Sheet Metal Forming Processes

Constitutive Modelling and Numerical Simulation

verfasst von: Dorel Banabic

Verlag: Springer Berlin Heidelberg

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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Über dieses Buch

The concept of virtual manufacturing has been developed in order to increase the industrial performances, being one of the most ef cient ways of reducing the m- ufacturing times and improving the quality of the products. Numerical simulation of metal forming processes, as a component of the virtual manufacturing process, has a very important contribution to the reduction of the lead time. The nite element method is currently the most widely used numerical procedure for s- ulating sheet metal forming processes. The accuracy of the simulation programs used in industry is in uenced by the constitutive models and the forming limit curves models incorporated in their structure. From the above discussion, we can distinguish a very strong connection between virtual manufacturing as a general concept, ?nite element method as a numerical analysis instrument and constitutive laws,aswellas forming limit curves as a speci city of the sheet metal forming processes. Consequently, the material modeling is strategic when models of reality have to be built. The book gives a synthetic presentation of the research performed in the eld of sheet metal forming simulation during more than 20 years by the members of three international teams: the Research Centre on Sheet Metal Forming—CERTETA (Technical University of Cluj-Napoca, Romania); AutoForm Company from Zürich, Switzerland and VOLVO automotive company from Sweden. The rst chapter presents an overview of different Finite Element (FE) formu- tions used for sheet metal forming simulation, now and in the past.

Inhaltsverzeichnis

Frontmatter

Chapter 1. FE-Models of the Sheet Metal Forming Processes

Abstract

In the current section an overview of different Finite Element (FE) formulations used for sheet metal forming simulation, now and in the past, will be given. The theories of FE-simulation of large deformation problems will be briefly touched upon herein, but for thorough presentations the reader is referred to the many existing text books on the subject, e.g. Belytschko et al. [1], Zienkiewicz and Taylor [2] and Crisfield [3]. The object is rather to give a general understanding of the advantages and disadvantages of the various methods in use. Review articles on sheet forming simulation and comparative studies of different FE-procedures are found in e.g. Honecker and Mattiasson [4], Oñate and Agelet de Saracibar [5], Oñate et al. [6], Mattiasson [7], Kawka et al. [8], Wenner [9], Wang et al. [10], Mattiasson [11], Makinouchi [12] and Wenner [13]. State-of-the-art articles on the utilization of sheet forming simulation today, and outlooks against the future are given in Banabic and Tekkaya [14] and Roll and Weigand [15].

Dorel Banabic

Chapter 2. Plastic Behaviour of Sheet Metal

Abstract

In the Sect. 2.8 the summation convention over repeated indices is used. Let A denote second-order tensor and B a forth-order tensor. One can define the double contracted tensor product as \({\textbf{A}}:{\textbf{A}} = A_{ij} A_{ij}\) and \(({\textbf{B}}:{\textbf{A}})_{ij} = B_{ijkl} A_{kl}\). The norm of A is \(\left\| {\textbf{A}} \right\| = \sqrt {{\textbf{A}}:{\textbf{A}}}\) and its direction is \({\textbf{n}} = {{\textbf{A}} \mathord{\left/ {\vphantom {{\textbf{A}} {\left\| {\textbf{A}} \right\|}}} \right. \kern-\nulldelimiterspace} {\left\| {\textbf{A}} \right\|}}\). The time derivative is \({\boldsymbol{\dot A}} = {{d{\textbf{A}}} \mathord{\left/ {\vphantom {{d{\textbf{A}}} {dt}}} \right. \kern-\nulldelimiterspace} {dt}}\).

Dorel Banabic

Chapter 3. Formability of Sheet Metals

Abstract

The formability is the capability of sheet metal to undergo plastic deformation to a given shape without defects. The defects have to be considered separately for the fundamental sheet metal forming procedures of deep-drawing and stretching. The difference between these types of stamping procedures is based on the mechanics of the forming process. For deep-drawing, the usual defects of the produced parts are presented in Fig. 3.1.

Dorel Banabic

Chapter 4. Numerical Simulation of the Sheet Metal Forming Processes

Abstract

Much attention is given to the theoretical and technological methods behind stamping simulation models; however the applicability of these models in the productive completion of a comprehensive digital process plan is often overlooked. The role that simulation models play in the development process must consider the alignment of software usage, the available inputs, and the desired outputs supporting the work process, in addition to the software capabilities.

Dorel Banabic

Backmatter

Titel: Sheet Metal Forming Processes
verfasst von: Dorel Banabic
Verlag: Springer Berlin Heidelberg
Electronic ISBN: 978-3-540-88113-1
Print ISBN: 978-3-540-88112-4
DOI: https://doi.org/10.1007/978-3-540-88113-1

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