Predicting the shape of blanked products: a finite element approach

Brokken, D Dirk; Brekelmans, Wam Marcel; Baaijens, Fpt Frank

doi:10.1016/s0924-0136(00)00418-0

Cited by 47 publications

(35 citation statements)

References 20 publications

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“…However, too frequent remeshing also leads to a loss of accuracy due to transfer errors. A powerful standard quadrilateral mesher is employed, which is capable to deal with complex domains that may result from the presence of cracks [34]. The mesher also allows to define regions with a required higher element density, e.g.…”

Section: Remeshingmentioning

confidence: 99%

Discrete crack modelling of ductile fracture driven by non‐local softening plasticity

Mediavilla

Peerlings

Geers

2006

Numerical Meth Engineering

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SUMMARYA combined approach towards ductile damage and fracture is presented, in the sense that a continuous material degradation is coupled with a discrete crack description for large deformations. Material degradation is modelled by a gradient enhanced damage-hyperelastoplasticity model. It is assumed that failure occurs solely due to plastic straining, which is particularly relevant for shear dominated problems, where the effect of the hydrostatic stress in triggering failure is less important. The gradient enhancement eliminates pathological localization effects which would normally result from the damage influence. Discrete cracks appear in the final stage of local material failure, when the damage has become critical. The rate and the direction of crack propagation depend on the evolution of the damage field variable, which in turn depends on the type of loading. In a large strain finite element framework, remeshing allows to incorporate the changing crack geometry and prevents severe element distortion. Attention is focused on the robustness of the computations, where the transfer of variables, which is needed after each remeshing, plays a crucial role. Numerical examples are shown and comparisons are made with published experimental results.

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Section: Remeshingmentioning

confidence: 99%

Discrete crack modelling of ductile fracture driven by non‐local softening plasticity

Mediavilla

Peerlings

Geers

2006

Numerical Meth Engineering

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“…Moreover, burrs initiate cracks during some stamping operation like flanging. So as to improve the cut-surface quality much experimental research and many numerical simulations have been carried out [4][5][6][7][8][9][10][11][12][13][14]. They have been aimed at determining such parameters as: cutting speed, clearance, tool geometry etc.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Fine Blanking Process of Sheet Titanium

Adamus¹,

Lacki²,

Więckowski³

2011

Archives of Metallurgy and Materials

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The present study has been undertaken in order to investigate the new possibilities of improvement in quality of the cut-surface of titanium blanks. For the intended purpose, a number of numerical simulations of the blanking process were carried out.Fine blanking is one of the most often used methods of finished product manufacturing. Application of blanking with reduced clearance or blanking with material upsetting by V-ring indenter allows for obtaining the high quality cut-surface which does not need further machining. Application of the finite element method (FEM) for numerical simulations allows for effective analysis of the fine blanking processes.In the paper the results of numerical simulation of fine blanking for a disk made of Grade 2 sheet titanium have been presented. The calculations were carried out using ADINA System v. 8.6 based on FEM. Determination of the effect of clearance between cutting edges, and presence and location of V-ring indenter on the stress and strain distribution in shearing zone was the main goal of the work. The numerical simulations showed the effect of tool geometry on a course of blanking process and consequently on the quality and shape of the cut-surface. Based on the numerical simulation it is only possible to deduce the cut-surface appearance, thus the numerical simulations should be completed with experimental tests.Keywords: fine blanking, sheet titanium, numerical modelling Niniejsza praca została wykonana w celu zbadania nowych możliwości poprawy jakości powierzchni przecięcia wykrojek tytanowych. W tym celu wykonano szereg symulacji numerycznych procesu wykrawania.Wykrawanie dokładne jest najczęściej stosowaną metodą otrzymywania wyrobów gotowych. Zastosowanie wykrawania ze zmniejszonym luzem lub wykrawania ze spęczaniem za pomocą klinowej grani pozwala na otrzymanie wysokiej jakości powierzchni przecięcia, która nie wymaga dalszej obróbki mechanicznej. Wykorzystanie w symulacjach numerycznych metody elementów skończonych (MES) pozwala na efektywną analizę procesów wykrawania dokładnego.W artykule zaprezentowano wyniki symulacji numerycznej wykrawania dokładnego krążka z blachy tytanowej Grade 2. Obliczenia wykonano przy użyciu programu ADINA System v. 8.6 opartego na MES. Głównym celem pracy było określenie wpływu luzu pomiędzy krawędziami tnącymi oraz obecności klinowej grani na dociskaczu na rozkład naprężeń i odkształceń w obszarze cięcia. Obliczenia numeryczne wykazały wpływ geometrii narzędzi na przebieg procesu wykrawania, a tym samym na jakość i kształt powierzchni przecięcia. Opierając się na symulacjach numerycznych można jedynie wnioskować o wyglądzie powierzchni przecięcia, dlatego symulacje numeryczne powinny być uzupełnione badaniami doświadczalnymi.

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“…The influence of superposed hydrostatic pressure on ductile fracture initiation was studied by Goijaerts et al and proposed a new model that is valid for both tensile tests and blanking [10]. The split arbitrary Lagrange-Euler method combined with remeshing for large, localized deformation of an elastic-plastic finite-element analysis (FEA) model of the blanking process was studied by Brokken et al [11]. Their findings demonstrate the handling capability of the finite element approach based on the arbitrary Lagrange-Euler method combined with remeshing for the large, localized deformation.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Values of Critical Ductile Fracture Criteria to Predict Fracture Initiation in Punching Processes

Myint

Hagihara

Tanaka

et al. 2017

JMMP

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Punching processes are widely used for producing automobile parts, mechanical components, and other parts. To produce highly accurate parts, it is important to estimate the ratio of the sheared surface to the cut surface. Many researchers have applied the finite-element method (FEM) to analyze the ratio of the sheared surface to the fracture surface on cut surfaces by using ductile fracture criteria. However, it is difficult to determine the fracture criteria on the cut surface by tensile tests or bending tests because the punching process involves many complicated steps. In this study, FEM was applied to the punching process to determine the values of critical fracture criteria (C) by using the ductile fracture criteria proposed by Cockcroft and Latham, Oyane, and Ayada. The ductile fracture criteria were compared with the boundary between the shear surface and the fracture surfaces using experiments performed with a simple punching system. The values of the ductile fracture criteria for the fracture initiation of the formed cut surface were predicted under various clearances between the punch and the die with various punch diameters. The influence of stress triaxiality and the effect of punch diameter on the sheared surface length are also discussed.

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Predicting the shape of blanked products: a finite element approach

Cited by 47 publications

References 20 publications

Discrete crack modelling of ductile fracture driven by non‐local softening plasticity

Discrete crack modelling of ductile fracture driven by non‐local softening plasticity

Numerical Simulation of the Fine Blanking Process of Sheet Titanium

Determination of the Values of Critical Ductile Fracture Criteria to Predict Fracture Initiation in Punching Processes

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