Three-Dimensional Analysis of Extrusion Process Utilizing the Physical Modeling Technique

1993 ◽  
Vol 115 (1) ◽  
pp. 32-40 ◽  
Author(s):  
H. Sofuog˜lu ◽  
J. Rasty
Keyword(s):  
Physical Modeling ◽  
Cone Angle ◽  
Three Dimensional ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Modeling Technique ◽  
Modeling Material ◽  
Internal Deformation ◽  
Metal Extrusion ◽  
Deformation Patterns

The purpose of this study was to simulate the metal extrusion processes via three-dimensional physical modeling technique. Plasticine was utilized as the modeling material, while plexiglass was incorporated in the design and fabrication of a labscale extrusion apparatus. The extrusion setup was designed to accommodate dies of different semi-cone angle while also making it possible to change the extrusion ratio R = A0/Af. Cylindrical billets were prepared utilizing alternating layers of two colors of plasticine. Extrusion of cylindrical billets was conducted at three different reduction ratios and three different die angles for each reduction ratio. Dissection of the extruded billets along a centroidal plane revealed the internal deformation patterns which were subsequently utilized for determining the effect of the die angle and extrusion ratio on the state of strain in the final product as well as the required extrusion loads.

Mathematical Modeling of Metal Extrusion Process

1982 ◽  
Vol 104 (1) ◽  
pp. 65-70 ◽  
Author(s):  
S. Bhattacharyya ◽  
A. K. Majumdar ◽  
S. K. Basu
Keyword(s):  
Mathematical Modeling ◽  
Finite Difference ◽  
Flow Field ◽  
Metal Forming ◽  
Dimensionless Parameter ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Forming Process ◽  
Metal Forming Process ◽  
Metal Extrusion

The present paper describes a novel calculation procedure for the detailed prediction of flow field during the process of metal extrusion. The flow of metal has been regarded as a flow of highly viscous Newtonian fluid. A finite-difference algorithm commonly used for solving hydrodynamics has been adapted to develop an improved prediction procedure. The predicted flow field compares well with the available experiments. A new dimensionless parameter which has been shown to represent the metal forming process has been identified; its relationship with extrusion ratio has also been demonstrated.

Effects of Extrusion-Shear and Direct Extrusion on the Plastic Deformation of AZ31 Magnesium Alloy

2018 ◽  
Vol 913 ◽  
pp. 176-181
Author(s):  
Hong Jun Hu ◽  
Zhao Sun ◽  
Ding Fei Zhang
Keyword(s):  
Magnesium Alloy ◽  
Three Dimensional ◽  
Coupled Model ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Channel Angle ◽  
Direct Extrusion ◽  
Angular Pressing ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Based on characteristics of direct extrusion for magnesium alloy seamless tube and continuous equal channel angular pressing (ECAP) of tubes, a new composite extrusion process of tubes including direct extrusion and many steps ECAP was invented firstly, which are shorten for TES process in this paper. A three-dimensional finite element thermo-mechanical coupled model and conditions for TES process were established. The extrusion process and cumulative strains evolution during TES process were simulated. The results show that TES process can improve the cumulative strains significantly. The microstructures observations of longitudinal sections for tubes fabricated by direct extrusion and TES process were carried out. It was found that when the extrusion temperature was 400°C, and extrusion ratio was 8.4 and the channel angle was 150°, TES process can refine the microstructures of tubes effectively.

Computer Application to the Visioplasticity Method

1967 ◽  
Vol 89 (2) ◽  
pp. 339-346 ◽  
Author(s):  
A. Shabaik ◽  
S. Kobayashi
Keyword(s):  
Plane Strain ◽  
Complete Solution ◽  
Effective Strain ◽  
Cone Angle ◽  
Extrusion Process ◽  
Axisymmetric Deformation ◽  
Extrusion Ratio ◽  
Computer Application ◽  
White Lead ◽  
Pure Lead

Procedures for using a computer for the complete solution to plane strain as well as axisymmetric deformation problems have been developed. The velocity, strain rate, total effective strain, and stress distributions were obtained for two commercially pure lead specimens extruded in a forward extrusion process using white lead in oil as a lubricant. The axisymmetric extrusion was carried out at a speed of 1/8 ipm through a conical die having a 45 deg half-cone angle with a 2:1 extrusion ratio, and the plane-strain extrusion through a tapered die having a 45 deg half-taper angle with a 1.66:1 extrusion ratio.

Influence of Extrusion Ratio on Forming of Thick-Walled Tube

2011 ◽  
Vol 217-218 ◽  
pp. 952-957
Author(s):  
Jian Zhang ◽  
Jian Hua Song ◽  
Xiao Lan Wang ◽  
Xue Qin Jin ◽  
Zhi Hua Wang
Keyword(s):  
Large Diameter ◽  
Three Dimensional ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Stress And Strain ◽  
The Finite Element Method ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Modeling Software ◽  
Distribution Of Stress

Employed DEFORM software to simulate vertical extrusion of large diameter thick-walled pipe, by using the Finite Element Method in the three-dimensional modeling software Pro/E of the CAD platform. Analyze the law of blank flow in extrusion process, distribution of stress and strain, and the influence of different extrusion ratio on deformation of thick-walled tube comparatively.

