 2 , 2007 , Pages 604-607 ; 9788496736290 (ISBN) ; DorMohammadi, H ; Sharif University of Technology
2007
Abstract
In this paper, a three-invariant plasticity model is developed based on a single cap yield surface for the kinematic and anisotropic hardening behavior of powder and granular materials. The applicability of proposed plasticity model is demonstrated in numerical simulation of several triaxial and confining pressure tests on different powder and granular materials. © CIMNE, 2007
A three-invariant cap plasticity with isotropic-kinematic hardening rule for powder materials: Model assessment and parameter calibration
, Article Computational Materials Science ; Volume 41, Issue 1 , 2007 , Pages 1-12 ; 09270256 (ISSN) ; DorMohammadi, H ; Sharif University of Technology
2007
Abstract
The constitutive modeling of powder is clearly a keystone of successful quantitative solution possibilities. Without a reasonable constitutive model, which can reproduce complicated powder behavior under loading conditions, the computations are worthless. In this paper, a three-invariant cap plasticity model with isotropic-kinematic hardening rule is presented for powder materials. A generalized single-cap plasticity is developed which can be compared with some common double-surface plasticity models proposed for powders in literature. The hardening rule is defined based on the isotropic and kinematic material functions. The constitutive elasto-plastic matrix and its components are derived...
Application of rkpm in numerical simulation of powder forming processes using cap plasticity model
, Article 8th International Conference on Computational Plasticity: Fundamentals and Applications, COMPLAS VIII, Barcelona, 5 September 2005 through 7 September 2005 ; Issue PART 2 , 2005 , Pages 966-969 ; 849599979X (ISBN); 9788495999795 (ISBN) ; Khoei, A. R ; Sharif University of Technology
2005
Abstract
In this paper, an application of the Reproducing Kernel Particle Method is presented in numerical simulation of powder forming processes using a cap plasticity model. A double-surface cap plasticity is developed within the framework of large deformation analysis in order to predict the non-uniform relative density distribution during powder die pressing. The RKPM technique is employed in the analysis of 2D compaction simulation. Numerical examples are presented to illustrate the applicability of the algorithm in modelling of powder forming processes
Numerical Modeling and Optimization of Cold and Hot Powder Forming Processes
, Ph.D. Dissertation Sharif University of Technology ; Khoei, Amir Reza (Supervisor) ; Khalo, Ali Reza (Supervisor)
Abstract
In this thesis, a shape optimization technique is presented for powder forming processes based on the genetic algorithm approach. The numerical modeling of powder compaction simulation is applied based on a large deformation formulation, powder plasticity behavior, and frictional contact algorithm. A Lagrangian finite element formulation is employed for large powder deformations. A cap plasticity model is used in numerical simulation of nonlinear powder behavior. The influence of powder-tool friction is simulated by the use of penalty approach in which a plasticity theory of friction is incorporated to model sliding resistance at the powder-tool interface. For hot compaction process coupled...
Finite Element Modeling of Particle Distribution in Al/Powder Composite Sheets Processed by ARB for Manufacturing Aluminium Foams
, M.Sc. Thesis Sharif University of Technology ; Akbarzade, Abbas (Supervisor)
Abstract
In this study closed cell aluminum foam was manufactured through accumulative roll bonding (ARB). In this method, aluminum AA1050 strip was used as the matrix and calcium carbonate was selected as blowing agent powder. The strips were roll-bonded with reduction of 50% during each pass. The produced composite was then subjected to different foaming conditions in order to achieve foams with maximum porosity. Subsequently, influences of content of the blowing agent, time, pressure, number of rolling passes and heating rate on the percentage of porosities were evaluated. In optimum condition quantity of the blowing agent, foaming temperature, holding time and number of ARB passes were equal to 1...
Modelling of powder forming processes in transient-dynamic analysis of large plastic deformations
, Article Advanced Materials Research, 13 July 2011 through 16 July 2011 ; Volume 445 , July , 2012 , Pages 362-367 ; 10226680 (ISSN) ; 9783037853467 (ISBN) ; Biabanaki, S. O. R ; Parvaneh, S. M ; Turkish Airlines; TTNET; Gedik Holding; Istanbul Development Agency ; Sharif University of Technology
2012
Abstract
In this paper, a transient-dynamic analysis is presented for large deformation of powder forming process. The technique is employed using the contact friction algorithm and plasticity behavior of powder. The contact algorithm is applied by imposing the contact constraints and modifying the contact properties of frictional slip through the node-to-surface contact algorithm. A double-surface cap plasticity model is used for highly nonlinear behavior of powder. In order to predict the non-uniform density and stress distributions during powder die-pressing, the numerical schemes are examined for accuracy and efficiency in modeling of a set of powder components
Modeling of pressure-sensitive materials using a cap plasticity theory in extended finite element method
, Article AMPT/ANMEOS Part 2 ; Volume 164-165 , 2005 , Pages 1248-1257 ; 09240136 (ISSN) ; Azami, A. R ; Khoei, A. R ; Dobrzanski L ; Sharif University of Technology
2005
Abstract
In this paper, a new computational technique based on the extended finite element method (X-FEM) is presented in elasto-plastic behavior of pressure-sensitive material. The cap plasticity model is employed within the X-FEM framework in numerical simulation of powder die pressing. The double-surface plasticity model includes a failure surface and an elliptical yield cap, which closes the open space between the failure surface and hydrostatic axis. The yield cap expands in the stress space according to a specified hardening rule. Application of the X-FEM in simulation of two phase plasticity continuums is presented in an incremental manner and the role of sub-elements in the partition of unity...
