Analysis of Material Formability in Incremental Forming

Filice, Luigino; Fratini, Livan; Micari, F.

doi:10.1016/s0007-8506(07)61499-1

Cited by 226 publications

(143 citation statements)

References 4 publications

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“…It was observed that the opening mode of cracks in SPIF is similar to the one present in conventional stamping (mode I in fracture mechanics). The characterization of the stress state within the wall is given assuming plane strain condition (Filice et al, 2002;Jeswiet and Young, 2005). In terms of damage evolution, the decrease of the sheet thickness (or increase of the tool radius) shifts the Mohr circle to the tensile region, thus increasing the hydrostatic stress and the accumulated damage.…”

Section: Damage and Fracture Predictionmentioning

confidence: 99%

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Damage prediction in single point incremental forming using an extended Gurson model

Guzmán

Yuan

Duchêne

et al. 2018

International Journal of Solids and Structures

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Single point incremental forming (SPIF) has several advantages over traditional forming, such as the high formability attainable by the material. Different hypotheses have been proposed to explain this behavior, but there is still no straightforward relation between the particular stress and strain state induced by SPIF and the material degradation leading to localization and fracture. A systematic review of the state of the art about formability and damage in SPIF is presented and an extended Gurson-TvergaardNeedleman (GTN) model was applied to predict damage in SPIF through finite element (FE) simulations. The line test was used to validate the simulations by comparing force and shape predictions with experimental results. To analyze the failure prediction, several simulations of SPIF cones at different wall angles were performed. It is concluded that the GTN model underestimates the failure angle on SPIF due to wrong coalescence modeling. A physically-based Thomason coalescence criterion was then used leading to an improvement on the results by delaying the onset of coalescence.

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Section: Damage and Fracture Predictionmentioning

confidence: 99%

“…SPIF can reach very large levels of deformation, even larger than conventional processes like the hemispherical dome (punch) test (Filice et al, 2002) or deep drawing . The explanation of this behavior has been deeply investigated but a wide spectrum of questions still remain unanswered (Reddy et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Damage prediction in single point incremental forming using an extended Gurson model

Guzmán

Yuan

Duchêne

et al. 2018

International Journal of Solids and Structures

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“…Values are slightly higher than those reported in Figure 4 because they are not exactly extracted at the physical point C or D. Note also that in each case, minor strain do not exceed 4%. To conclude, it is reported that sheet formability decreases with increasing increment step size and tool size [1], but fracture does not occur at the centre of the cross (biaxial stretching conditions) as reported in [11], but for almost uniaxial stretching conditions.…”

Section: Influence Of Increment Step Size and Punch Diametermentioning

confidence: 66%

“…Along the straight line, a pure uniaxial stretching was 11001-p.3 observed. In order to have an area where almost pure biaxial stretching conditions must be achieved, a cross consisting of two perpendicular straight lines was finally formed [11]. A series of 171 pairs of images (171 steps) have been automatically taken before the ductile fracture occurs.…”

Section: Analyses Of a Simple Uniaxial Tool Pathmentioning

confidence: 99%

Single point incremental sheet forming investigated by in-process 3D digital image correlation

Decultot

Robert

Velay

et al. 2010

EPJ Web of Conferences

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Abstract. Single Point Incremental Forming (SPIF) is a promising sheet metal forming process for prototyping and small batches, in which the blank is formed in a stepwise fashion by a displacement-controlled small-sized tool. Due to specific strain paths induced by the process and limited plastic zones in the contact region between the tool and the workpiece, forming diagrams and forming strategies are different from the classical stamping processes. One major limitation of SPIF is the lack of accuracy of the obtained final parts because of the poor knowledge of the state of stress during the process that requires a good description of the material models and a right choice of the process parameters. In this paper, the SPIF process is experimentally investigated by the mean of surface 3D digital image correlation during the forming of a AW-5086-H111 grade aluminium alloy. Development of strain fields encountered in incremental forming is reported and material formability is evaluated on several formed shapes, taking into account a wide range of straining conditions of this process.

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“…The processes involved in incremental forming can be divided into two main groups: the sheet [3][4][5][6][7] and the bulk [8][9][10][11][12] forming methods. Examples of commonly used IF processes are presented in Figure 2 and described in detail in Reference 13.…”

Section: Incremental Formingmentioning

confidence: 99%

Numerical and Experimental Investigation of the Innovatory Incremental-Forming Process Dedicated to the Aerospace Industry

Szyndler

Grosman

Tkocz

et al. 2016

Metall Mater Trans A

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The main goal of this work is development of the incremental-forming (IF) process for manufacturing integral elements applicable to the aerospace industry. A description of the proposed incremental-forming concept based on division of large die into a series of small anvils pressed into the material by a moving roll is presented within this article. A unique laboratory device has been developed to investigate the effects of process parameters on the material flow and the press loads. Additionally, a developed numerical model of this process with specific boundary conditions is also presented and validated to prove its predictive capabilities. However, main attention is placed on development of the process window. Thus, detailed investigation of the process parameters that can influence material behavior during plastic deformation, namely, roll size and roll frequency, is presented. Proper understanding of the material flow to improve the IF process, as well as press prototype, and to increase its technological readiness is the goal of this article. Results in the form of, e.g., strain distribution or recorded forging loads are presented and discussed.

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Analysis of Material Formability in Incremental Forming

Cited by 226 publications

References 4 publications

Damage prediction in single point incremental forming using an extended Gurson model

Damage prediction in single point incremental forming using an extended Gurson model

Single point incremental sheet forming investigated by in-process 3D digital image correlation

Numerical and Experimental Investigation of the Innovatory Incremental-Forming Process Dedicated to the Aerospace Industry

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