Study of influence of superimposed hydrostatic pressure on bendability of sheet metals

Shahzamanian, M. M.; Lloyd, D. J.; Wu, P.D.; Xu, Zhutian

doi:10.1016/j.euromechsol.2020.104132

Cited by 8 publications

(17 citation statements)

References 32 publications

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“…Damage is very low, close to zero, before necking and it starts to grow when localized deformation happens. As mentioned previously, the effect of pressure on ductility and bendability has been determined in [1,4] using the conventional GTN model when the effect of the shear damage mechanism is not considered. It is explained in [1,4] that the superimposed hydrostatic pressure lowers the stress triaxiality, which retards void growth and increases the fracture strain.…”

Section: Resultsmentioning

confidence: 99%

“…There are several methods of increasing the ductility of metals, such as superimposing hydrostatic pressure [1,2]. In mechanical testing under superimposed hydrostatic pressure, tensile testing of the specimen is carried out in a pressure vessel that applies the desired level of pressure in the load assembly [3].…”

Section: Introductionmentioning

confidence: 99%

“…In mechanical testing under superimposed hydrostatic pressure, tensile testing of the specimen is carried out in a pressure vessel that applies the desired level of pressure in the load assembly [3]. The effect of superimposed hydrostatic pressure has been studied numerically using the conventional Gurson-Tvergaard-Needleman (GTN) model under tension and bending in previous studies [1][2][3][4]. However, in this study, the modified GTN model considering the shear damage growth as an increment in the void volume fraction is used to investigate the effect of superimposed hydrostatic pressure on the shear damage mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of superimposed hydrostatic pressure on the bendability of sheet metals using the GTN model in ABAQUS is investigated in [1]. This study explored how hydrostatic pressure suppresses void growth and leads to an increase in ductility in sheet metals.…”

Section: Introductionmentioning

confidence: 99%

“…It was demonstrated that the application of the soft ductile layer improved the bendability of the base metal. From these two studies [1,28], it is clear that combining finite element methods (FEM) with the GTN model is a useful and successful approach to perform a range of analyses and to understand various effects on the ductility of metals in three-point bending tests.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study about the Influence of Superimposed Hydrostatic Pressure on Shear Damage Mechanism in Sheet Metals

Shahzamanian

Thomsen

Partovi

et al. 2021

Metals

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It is generally accepted that the superimposed hydrostatic pressure increases fracture strain in sheet metal and mode of fracture changes with applying pressure. Void growth is delayed or completely eliminated under pressure and the shear damage mechanism becomes the dominant mode of fracture. In this study, the effect of superimposed hydrostatic pressure on the ductility of sheet metal under tension is investigated using the finite element (FE) method employing the modified Gurson–Tvergaard–Needleman (GTN) model. The shear damage mechanism is considered as an increment in the total void volume fraction and the model is implemented using the VUMAT subroutine in the ABAQUS/Explicit. It is shown that ductility and fracture strain increase significantly by imposing hydrostatic pressure as it suppresses the damage mechanisms of microvoid growth and shear damage. When hydrostatic pressure is applied, it is observed that although the shear damage mechanism is delayed, the shear damage mechanism is dominant over the growth of microvoids. These numerical findings are consistent with those experimental results published in the previous studies about the effect of superimposed hydrostatic pressure on fracture strain. The numerical results clearly show that the dominant mode of failure changes from microvoid growth to shear damage under pressure. Numerical studies in the literature explain the effect of pressure on fracture strain using the conventional GTN model available in the ABAQUS material behavior library when the mode of fracture does not change. However, in this study, the shear modified GTN model is used to understand the effect of pressure on the shear damage mechanism as one of the individual void volume fraction increments and change in mode of fracture is explained numerically.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Study about the Influence of Superimposed Hydrostatic Pressure on Shear Damage Mechanism in Sheet Metals

Shahzamanian

Thomsen

Partovi

et al. 2021

Metals

Self Cite

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Experimental and Numerical Investigation of the Gurson–Tveergard–Needleman Model Parameters for AISI 1045 Steel

Oztekin

Yılmaz

2023

steel research int.

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Void nucleation, void growth, and void coalescence are the stages of ductile fracture. [1] Initial voids present in nondeformed material as a result of previous manufacturing processes like forging, rolling. [2] The initial voids are able to grow in size. Also, new voids are initiated during plastic deformation. All the initial and the initiated voids grow and then coalescence of voids occurs. [3] Second-phase particles, such as inclusions, can also serve as sources of new voids. [4] Ultimately, ductile fracture occurs through the coalescence of voids. [5] Gurson proposes a model for void-related damage in porous domains. [6] Tveergard and Needleman also contribute to the original porous metal plasticity theory. [7,8] Their Gurson-Tveergard-Needleman (GTN) damage model has been widely used to predict ductile deformation and metal fracture. On the other hand, even if widely used to predict ductile deformation characteristics of materials, the GTN model is less effective in predicting damage behavior under low-stress triaxiality, instead under high-stress triaxiality. [9] Also, some studies exist related to low-stress triaxiality for the GTN model. [10,11] The GTN model is preferred for achieving precise modeling of metallic materials that are investigated for their deformation behavior due to their widespread use around the globe. In the literature, researchers have focused on the GTN model in three aspects: parameter identification, model modification, and model usage in applications.Researchers attempt to obtain the parameters using various methodologies such as trial and error, numerical analysis, and advanced experimental techniques. Kahziz et al. examine and identify the steps of void development by in situ X-ray laminography of CT specimens. [12] Another study identifies GTN parameters by artificial neural network and tensile test results. [13] Petit et al. characterize the deformation behavior of 6061 aluminum foam and then validate their results with GTN-based finite element method (FEM) models. [14] Cao et al. study to characterize the ductile damage mechanism of high carbon steel by utilizing X-ray microtomography and mechanical tests. [15] According to the study, void nucleation and void size increase exponentially related to effective plastic strain. Kossakowski studied the GTN model for S235JR steel for spatial stress states. [16] The study by Yuenyong et al. finds void volume fractions with a method called direct potential drop which is performed by correlating void density with the change in the electrical resistance of examined area. [17] Wcislik examines final void volume fractions of fracture surfaces of structural steel with scanning electron microscopy (SEM) images and image processing. [18] Xu et al. develop GTN and Thomson models based on the damage model which consists of size and geometry effects for void development. [19] Ouladbraim et al. utilized GTN model-based tensile test simulations to obtain to necessary data for artificial neural networks. [20]

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The effect of superimposed hydrostatic pressure on shear decohesion in round bar tensile specimens

et al. 2022

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Study of influence of superimposed hydrostatic pressure on bendability of sheet metals

Cited by 8 publications

References 32 publications

Numerical Study about the Influence of Superimposed Hydrostatic Pressure on Shear Damage Mechanism in Sheet Metals

Numerical Study about the Influence of Superimposed Hydrostatic Pressure on Shear Damage Mechanism in Sheet Metals

Experimental and Numerical Investigation of the Gurson–Tveergard–Needleman Model Parameters for AISI 1045 Steel

The effect of superimposed hydrostatic pressure on shear decohesion in round bar tensile specimens

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