Finite Element Simulation of Forming, Joining and Strength of Sheet Components

2007 ◽  
Vol 344 ◽  
pp. 21-28 ◽  
Author(s):  
Jean Loup Chenot ◽  
Pierre Olivier Bouchard ◽  
Yvan Chastel ◽  
Elisabeth Massoni
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Finite Element Simulation ◽  
Input Data ◽  
Elastic Limit ◽  
Sheet Forming ◽  
Element Simulation ◽  
Mechanical Fastening ◽  
Local Properties

A 3-D solid finite element simulation of sheet forming processes is briefly discussed. Examples of cold or warm deep-drawing and sheet hydro forming are presented. Sheet work-pieces can be assembled to produce complex components by using different techniques: such as welding or mechanical fastening. They must also be simulated in order to evaluate and optimise the quality of the parts; examples of hemming and of self piercing riveting are described. Structural computation allows us to evaluate the strength of a component and especially the strength of the joining. In the future, more precise optimization of the components will be possible by the transfer of data from the previous stages of sheet forming and joining, to the structural computation code. This input data will be firstly the distribution of residual stresses, the evolution of local properties such as elastic limit, damage and anisotropy. An example of structural computation on a system of two sheets assembled by a single rivet is presented.

On Eccentric Tube Nosing

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
Mahmoud Nemat-Alla
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Design Modification ◽  
Modes Of Failure ◽  
Element Simulation ◽  
Conical Die ◽  
Eccentric Tube ◽  
Different Diameters ◽  
Tube Nosing

Joining two tubes of different diameters has important concerns in many industries and engineering applications. An eccentric reducer is often used in such applications. Therefore, a simple and easy technique for manufacturing an eccentric reducer is of much importance. The simplest technique for producing the eccentric reducers is the tube nosing through eccentric conical dies. In this paper the finite element simulation is used to investigate the eccentric nosing of circular tubes through an eccentric conical die. Simulation is performed to investigate the plastic deformations of the deformed tube and all the possible modes of failure during the eccentric nosing process. Identification of unfavorable modes of failure in the tube nosing process lead to design modification guidelines, design of preform, and the die shape, for the eccentric nosing process. The results obtained confirmed that the modified design of the tube blank not only improves the quality of the nosed-tube product but also reduces nosing load and improves the limiting nosing ratio. Comparison with the experimental results shows that the nosing load and the modes of failure are successfully predicted by the finite element simulation. Also, a preform design for the tube blank that can produce an eccentric reducer with collar end that did not need a trimming process is introduced.

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