Prediction of shear-induced fracture in sheet metal forming

Li, Yaning; Luo, Meng; Gerlach, Jörg C.; Wierzbicki, Tomasz

doi:10.1016/j.jmatprotec.2010.06.021

Cited by 226 publications

(75 citation statements)

References 20 publications

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“…The triaxiality factor (k = 0.15) in the FE macro-model was calculated in the failure areas which are located on the inner surface of blood chamber between two connectors (Fig.7a). The reached value of triaxiality factor (k = 0.15) [9] indicates probability of a pure shear-induced-fracture. The boundary conditions are taken from experiment and displacements are equal to values given in Table 1 for sample nr 2.…”

Section: Model Of Micro-shear Test and Resultsmentioning

confidence: 99%

“…The damage models based on key parameters (stress triaxiality and Lode's angle parameter) are the most commonly used for finite element modeling of shear fracture of steels and alloys in different forming processes, for example the modified Mohr-Coulomb fracture criterion was adopted to problems involving ductile fracture of materials and sheets to predict shear fracture in [9]. The results of shear tests are also applied in the multi-scale models as an input data, for example the multi-scale hierarchical constitutive model was developed in [10] for establishing the relationship between quantum mechanical, micro-mechanical, and overall strength/toughness properties in steel design.…”

Section: Introductionmentioning

confidence: 99%

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Numerical And Experimental Analysis Of Fracture Of Athrombogenic Coatings Deposited On Ventricular Assist Device In Micro-Shear Test

Kopernik¹,

Milenin²,

Kąc³

2015

Archives of Metallurgy and Materials

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The Polish left ventricular assist device (LVAD -RELIGA EXT) will be made of thermoplastic polycarbonate-urethane (Bionate II) with deposited athrombogenic nano-coatings: gold (Au) and titanium nitride (TiN). Referring to the physical model, the two-scale model of LVAD developed in the previous works in the authors' finite element code is composed of a macro-model of blood chamber and a micro-model of wall: TiN, Au and Bionate II. The numerical analysis of stress and strain states confirmed the possibility of fracture based on localization of zones of the biggest values of triaxiality factor. The introduction of Au interlayer between TiN and polymer improved the toughness of the connection, and increased the compressive residual stress in the coating what resulted in reduction of stress and strain close to the boundary between substrate and coating.However, the proper design of multilayer wall of the medical device requires the introduction of the real stress and strain states in the deposited coatings. The characteristics of TiN nano-coating such as residual stress, material model and fracture model were determined in the previously completed studies such as experimental and numercial nanoindentation tests, profilometry studies and in situ SEM's micro-tension tests.The experimental in situ SEM's micro-shear test was performed in the present paper and the corresponding numerical model of the test was also developed, and then, interpreted. The critical strains taken from experiment and considered as the effective strains in the model of test are the values which are the function of triaxiality factors for the tested samples. The developed in the authors' FE code model of multilayer wall of VAD enriched with critical strain determined in the present paper enables prediction of fracture.Keywords: micro-shear test, finite element method (FEM), fracture, ventricular assist device (VAD), titanium nitride (TiN), gold (Au) Polska lewa komora wspomagania pracy serca (LVAD -RELIGA EXT) zostanie wykonana z termoplastycznego poliwęgla-no-uretanu (Bionate II) z naniesionymi atrombogennymi powłokami: złota (Au) i azotku tytanu (TiN). W odniesieniu do modelu fizycznego, dwuskalowy model komory LVAD opracowany we wcześniejszych pracach w autorskim kodzie elementów skończonch jest złożony z modelu makro czaszy krwistej i z mikro-modelu ściany: TiN, Au i Bionate II. Analiza numeryczna stanów naprężenia i odkształcenia potwierdziła prawdopodobieństwo pękania poprzez zlokalizowanie stref o największej wartości współczynnika naprężenia trójosiowego. Wprowadzenie międzywarstwy złota pomiędzy TiN i polimer poprawiło wytrzymałość tego połączenia i powiększyło ściskające naprężenie własne w powłoce, co doprowadziło do redukcji naprężenia i odkształcenia blisko granicy pomiędzy podłożem i powłoką.Jednakże, właściwy projekt wielowarstwowej ściany urządzenia medycznego wymaga wprowadzenia rzeczywistych stanów naprężeń i odkształceń w naniesionych powłokach. Charakterystyki powłok TiN takie jak naprężenie własne, model materiału i model pęk...

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Section: Model Of Micro-shear Test and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical And Experimental Analysis Of Fracture Of Athrombogenic Coatings Deposited On Ventricular Assist Device In Micro-Shear Test

Kopernik¹,

Milenin²,

Kąc³

2015

Archives of Metallurgy and Materials

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“…Numerous studies were conducted to characterize the material's behavior after necking [20][21][22][23][24][25][26][27][28][29][30]. We could get some inspiration and reference from those of metal sheets and round bars.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Geometry of Metal Tube Walls after Necking in Uniaxial Tension

Daxin

Zhang

et al. 2017

Metals

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Abstract:In order to characterize the deformation and true stress-strain relation of metal tubes, the geometry of tube walls after necking in uniaxial tension need to be determined. The paper investigated the necking process of metal tube. A large number of tensile tests and finite element analysis of 1Cr18Ni9Ti tubes with different sizes were conducted. It was found that the geometry of outer tube wall in the necking region can be described using a logistic regression model. The final geometry of the tube is determined by original tube diameter and wall thickness. The offset of tube walls are affected by two competing factors: volume constancy and necking. The offset distances of outer and inner walls are mainly affected by original wall thickness. The length of the necking zone is more influenced by original tube diameter. Tube elongation at fracture increases slightly as tube diameter gets larger, while the wall thickness has almost no impact on the elongation.

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“…Björklund et al (2013), or an in-plane shear fracture, see e.g. Li et al (2010). Instabilities arise when the strain hardening can no longer compensate for the reduction in load carrying area.…”

Section: Introductionmentioning

confidence: 99%

Failure characteristics of a dual-phase steel sheet

Björklund

Nilsson

2014

Journal of Materials Processing Technology

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Failure in ductile sheet metal structures is usually caused by one, or a combination of, ductile tensile fractures, ductile shear fractures or localised instability. In this paper the failure characteristics of the high strength steel Docol 600DP are explored. The study includes both experimental and numerical sections. In the experimental sections, the fracture surface of the sheet subjected to Nakajima tests is studied under the microscope with the aim of finding which failure mechanism causes the fracture. In the numerical sections, finite element (FE) simulations have been conducted using solid elements. From these simulations, local stresses and strains have been extracted and analysed with the aim of identifying the fracture dependency of the stress triaxiality and Lode parameter.

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Prediction of shear-induced fracture in sheet metal forming

Cited by 226 publications

References 20 publications

Numerical And Experimental Analysis Of Fracture Of Athrombogenic Coatings Deposited On Ventricular Assist Device In Micro-Shear Test

Numerical And Experimental Analysis Of Fracture Of Athrombogenic Coatings Deposited On Ventricular Assist Device In Micro-Shear Test

Investigation of the Geometry of Metal Tube Walls after Necking in Uniaxial Tension

Failure characteristics of a dual-phase steel sheet

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