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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 
    • Rahul Ponginan

      ユーザーフォーラムについて   10/22/17

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Found 13 results

  1. Dear Forum users, The AFDEX predictions of a chevron crack which occurs during the extrusion process is presented and the results are compared with experiments for validation. Cheers from Support Team !
  2. Hello Forum users, An automatic multi-stage precision cold forging process of a yoke was simulated with emphasis on springback phenomenon using an elastoplastic finite element method. The results are discussed below. Figure 1. Yoke to be studied (cold forging) Figure 2. Process design and simulation result of the 6-stage cold forging process Figure 3. Returning process of the punch in Stage 5 – Contours of nodal velocity shown in the picture Figure 4. Measurement of distances between measuring points at ears before and after the punch returning process It was observed that the AFDEX predictions deviated from the experiment values by 16% in this example. Cheers from AFDEX Support Team !
  3. Hello, is it possible to define a new material in AFDEX? If I have a special purpose material, what is the data required and how can I do it?
  4. Hello dear forum visitors, AFDEX 3D can read AFDEX 2D results files either directly or by means of a simple connecting program, and thus 2D and 3D combined simulations can easily be carried out. Of course, the 2D results can be viewed by the 3D post-processor with more powerful graphics functions. Figure 1. shows the predictions of a five-stage precision cold forging process involving one piercing stage and a final three-dimensional stage, obtained by using the 2D and 3D combined simulation capability with minimum user intervention (i.e., with only an initial run and one connection run). Figure 1: 2D and 3D combined simulation - AFDEX It should be noted that this capability is especially efficient for fastener forming process simulation. The 2D and 3D combined simulation is strongly recommended for enhancing computational time, solution reliability, and engineering productivity when relatively few stages are three-dimensional. So it's time to use your resources smartly. Cheers from AFDEX Support team!
  5. Hello everyone, The figures below compare the AFDEX predictions and experiments of a bevel gear manufacturing process composed of an enclosed die forging stage and a consecutive sizing stage. As this is a representative process in near-net shape manufacturing, a precision simulation is required. Figure 1: Process 1 - Enclosed Die Forging Figure 2: Process 2 - Sizing Figure 3: Enclosed Die Forging - Comparison Figure 4: Sizing - Comparison Cheers from AFDEX Support Team!
  6. Damage Models in AFDEX

    Damage models play a decisive role in predicting the fracture phenomena that occur during metal forming or material testing. They may be classified into many categories based on energy, pore-growth micromechanics, porous material and continuum-damage mechanics. AFDEX supports the following damage models as shown in Figure 1 in the current version. 1. Cockroft & Latham Normalized 2. McClintock 3. Brozzo, Deluca & Rendina 4. Oyane, Okimoto & Shima 5. Rice & Tracey 6. Freundenthal Figure 1: Damage models in AFDEX For predicting the crack propagation, AFDEX uses an improved node-splitting technique in the quadrilateral mesh system. Figure 2 shows the history of the fracture formation made using the Brozzo et. Al damage model. It can be observed that the early crack propagates horizontally up to two thirds of the radius of the material. The crack growth is then finalized in the inclined direction. Figure 2: History of fracture formation by the Brozzo et al. damage model A detailed view of the fracture surfaces predicted using different damage models is presented in Figure 3. Figure 3: Detailed view of Fracture surfaces All the major damage models predicted acceptable solutions in terms of the slope of the tensile load drop in the fracture region. It can be observed from Figure 4 that the Freudenthal damage model came closest to the experiments. Figure 4: Load vs. Elongation curve based comparison For more details, reading the literature in the link below is recommended. http://msjoun.gnu.ac.kr/pub/paper/2014/Evaluation of Damage.pdf Cheers from AFDEX Support Team !
  7. AFDEX Logo Simulation

    Hello dear Forum users, Below is an interesting simulation result of our AFDEX logo using AFDEX. Cheers from Support team.
  8. Hello Everyone, We saw different file types and their meaning in previous posts and the usage of the batch file to execute a simulation. As promised earlier, here is a post that demonstrates how to execute multiple simulations simultaneously. Step 1: Save the simulation files in the same folder. Do not run them Step 2: "Edit" all the ".bat" files as shown in the figure. Step 3: The highlighted first line in every batch file is very important. These lines need to be pasted on a new batch file for simultaneous execution. Step 4: Make a copy of one of the existing ".bat" files like shown in the figure. Step 5: Enter the lines from batch files into the new notepad as shown in the picture. Step 6: Double Click the new batch file to execute the simulations. Let us know what you think and feel free to ask questions if you have any. Cheers from AFDEX Support Team!
  9. Hello everyone, Let’s assume you have the process design and all the relevant parameters to simulate. So you open a new project in AFDEX, import geometry and define all other simulation factors. This creates .prj, .scf, .sif, .slf and .bat files. Don’t get worried about the new terms. Just have a look at my earlier post (File Types in AFDEX) to get yourselves acquainted. Like any Job Control Language, batch files (.bat) give us the freedom to write our own script so that we can automate the task of running simulations. So after the process definition is over in AFDEX, you can also double click and execute the .bat file to run the simulation. This trick will be very useful if you must execute multiple simulations simultaneously. Please keep following our forum. The next post would probably have an example showing the usage of .bat file to execute multiple simulations in this manner. Following is an example of a effective strain contour from a plate forging simulation executed from the .bat file. Please feel free to ask if you have any questions. Cheers! AFDEX Support Team
  10. List of nodal values

