Numerical Modeling of Nanostructured Tube Produced by ECAP

2018 ◽  
Vol 780 ◽  
pp. 25-31 ◽  
Author(s):  
Faramarz Djavanroodi ◽  
Fahd Almufadi
Keyword(s):  
Numerical Simulation ◽  
Grain Size ◽  
Three Dimensional ◽  
Physical And Mechanical Properties ◽  
Copper Tube ◽  
Angular Pressing ◽  
Key Factor ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Explicit Solver

— tailoring material properties to specific application requirements is one of the major challenges in materials engineering. Grain size is a key factor affecting physical and mechanical properties of polycrystals materials. Grain size reduction in the metals and alloys can be achieved using Equal channel angular pressing (ECAP) method. In this work, Nanostructure thin walled copper tube specimens with 1 mm wall thickness and 23mm diameter have been produced successfully with ECAP method using flexible polyurethane rubber pad to prevent the tube walls from collapsing. Furthermore, this paper details the development of a numerical simulation to analyse the fabrication of thin walled tube through ECAP process. A copper tube was pushed through a channel with a series of 90° bends. During each successive bend, the magnitude of plastic strains accumulate in the copper tube. A three dimensional numerical simulation was used to model the process and determine the extent of plastic deformation that takes place during each bend process. The numerical simulation was developed using the finite element (FE) code, ABAQUS V6.13, and analysed using the explicit solver.

Folding and Deployment of a New Thin-Walled Tube Flexible Hinge

2014 ◽  
Vol 635-637 ◽  
pp. 365-369 ◽  
Author(s):  
Hui Yang ◽  
Rong Qiang Liu ◽  
Hong Wei Guo ◽  
Jian Guo Tao
Keyword(s):  
Finite Element Analysis ◽  
Strain Curve ◽  
Tension Test ◽  
Slot Width ◽  
Stress Strain Curve ◽  
Element Analysis ◽  
Flexible Hinge ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Explicit Solver

A new thin-walled tube flexible hinge with six slots is proposed. The slot geometry is parameterized in terms of slot width, length and distance between two adjacent slots. The experiment for tension test of the thin-walled tube hinge with six-slots is conducted by INSTRON and the tensile stress-strain curve is measured. Finite element analysis to investigate the quasi-static folding and deployment of the new hinges by ABAQUS/Explicit solver are employed to perform a series of parameter studies for the slots longitude lengthl0, the slot widthwand the distancedbetween two adjacent slots.

scholarly journals Research on Model Slice and Forming Method of Thin-walled Parts

2021 ◽  
Vol 233 ◽  
pp. 04046
Author(s):  
Changhao Zhang ◽  
Hu Li ◽  
Jianyu Yang ◽  
Huawei Lu ◽  
Peng Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Simulation Method ◽  
Processing Parameters ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Thin Walled ◽  
Experimental Processing

According to the structural characteristics of thin-walled parts, a model slicing method is proposed, and its mathematical process is established. The three-dimensional transient temperature field in the process of synchronous powder feeding laser cladding is studied and verified by numerical simulation method, and the thin-walled parts formed by later experimental processing are processed by the results of numerical simulation. Using the simulation results of temperature field as the basis for optimizing the processing parameters, the forming path of thin-walled parts is programmed and optimized, and the experimental verification shows the reliability of this method.

scholarly journals Расчетно-экспериментальное исследование ударно-волнового нагружения оптически прозрачных тел

2019 ◽  
Vol 89 (9) ◽  
pp. 1319
Author(s):  
С.И. Герасимов ◽  
В.А. Кузьмин ◽  
В.А. Кикеев ◽  
Н.А. Трепалов
Keyword(s):  
Numerical Simulation ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Shock Wave Loading ◽  
Wave Loading ◽  
Schlieren Method ◽  
Eulerian Formulation ◽  
Background Oriented Schlieren Method ◽  
Background Oriented Schlieren ◽  
Explicit Solver

The results of computational and experimental studies of shock-wave loading of transparent bodies by two methods are presented: theoretical --- based numerical simulation on a regular three-dimensional grid using an explicit solver in a coherent Lagrangian-Eulerian formulation, experimental - - - using the method of shadow photography and background oriented schlieren method.

