Author
Wilko C. Emmens
Other affiliations: University of Twente
Bio: Wilko C. Emmens is an academic researcher from Tata Steel. The author has contributed to research in topics: Formability & Incremental sheet forming. The author has an hindex of 7, co-authored 21 publications receiving 544 citations. Previous affiliations of Wilko C. Emmens include University of Twente.
Papers
More filters
TL;DR: In this article, the history of Incremental Sheet Forming (ISF) focusing on technological developments is described, and an extensive list of patents including Japanese patents is provided, and the overall conclusion is that ISF has received the attention of the world, in particular of the automotive industry.
233 citations
TL;DR: In this paper, the authors present an overview of mechanisms that have been suggested to explain the enhanced formability of incremental sheet metal forming, including contact stress, bending under tension, shear, cyclic straining, geometrical inability to grow and hydrostatic stress.
222 citations
TL;DR: In this article, the authors applied the CBT test to study aspects of incremental forming and found that the actual bending radius is the most important influencing factor and this turns out to be controlled by both the pulling force and the bending angle.
69 citations
TL;DR: In this paper, the authors discuss the consequences of forming by shear, a situation that is sometimes claimed to occur in incremental forming, and the determination of the principal strains and principal directions is discussed in detail.
Abstract: This paper discusses some consequences of forming by shear, a situation that is sometimes claimed to occur in incremental forming. The determination of the principal strains and principal directions is discussed in detail. Two methods are presented: using a circular grid (although simulated on the computer), and by deriving formulae from the theory; both yield identical results. The strains assuming forming by shear are found to be (much) higher than in situations of forming by stretch. This affects notably more fundamental studies on material behaviour in incremental forming. The effects are illustrated using experimental data obtained with pre-stressed material.
41 citations
TL;DR: In this paper, a numerical analysis of the cyclic force-displacement curve of the CBT test is presented and the importance of bending in stabilizing the deformation under tension is demonstrated.
24 citations
Cited by
More filters
TL;DR: In this paper, the deformation mechanism of incremental sheet forming (ISF) is examined experimentally through forming specially prepared copper sheets, and the authors measured the strain distributions through the thickness of the sheets are measured for two configurations of ISF: two-point incremental forming (TPIF) and single point incremental forming(SPIF).
330 citations
TL;DR: In this article, the history of Incremental Sheet Forming (ISF) focusing on technological developments is described, and an extensive list of patents including Japanese patents is provided, and the overall conclusion is that ISF has received the attention of the world, in particular of the automotive industry.
233 citations
TL;DR: In this paper, the authors present an overview of mechanisms that have been suggested to explain the enhanced formability of incremental sheet metal forming, including contact stress, bending under tension, shear, cyclic straining, geometrical inability to grow and hydrostatic stress.
222 citations
TL;DR: This paper reviews existing hybrid processes reported over the past two decades and attempts to propose possible definitions of hybrid processes along with the authors’ classification, followed by discussion of their developments, limitations and future research needs.
Abstract: Today, hybrid manufacturing technology has drawn significant interests from both academia and industry due to the capability to make products in a more efficient and productive way. Although there is no specific consensus on the definition of the term ‘hybrid processes’, researchers have explored a number of approaches to combine different manufacturing processes with the similar objectives of improving surface integrity, increasing material removal rate, reducing tool wear, reducing production time and extending application areas. Thus, hybrid processes open up new opportunities and applications for manufacturing various components which are not able to be produced economically by processes on their own. This review paper starts with the classification of current manufacturing processes based on processes being defined as additive, subtractive, transformative, joining and dividing. Definitions of hybrid processes from other researchers in the literature are then introduced. The major part of this paper reviews existing hybrid processes reported over the past two decades. Finally, this paper attempts to propose possible definitions of hybrid processes along with the authors’ classification, followed by discussion of their developments, limitations and future research needs.
211 citations
TL;DR: In this paper, the authors provide a critical review of the models available today for predicting the material behaviour at both industrial and scientific level, and the tests needed to identify the models' material parameters.
Abstract: The paper deals with the testing and modelling of metals response when subjected to sheet forming operations. The focus is both on the modelling of hardening behaviour and yield criteria and on the description of the sheet metal formability limits. Within this scope, the paper provides a critical review of the models available today for predicting the material behaviour at both industrial and scientific level, and the tests needed to identify the models’ material parameters. The most recent advances in the field are also presented and discussed with particular emphasis on the challenges the sheet metal forming community is now facing.
184 citations