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

scholarly journals Acoustic Cell Patterning in Hydrogel for Three-Dimensional Cell Network Formation

Micromachines ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 3
Author(s):  
Kyo-in Koo ◽  
Andreas Lenshof ◽  
Le Thi Huong ◽  
Thomas Laurell
Keyword(s):  
Network Formation ◽  
Umbilical Vein ◽  
Three Dimensional ◽  
Extrusion Process ◽  
Fibroblast Cells ◽  
Glass Capillary ◽  
Cell Network ◽  
Significant Difference ◽  
The One ◽  
Umbilical Vein Endothelial Cells

In the field of engineered organ and drug development, three-dimensional network-structured tissue has been a long-sought goal. This paper presents a direct hydrogel extrusion process exposed to an ultrasound standing wave that aligns fibroblast cells to form a network structure. The frequency-shifted (2 MHz to 4 MHz) ultrasound actuation of a 400-micrometer square-shaped glass capillary that was continuously perfused by fibroblast cells suspended in sodium alginate generated a hydrogel string, with the fibroblasts aligned in single or quadruple streams. In the transition from the one-cell stream to the four-cell streams, the aligned fibroblast cells were continuously interconnected in the form of a branch and a junction. The ultrasound-exposed fibroblast cells displayed over 95% viability up to day 10 in culture medium without any significant difference from the unexposed fibroblast cells. This acoustofluidic method will be further applied to create a vascularized network by replacing fibroblast cells with human umbilical vein endothelial cells.

Development of program-driven plug-in for conical counter-rotating twin screw based on SolidWorks

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Liqun Dong ◽  
Junwei Zhang ◽  
Liang Qin ◽  
Ping Xue ◽  
Yun Ma ◽  
...  
Keyword(s):  
Parametric Design ◽  
Cone Angle ◽  
Three Dimensional ◽  
Visual Basic ◽  
Automatic Generation ◽  
Three Dimensional Model ◽  
Modeling Process ◽  
Basic Language ◽  
Twin Screw ◽  
Visual Basic Language

Abstract Owing to the existence of the cone angle, the size of a conical counter-rotating twin screw continuously changes along the axis, so it is not easy to model using SolidWorks. In this study, the parametric design of the modeling process is completed based on the Visual Basic language and a program-driven method. Finally, the SolidWorks program plug-in and user interface are developed to complete the automatic generation of the three-dimensional model of a conical counter-rotating twin screw.

scholarly journals Testing the influence of a sand mica mixture on basin fill in extension and inversion experiments

2015 ◽  
Vol 87 (1) ◽  
pp. 51-62 ◽  
Author(s):  
CAROLINE J.S. GOMES ◽  
TAYNARA D'ANGELO ◽  
GISELA M.S. ALMEIDA
Keyword(s):  
Shear Stress ◽  
Physical Models ◽  
Normal Faults ◽  
Striking Difference ◽  
Fault Propagation ◽  
Peak Shear Stress ◽  
Internal Deformation ◽  
Deformation Patterns ◽  
And Inversion ◽  
Basin Fill

We compare the deformation patterns produced by sand and a sand mica mixture (14:1 ratio of sand to mica by weight) while simulating basin fill in extension and inversion models to analyze the potential of the sand mica mixture for applications that require a strong elasto-frictional plastic analogue material in physical models. Sand and the sand mica mixture have nearly equal angles of internal friction, but the sand mica mixture deforms at a significantly lower level of peak shear stress. In extension, the sand mica mixture basin fill experiments show fewer normal faults. During inversion, the most striking difference between the sand and the sand mica mixture basin fill experiments is related to the internal deformation in fault-propagation folds, which increases with an increase in the basal friction. We conclude that our strongly elasto-frictional plastic sand mica mixture may be used to simulate folds in experiments that focus on mild inversion in the brittle crust.

Study on Engineering Mechanical Properties of Mayanpo Slope at Xiangjiaba Hydropower Station

2012 ◽  
Vol 548 ◽  
pp. 511-515
Author(s):  
Jian Hui Sun ◽  
Long Jiang ◽  
Wan Shun Wang ◽  
Chen Lin Xiong ◽  
Zhao Hui Zhu
Keyword(s):  
Mechanical Properties ◽  
Field Test ◽  
Dynamic Equilibrium ◽  
Three Dimensional ◽  
Strength Reduction ◽  
Hydropower Station ◽  
Weak Interlayer ◽  
Internal Deformation ◽  
Three Stages ◽  
Changing Rate

Through the field test of Mayanpo slope at Xiangjiaba Hydropower Station, external deformation, deep deformation, groundwater level and stability of the slope with weak interlayer are analyzed in this paper. The results show that: ① displacement deformation increases with time and decreases with increasing depth. Changes of displacement can be divided into three stages: deformation rapidly increases in the early, and slowly increases in the medium, and becomes gradually stable in the later. Changing rate of displacement decreases with time, and the rate can also be divided into three stages, basically consistent with the displacement changing stage; ② a certain thickness of weak interlayer and evident dislocation exists in slope strata. Dislocation rate first increases and then decreases until basically stable, and local fluctuation is mainly affected by rainfall and dynamic equilibrium adjustment of the slope internal deformation; ③based on the penalty function contact of pile soil and the surface of rock mass, the three-dimensional numerical model of coupling of seepage and strain has been established, and through analyzing and comparing with field test data, it is verified that the model is feasible in the study on slope deformation; ④ through stability analysis of Mayanpo slope by strength reduction FEM, stability coefficient is 1.72.

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