    Hello everyone, The list of values of state variables like effective stress or effective strain from a metal forming simulation using AFDEX can be easily obtained from the results folder. 1.Navigate to the simulation results folder 2.Open the “element_value.txt” file to view the effective strain and damage values of elements 3.Open the “”node_value.txt” file to view the effective stress and the principal stress values Let us know what you think and feel free to ask questions if you have any. Cheers from AFDEX Support Team!
  11. Using the Probe Command - AFDEX

    Hello people, This post is about using the "Probe" command in AFDEX to directly pick the nodes of interest from the screen and know the values of state variables like Effective Stress, Effective Strain etc. 1.Open the simulation result file (Format: .a2dsrf for 2D and .a3dsrf for 3D, refer AFDEX File types for details) and select the parameter whose value needs to be probed from the post-processor window. In this example, effective stress is selected. 2. Click the "Probe" command from the tool window and select the node of interest. The probed value is displayed on the lower bottom of the screen. Let us know what you think and feel free to ask questions if you have any. Cheers from AFDEX Support Team!
  12. File types in AFDEX

    Any simulation carried out using AFDEX will consist of 5 different files, a simulation addressing file, two input files, and two output files. Files for addressing a simulation: The SimuLation addressing File(.SLF) contains information about the data files needed for carrying out an analysis. Format: .a2dslf and .a3dslf for a 2d and 3d simulation respectively Example: example1.a2dslf Input Files: The Simulation Control File (.SCF) contains the information needed for simulation control and is subject to change during execution. Format: .a2dscf and .a3dscf for a 2d and 3d simulation respectively Example: example1.a2dscf The Simulation Input File (.SIF) is about the workpiece, die geometry and relevant process information like friction, die velocity etc. In most cases, the user will be not be required to edit anything in this file as all the requirements will be satisfied in the GUI. Format: .a2dsif and .a3dsif for a 2d and 3d simulation respectively Example: example1.a2dsif Output Files: The Simulation Result File (.SRF) saves the input data, FE Solutions, and the process conditions. This file cannot be read by the user directly and can be accessed through the post-processor. Format: .a2dsrf and .a3dsrf for a 2d and 3d simulation respectively Example: example1.a2dsrf The Simulation Print File (.SPF) records the simulation history or the total procedure. The error information is also recorded. Format: .a2dspf and .a3dspf for a 2d and 3d simulation respectively Example: example1.a2dspf Note that a .PRJ file is generated by the preprocessor and functionally it is similar to the SLF. Working on the feedback from users over the time, AFDEX GUI has and is being improved continually to minimize the user intervention as much as possible and make the simulation procedure simple. The file types discussed above will come into play only when advanced forging processes are simulated. For the majority of applications, the user can simulate directly using the GUI. Let us know what you think and feel free to ask questions if you have any. Cheers from AFDEX Support Team!
  13. Hello Everyone, we would like to start the first post in this topic by introducing AFDEX and the different modules that are available. AFDEX is an intelligent metal forming simulator with inbuilt intelligent re-meshing technology.With more than two decades of experience in metal forming simulation, AFDEX serves to be the best fit for design and verification of the forging process with its powerful analytical capability and user-friendly visualization of metal deformation and flow. There are 5 different modules in AFDEX as follows. AFDEX 2D - For Axis-symmetric, plane strain or plane stress problems AFDEX 3D - For 3 Dimensional Problems AFDEX 2d_Die - Die Structural analysis module in 2D AFDEX 3d_Die - Die Structural analysis module in 3D AFDEX MAT - The material identification module Attached is a document which will guide you in choosing the different modules. Let us know what you think and please post your doubts/queries if you have any. We look forward to a wonderful experience in this forum. Cheers from AFDEX Support Team! Choosing Modules_AFDEX V16R01.pdf
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