scholarly journals Axial Crushing Behavior of Aluminum Square Tube with Origami Pattern

2016 ◽  
Vol 10 (2) ◽  
pp. 90 ◽  
Author(s):  
Prescilla Christy Albert ◽  
Amir Radzi Ab Ghani ◽  
Mohd Zaid Othman ◽  
Ahmad Mujahid Ahmad Zaidi
Keyword(s):  
Numerical Simulation ◽  
Energy Absorption ◽  
Testing Machine ◽  
Axial Crushing ◽  
Geometrical Shapes ◽  
Thin Walled Tube ◽  
Absorption Performance ◽  
Thin Walled ◽  
Crushing Behavior ◽  
Aluminum Alloy 6063

<span style="font-size: 10pt; font-family: 'Times New Roman','serif'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;" lang="EN-US">The study of axial crushing behavior is important in designing crashworthy structures especially in automotive applications. The axial crushing of thin-walled tube has better energy absorption capability. Thus, introducing milled geometrical shapes on thin-walled tube may improve the energy absorption performance. The improvement of the crush response is determined through the reduction of the Initial Peak Force (IPF) and the increase of the Specific Energy Absorption (SEA). This was done by employing origami pattern milled on the surface of thin-walled square tube which was investigated experimentally and numerically. The material used for the tube was aluminum alloy 6063-T5. The simulation results were validated by experiments which were conducted using <span style="text-transform: uppercase;">Instron</span> 3382 Universal Testing Machine and <span style="text-transform: uppercase;">Instron Dynatup</span> 8250 Drop Hammer Machine. The numerical simulation then progressed by varying parameters such as dimensions and configurations of the origami pattern on the square tube. ABAQUS finite element (FE) software was used to conduct the numerical simulation. The result of employing the origami square pattern on square tube is expected to improve the crush response by lowering the IPF and increasing the SEA. The obtained results were then compared with the conventional square tube where the origami pattern on square tube enhanced the crush performance.</span>

A Novel Origami Crash Box With Varying Profiles

2013 ◽  
Author(s):  
Jiayao Ma ◽  
Zhong You
Keyword(s):  
Numerical Simulation ◽  
Energy Absorption ◽  
Cross Sections ◽  
Peak Force ◽  
Geometric Imperfection ◽  
Axial Crushing ◽  
Collapse Mode ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Initial Peak

Crash boxes in automobiles are often made from thin-walled tubes. They are designed to absorb energy when subjected to axial crushing. In this paper we present a novel crash box known as the origami crash box. It is produced by pre-folding the surface of a thin-walled tube according to a developable origami pattern. The pre-folded surface serves both as a type of geometric imperfection to lower the initial peak force, and as a mode inducer to trigger a collapse mode that is more efficient in terms of energy absorption. Numerical simulation of quasi-static axial crushing of the origami crash box has shown that a new collapse mode deemed the completed diamond mode can be triggered in tubes with square, rectangular, and polygonal cross sections and tapered shapes, leading to both a substantial gain in overall energy absorption, while at the same time, a reduction in initial peak force.

Preparation and Properties of Thin Walled Copper Tube by a Short Process Method

2010 ◽  
Vol 148-149 ◽  
pp. 732-735
Author(s):  
Bao Long Yuan ◽  
Zi Dong Wang ◽  
Xiang Ming Li ◽  
Chun Jing Wu
Keyword(s):  
Cooling Water ◽  
Solidification Structure ◽  
Copper Tube ◽  
Water Volume ◽  
Columnar Crystal ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Quality Surface ◽  
Process Method

Thin walled copper tube is prepared in vacuum melting and argon protecting continuous unidirectional solidification equipment by a short process method. The size of the thin walled copper tube is ф39×1.8 mm. The effect of process parameters on the solidification structure and the surface quality of the thin walled copper tube is investigated. The mechanical properties and electrical properties are tested and analyzed. The results show that the thin walled tube with columnar crystal structure and good quality surface can be obtained continuously and stably under the most appropriate process of the melting temperature is between 1423K and 1453K, the cooling water volume is 0.2～0.5m3•h-1, the cooling distance is 50mm, the drawing speed is not higher 20m•h-1. The elongation can reach 60%, and conductivity can reach 102.6%IACS.

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