Author
Maria Beatriz Silva
Other affiliations: Technical University of Lisbon, Universidade Nova de Lisboa, University of Lisbon
Bio: Maria Beatriz Silva is an academic researcher from Instituto Superior Técnico. The author has contributed to research in topics: Formability & Sheet metal. The author has an hindex of 20, co-authored 68 publications receiving 1742 citations. Previous affiliations of Maria Beatriz Silva include Technical University of Lisbon & Universidade Nova de Lisboa.
Topics: Formability, Sheet metal, Necking, Forming processes, Fracture (geology)
Papers published on a yearly basis
Papers
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TL;DR: In this article, a closed-form theoretical analysis of the fundamentals of single point incremental forming is presented, which is based on membrane analysis with bi-directional in-plane contact friction and is focused on the extreme modes of deformation that are likely to be found in singlepoint incremental forming processes.
244 citations
TL;DR: In this article, the authors constructed a closed-form analytical model that is capable of dealing with the fundamentals of single-point incremental forming and explaining the experimements of SPIF.
Abstract: In recent work, the present authors constructed a closed‐form analytical model that is capable of dealing with the fundamentals of single‐point incremental forming (SPIF) and explaining the experim...
169 citations
TL;DR: In this article, the authors revisited the forming limit diagram (FLD) in the light of fundamental concepts of plasticity, damage and ductile fracture mechanics and proposed a new experimental methodology to determine the formability limits by fracture in sheet metal forming.
169 citations
TL;DR: In this paper, a new theoretical model for rotational symmetric single point incremental forming (SPIF) was developed under membrane analysis with bi-directional in-plane contact friction forces.
Abstract: Knowledge of the physics behind the fracture of material at the transition between the inclined wall and the corner radius of the sheet is of great importance for understanding the fundamentals of single point incremental forming (SPIF). How the material fractures, what is the state of strain and stress in the small localized deformation zone and how these two subjects are brought together in order to explain the overall formability of SPIF in terms of ductile damage are still not well understood. However, they are of great importance for improving the robustness and enhancing the predictability of currently existing numerical models and for extending the scope of industrial applications of the process. This paper attempts to provide answers to these questions by means of a new theoretical model for rotational symmetric SPIF that was developed under membrane analysis with bi-directional in-plane contact friction forces.
163 citations
TL;DR: In this article, a unified view conciliates the aforementioned different explanations on the role of necking in fracture and is consistent with the experimental observations that have been reported in the past years.
Abstract: The last years saw the development of two different views on how failure develops in single-point incremental forming (SPIF). Today, researchers are split between those claiming that fracture is always preceded by necking and those considering that fracture occurs with suppression of necking. Each of these views is supported by convincing experimental and theoretical arguments that are available in the literature. This paper revisits failure in SPIF and presents a new level of understanding on the influence of process variables such as the tool radius that assists the authors to propose a new unified view on formability limits and development of fracture. The unified view conciliates the aforementioned different explanations on the role of necking in fracture and is consistent with the experimental observations that have been reported in the past years. The work is performed on aluminium AA1050-H111 sheets and involves independent determination of formability limits by necking and fracture using tensile and hydraulic bulge tests in conjunction with SPIF of benchmark shapes under laboratory conditions.
158 citations
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TL;DR: In this article, a closed-form theoretical analysis of the fundamentals of single point incremental forming is presented, which is based on membrane analysis with bi-directional in-plane contact friction and is focused on the extreme modes of deformation that are likely to be found in singlepoint incremental forming processes.
244 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 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
TL;DR: In this article, the authors used a recently developed fracture model combined with finite element analyses to predict the occurrence of fracture in single point incremental forming (SPIF) of two shapes, a cone and a funnel.
181 citations
TL;DR: In this paper, a comprehensive review of widely used forming processes for aluminium alloys, under cold, warm and hot forming conditions, and the material characteristics and equipment used for each process are presented.
177 citations