Powder Compaction Simulation of Nonlinear Behavior of Material with Peridynamics Theory
, M.Sc. Thesis Sharif University of Technology ; Khoei, Amir Reza (Supervisor)
Abstract
The present research focuses on the simulation of the metallic powder compaction process with the Peridynamics theory. Various methods are exploited to simulate this process in literature. Studying the nonlinear behavior of powders includes different phenomena such as dislocation and grain boundary, making it complicated. However, numerous research has been shaped to consider these phenomena on the micro-scale. There is also another batch of nano-scale studies underway. In this class of simulations, considering atoms as rigid particles, interatomic potentials, and molecular dynamics methods are used. Because of atomic-scale precision, this approach has very high accuracy. The massive...
Genetic algorithm-based numerical optimization of powder compaction process with temperature-dependent cap plasticity model
, Article International Journal of Advanced Manufacturing Technology ; Volume 64, Issue 5-8 , 2013 , Pages 1057-1072 ; 02683768 (ISSN) ; Khoei, A. R ; Molaeinia, Z ; Sharif University of Technology
2013
Abstract
In this paper, a shape optimization technique is presented for the cold and hot isostatic pressing of metal powders based on the genetic algorithm (GA) approach. The GA technique is used to obtain the desired optimal compacted component by changing the boundaries of component and verifying the prescribed constraints. The coupled thermomechanical analysis of hot isostatic pressing is employed for metal powders during densification process. The numerical modeling of hot powder compaction simulation is performed based on the large deformation formulation, temperature-dependent cap plasticity model, and frictional contact algorithm. The modified cap plasticity takes the temperature effects into...
Dynamic modeling of powder compaction processes via a simple contact algorithm
, Article International Journal of Mechanical Sciences ; Volume 64, Issue 1 , 2012 , Pages 196-210 ; 00207403 (ISSN) ; Biabanaki, S. O. R ; Parvaneh, S. M ; Sharif University of Technology
2012
Abstract
In this paper, the dynamic modeling of powder compaction processes is presented based on a simple contact algorithm to evaluate the distribution of final density in dynamic powder die-pressing. The large deformation frictional contact is employed by imposing the contact constraints via the contact node-to-surface formulation and modifying the contact properties of frictional slip. The Coulomb friction law is used to simulate the friction between the rigid punch and the work-piece. The nonlinear contact friction algorithm is employed together with a double-surface cap plasticity model within the framework of large FE deformation in order to predict the non-uniform relative density...
3D contact modelling of large plastic deformation in powder forming processes
, Article International Journal of Material Forming ; Volume 5, Issue 2 , 2012 , Pages 163-173 ; 19606206 (ISSN) ; Biabanaki, S. O. R ; Taheri Mousavi, S. M ; Vafa, A. R ; Parvaneh, S. M ; Sharif University of Technology
2012
Abstract
In this paper, the three-dimensional large frictional contact deformation of powder forming process is modeled using a node-to-surface contact algorithm based on the penalty and augmented-Lagrange approaches. The technique is applied by imposing the normal and tangential contact constraints and modifying the contact properties of frictional slip. The Coulomb friction law is employed to simulate the friction between the rigid punch and the work piece. It is shown that the augmented-Lagrange technique significantly improves imposing of the constraints on contact surfaces. In order to predict the non-uniform relative density and stress distributions during the large deformation of powder...
Optimal design of powder compaction processes via genetic algorithm technique
, Article Finite Elements in Analysis and Design ; Volume 46, Issue 10 , 2010 , Pages 843-861 ; 0168874X (ISSN) ; Keshavarz, S ; Biabanaki, S. O. R ; Sharif University of Technology
Abstract
In this paper, an optimal design is performed for powder die-pressing process based on the genetic algorithm approach. It includes the shape optimization of powder component, the optimal design of punch movements, and the friction optimization of powdertool interface. The genetic algorithm is employed to perform an optimal design based on a fixed-length vector of design variables. The technique is used to obtain the desired optimal compacted component by verifying the prescribed constraints. The numerical modeling of powder compaction simulation is applied based on a large deformation formulation, powder plasticity behavior, and frictional contact algorithm. A Lagrangian finite element...
3D dynamic modeling of powder forming processes via a simple and efficient node-to-surface contact algorithm
, Article Applied Mathematical Modelling ; Volume 37, Issue 1-2 , 2013 , Pages 443-462 ; 0307904X (ISSN) ; Biabanaki, S. O. R ; Parvaneh, S. M ; Sharif University of Technology
2013
Abstract
In this paper, a simple and efficient contact algorithm is presented for the evaluation of density distribution in three-dimensional dynamic modeling of powder compaction processes. The contact node-to-surface algorithm is employed to impose the contact constraints in large deformation frictional contact, and the contact frictional slip is modified by the Coulomb friction law to simulate the frictional behavior between the rigid punch and the work-piece. The 3D nonlinear contact friction algorithm is employed together with a double-surface cap plasticity model within the framework of large finite element deformation in order to predict the non-uniform relative density distribution during the...
The genetic algorithm approach for shape optimization of powder compaction processes considering contact friction and cap plasticity models
, Article Engineering Computations (Swansea, Wales) ; Volume 27, Issue 3 , 2010 , Pages 322-353 ; 02644401 (ISSN) ; Keshavarz, Sh ; Khaloo, A. R ; Sharif University of Technology
Abstract
Purpose - The purpose of this paper is to present a shape optimization technique for powder forming processes based on the genetic algorithm approach. The genetic algorithm is employed to optimize the geometry of component based on a fixed-length vector of design variables representing the changes in nodal coordinates. The technique is used to obtain the desired optimal compacted component by changing the boundaries of component and verifying the prescribed constraints. Design/methodology/approach - The numerical modeling of powder compaction simulation is applied based on a large deformation formulation, powder plasticity behavior, and frictional contact algorithm. A Lagrangian finite...