Calibration method of ductile damage model based on hybrid experimental-numerical analysis of uniaxial tensile and hole-expansion tests

Soussi, Hela; Krichen, Abdelkader

doi:10.1016/j.engfracmech.2018.07.014

Cited by 13 publications

(3 citation statements)

References 38 publications

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“…In hole expansion and other sheet forming applications, Lankford's parameters are widely used to calculate these parameters e.g. [26][27][28]. In the present study, anisotropy parameters were calculated according to the yield stress ratios as it seen in the following equations.…”

Section: Plasticity Modelsmentioning

confidence: 99%

Blank thinning predictions of an aluminum alloy in hole expansion process using finite element method

Akşen

Fırat

2021

SN Appl. Sci.

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The main objective of this study is to accurately predict the thinning behavior of AA6016-O aluminum alloy in the hole expansion test. In order to perform this aim, three yield functions, namely isotropic von Mises, quadratic Hill48 and non-quadratic Yld91, are considered and their prediction capabilities are evaluated in this study. Firstly, finite element (FE) model of hole expansion test is created by implicit FE software Marc, then FE simulations are performed with each yield criterion. In order to assess prediction capabilities of these yield criteria, thickness strain distributions along the three directions of the sheet (rolling, diagonal and transversal) and punch force–displacement curves are investigated. The results predicted from FE analyses are compared with experimental results. From the comparisons, it is observed that Yld91 yield criterion could successfully predict the thickness strain distributions along the rolling and transverse directions, whereas the other two criteria could only predict the thickness strain distributions along the diagonal direction. On the other hand, it is determined that punch force–displacement curves predicted from three models are identical and these predictions are overestimated compared to experimental data.

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Section: Plasticity Modelsmentioning

confidence: 99%

Blank thinning predictions of an aluminum alloy in hole expansion process using finite element method

Akşen

Fırat

2021

SN Appl. Sci.

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“…The same below) is widely used in automobile structural parts; however, despite its good performance, the plate also appears to crack in the actual stamping process, which seriously affects the wide application of UHSS. Studies have shown that the main cause of sheet-edge cracking is the predamage defects left over from the cutting process [1,2]. However, UHSS plates usually show an obvious sensitivity to edge cracks; thus, in order to solve the problem of material cracking, researchers have studied the plates cracking from multiple sides.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cutting Process on the Flanging Formability of the Cut Edge for DP980 Steel

Chang

Zhang

Han

et al. 2023

Metals

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Flanging is a key process in the forming of automobile parts and is influenced by the cutting process before it. In this paper, a set of self-designed tools is adopted. The flanging height and flanging radius are specified as the indexes to investigate the influence of the cutting process on the flanging formability of DP980 steel. Microstructure, microhardness, and tensile properties are tested to evaluate the formability of cut edges. The results show that the flanging formability is positively correlated with an increase in flanging height and a decrease in flanging radius. The flanging formability of six cut edges can be ranked as: LC-L > LC-H > WEDM-HS > WEDM-LS > CNC milling > WJC. In the LC process, acicular martensite is formed and the microhardness of the cut edge significantly increases, with a heat-affected zone of about 150 μm. More and larger microvoids are found on the edge of WEDM-LS than WEDM-HS, which reduces the formability to a certain extent. Plastic deformation of the edges is the reason for the decrease in the formability of CNC milling. For WJC, the formation of irregular edge damage and the generation of burrs are the main reasons for the unstable performance. This research is helpful in guiding the selection of the cutting process, and it may contribute to a high part formability for DP980 steel.

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“…In order to investigate sheet flangeability, the hole expansion test, hereafter referred to as hole expansion test (HET), is generally adopted. The HET consists of expanding a hole employing a punch with a conical-tip through a die, aiming to form a flange around the periphery of the hole [3]. The stretch-flangeability of sheet metal can be evaluated by the hole expansion ratio (HER), which is defined according to the ISO 16630:2009 standard [4] and calculated as follows:…”

Section: Introductionmentioning

confidence: 99%

Development of a Device Compatible with Universal Testing Machine to Perform Hole Expansion and Erichsen Cupping Tests

et al. 2019

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The material characterization regarding sheet metal formability is usually assessed by the forming limit curve (FLC). The FLC requires specialized and expensive equipment, several samples with different geometries, and can be a very time-consuming procedure for data treatment. Alternatively, the hole expansion test (HET) and the Erichsen Cupping Test (ECT) can be used for routine evaluations of sheet metal mechanical behavior. These formability tests require fewer quantities of material and easy specimen preparation with a fast analysis of results. The HET and ECT procedures provide a proper evaluation of sheet material stretch-flangeability, formability, strength, and ductility. In this work, we developed a low-cost mechanical device capable of performing the HET and ECT tests using a universal testing machine. The equipment is designed to meet the test parameters set by ISO 16630 (HET) and ISO 20482 (ECT) standards. In order to verify its functionality, tests were carried out with the dual-phase steels DP600 and DP780. The corresponding values determined for the hole expansion ratio and the Erichsen index provided reliable results in terms of the accuracy and repeatability of the proposed testing device.

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Calibration method of ductile damage model based on hybrid experimental-numerical analysis of uniaxial tensile and hole-expansion tests

Cited by 13 publications

References 38 publications

Blank thinning predictions of an aluminum alloy in hole expansion process using finite element method

Blank thinning predictions of an aluminum alloy in hole expansion process using finite element method

Influence of Cutting Process on the Flanging Formability of the Cut Edge for DP980 Steel

Development of a Device Compatible with Universal Testing Machine to Perform Hole Expansion and Erichsen Cupping Tests

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