Special Issue "Modelling and Simulation of Sheet Metal Forming Processes"

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 31 October 2018

Special Issue Editors

Guest Editor
Prof. Marta Oliveira

Department of Mechnical Engineering, University Coimbra, CEMUC, Pinhal Marrocos, P-3030788 Coimbra, Portugal
Website | E-Mail
Interests: applied and computational mechanics; numerical simulation of the sheet metal forming process; modelling of metallic sheets constitutive behavior; mechanical modelling and numerical simulation of contact with friction problems; optimization techniques and algorithms
Guest Editor
Prof. José Valdemar Fernandes

Department of Mechnical Engineering, University Coimbra, CEMUC, Pinhal Marrocos, P-3030788 Coimbra, Portugal
Website | E-Mail
Interests: plastic deformation of metals and alloys (hardening, anisotropy, modelling, inverse analysis and applications to sheet metal forming)

Special Issue Information

Dear Colleagues,

In the mid-1970s, B. Budiansky expressed his dream: “I imagined a black box—a black computation box that was incredibly powerful and into which we could feed a mathematical description of what the stylists envisioned for a certain sheet metal shape. Then push a button and the computer spits out the die shape, the blank configuration needed, the draw beads and their orientation and configuration. If it is not possible, it tells us that too! […]. Even if it is possible, perhaps that's not enough information, and so the computer will give us the probability of success, if we have fed in variabilities in thicknesses, moduli, shapes of stress-strain relations, and so on.” (in: Mechanics of Sheet Metal—Material Behavior and Deformation Analysis, Koistinen and Wang , Eds., Plenum Press, 1978).

This challenge involves continuous developments in different areas, such as: (i) constitutive modelling, including hardening, anisotropy and damage; (ii) friction modelling; (iii) failure criteria; (iv) strategies for parameters identification of constitutive, friction and failure models; (v) numerical models for description of the contact with friction conditions, including deformable tools; (vi) numerical strategies for the analysis of multistep sheet metal forming processes; (vii) optimization procedures combined with numerical simulation, to define forming process parameters;  (viii) numerical simulation combined with statistical analysis tools; and (ix) application to novel sheet metal forming processes and materials, such as warm forming and multi-layer sheets.

The aim of this Special Issue is to collect full papers, communications and reviews, about modeling and numerical simulation of sheet metal forming processes, which may contribute to bridge the gap between dream and virtual reality.

Prof. Marta Oliveira
Prof. José Valdemar Fernandes
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Numerical simulation
  • Modeling
  • Hardening
  • Anisotropy
  • Parameters identification
  • Inverse analysis
  • Damage
  • Mechanical properties
  • Application to sheet metal forming

Published Papers (3 papers)

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Research

Open AccessArticle Predictive Simulation of Plastic Processing of Welded Stainless Steel Pipes
Metals 2018, 8(7), 519; https://doi.org/10.3390/met8070519
Received: 11 June 2018 / Revised: 2 July 2018 / Accepted: 3 July 2018 / Published: 5 July 2018
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Abstract
Metal forming is the most used technique to manufacture complex geometry pieces in the most efficient way, and the technological progress related to the various application fields requires increasingly higher quality standards. In order to achieve such a requirement, people are forced to
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Metal forming is the most used technique to manufacture complex geometry pieces in the most efficient way, and the technological progress related to the various application fields requires increasingly higher quality standards. In order to achieve such a requirement, people are forced to perform quality and compliance tests finalized to guarantee that these standards are met; this often implies a waste of material and economic resources. In the case of welded stainless steel pipes, several critical points affecting the general trend of subsequent machining need to be taken into account. In this framework, the aim of the paper is to study the effects of different process parameters and geometrical characteristics on various members of the stainless steel family during finite elements method (FEM) simulations. The analysis of the simulation outputs, such as stress, strain, and thickness, is reported through mappings, in order to evaluate their variation, caused by the variation of the simulation input parameters. The feasibility of the simulated process is evaluated through the use of forming limit diagrams (FLD). An experimental validation of the model is performed by comparison with real cases. Major parameters that mainly guide the outcome of the simulations are highlighted. Full article
(This article belongs to the Special Issue Modelling and Simulation of Sheet Metal Forming Processes)
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Open AccessArticle Numerical Prediction of Forming Car Body Parts with Emphasis on Springback
Metals 2018, 8(6), 435; https://doi.org/10.3390/met8060435
Received: 27 April 2018 / Revised: 31 May 2018 / Accepted: 6 June 2018 / Published: 8 June 2018
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Abstract
Numerical simulation is an important tool which can be used for designing parts and production processes. Springback prediction, with the use of numerical simulation, is essential for the reduction of tool try-outs through the design of the forming tools with die compensation, therefore,
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Numerical simulation is an important tool which can be used for designing parts and production processes. Springback prediction, with the use of numerical simulation, is essential for the reduction of tool try-outs through the design of the forming tools with die compensation, therefore, increasing the dimensional accuracy of stamped parts and reducing manufacturing costs. In this work, numerical simulation was used for performing the springback analysis of car body stamping made of aluminium alloy AA6451-T4. The finite element analysis (FEM) based software PAM-STAMP 2G was used for performing the forming and springback simulations. These predictions were conducted with various combinations of material models to achieve accurate springback prediction results. Six types of yield functions (Barlat89, Barlat2000, Vegter-Lite, Hill90, Hill48 isotropic, and Hill48 orthotropic) were used in combination with the Voce hardening model. Springback analysis was conducted in three sections of the formed part; the numerical results were compared with the experimental values. It was found that the combinations of Barlat’s yield functions and the Voce hardening law were most accurate in terms of springback prediction. Additionally, it was found that the phenomena that were investigated, which are required for the determination of the kinematic hardening model, such as the change of Young’s modulus E, the transient behaviour, work-hardening stagnation, and permanent softening, were not observed in the aluminium alloy studied. Full article
(This article belongs to the Special Issue Modelling and Simulation of Sheet Metal Forming Processes)
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Open AccessArticle Experimental and Numerical Studies of Sheet Metal Forming with Damage Using Gas Detonation Process
Metals 2017, 7(12), 556; https://doi.org/10.3390/met7120556
Received: 9 November 2017 / Revised: 29 November 2017 / Accepted: 6 December 2017 / Published: 10 December 2017
Cited by 1 | PDF Full-text (4004 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Gas detonation forming is a high-speed forming method, which has the potential to form complex geometries, including sharp angles and undercuts, in a very short process time. Despite many efforts being made to develop detonation forming, many important aspects remain unclear and have
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Gas detonation forming is a high-speed forming method, which has the potential to form complex geometries, including sharp angles and undercuts, in a very short process time. Despite many efforts being made to develop detonation forming, many important aspects remain unclear and have not been studied experimentally, nor numerically in detail, e.g., the ability to produce sharp corners, the effect of peak load on deformation and damage location and its propagation in the workpiece. In the present work, DC04 steel cups were formed using gas detonation forming, and finite element method (FEM) simulations of the cup forming process were performed. The simulations on 3D computational models were carried out with explicit dynamic analysis using the Johnson–Cook material model. The results obtained in the simulations were in good agreement with the experimental observations, e.g., deformed shape and thickness distribution. Moreover, the proposed computational model was capable of predicting the damage initiation and evolution correctly, which was mainly due to the high-pressure magnitude or an initial offset of the workpiece in the experiments. Full article
(This article belongs to the Special Issue Modelling and Simulation of Sheet Metal Forming Processes)
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