Analysis of Plastic Deformation of Double Reduced Sheets

Spišák, Emil; Majerníková, Janka; Spišáková, Emília Duľová; Kaščák, Ľuboš

doi:10.1515/ama-2016-0041

Cited by 6 publications

(10 citation statements)

References 15 publications

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“…In his work, he proposed to use explicit formulations of thickness variations and radius curvature at the pole of the bulge, which change the stress–strain behavior. Spišák et al [ 17 ] conducted research on tin-coated TH415CA steel, which is used in the packaging industry. They analyzed the plastic and mechanical properties of this steel under uniaxial and biaxial loading.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Thickness Analysis of TRIP Steel under Various Degrees of Deformation in Bulge Test

et al. 2022

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To design a reliable forming process it is necessary to determine the mechanical and formability properties of the processed material, which are used as input parameters for forming simulations. High-strength steel is irreplaceable as a material for producing the deformation zones of current automobiles. This type of steel can be processed by conventional or unconventional forming methods. In the sheet forming process, the material is usually under uniaxial and biaxial stress. The bulge test is utilized for determination of biaxial stress–strain curves, which are often used as input material data for forming simulations. In this work, numerical simulations of bulge tests using TRIP RAK 40/70 steel were performed to study the impact of yield criteria and hardening laws on the accuracy of thickness prediction of the deformed steel sheet. Additionally, the impact of different solvers and integration schemes on the thickness prediction was tested. Furthermore, the impact of various degrees of deformation (various dome heights) on thickness prediction accuracy was evaluated. Numerical results showed a good correlation with experimental data. When the Hill90 yield criterion was used, the software with implicit solver was more accurate in predicting thickness compared to software with explicit integration scheme, in most cases. In addition, the thickness prediction of parts with lower deformation was more accurate compared to parts with greater deformation (higher dome height).

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Section: Introductionmentioning

confidence: 99%

“…FEA is an established tool for the calculation and analysis of sheet deformation [ 13 , 14 , 15 , 16 ]. The simulation program should be efficient, accurate and easy to use [ 17 , 18 , 19 ]. Work by Majidi et al [ 18 ] was focused on accurate modelling of the superplastic forming process.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Thickness Analysis of TRIP Steel under Various Degrees of Deformation in Bulge Test

et al. 2022

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“…The unloading, while nominally linear elastic for most cases, it can show remarkable departures from an ideal linear law. [1][2][3][4][5] Accurate bending of the steel sheets requires at the design stage of the manufacturing process to consider mechanical and other properties of the sheet material, i.e., elasticity modulus, yield stress, ratio of yield stress to ultimate tensile stress and microstructure of the material [6]. The non-uniform strain state at the section of material which was exposed to bending moment can lead to the creation of residual stress after external load release.…”

Section: Introductionmentioning

confidence: 99%

“…The springback can be measured or expressed as springback coefficient or as springback angle. [6] A general countermeasure against springback is to design forming tools that expect springback compensation, but the compensation amount is a difficult matter even for experienced tool designers and manufacturing practice is still largely based on trial and error. Specific tolerances have to be made in die design so that the final stamping will fulfil the engineer's objective for both appearance and ease of assembly.…”

Section: Introductionmentioning

confidence: 99%

The Springback Prediction of Deep - Drawing Quality Steel used in V - Bending Process

Mulidrán¹,

Spišák²,

Tomáš³

et al. 2019

Acta Mechanica Slov.

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In the sheet metal forming processes, the material, and in this case deep drawing quality steel DC06 exhibits springback effect, which is governed by strain recovery of material after the load removal. In this contribution, numerical simulation of a bending process was performed and compared with experimental data. The springback is related to many parameters like forming conditions, tool geometry and material properties such as sheet thickness, yield stress, work hardening, strain rate sensitivity and elasticity modulus. In this work, the influence of used material parameters is evaluated. The springback effect of V-shaped sheet metal part made of DC06 steel, with a thickness of 0.85 mm was investigated. Bending angle was set to 90°. In the numerical simulation, Hill48 and Barlat yield criterions were used in combination with Ludwik's and Swift's hardening models. Achieved data from the numerical simulations were compared and evaluated with experimental test results.

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“…A considerable part of a measured length of such test specimens was non-deformed ( Figure 1). Fracture of the test specimens made from the very thin sheets occurs through the localization of plastic deformation [4][5][6][7][8][9], most of the time in ways that are presented in the Figure 1. For that reason, this contribution analyses the reasons of the plastic deformation and the consequent fracture of the test specimens from the very thin steel sheets during the uniaxial tensile test and compares the results obtained by the uniaxial tensile test with those obtained by the bulge test.…”

Section: Introductionmentioning

confidence: 99%

Research into Plastic Deformation of Double Reduced Sheets

Spišák

Majerníková

Spišáková

et al. 2018

Metals

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This contribution focuses on examining properties of thin steel sheets, which have been used to produce packages. Thin steel sheets for producing packages have been created with a different method (considering their thickness) than other thin steel sheets, such as sheets for the automobile industry. Steel sheets thinner than circa 0.18 mm are produced with a simple rolling and followed by annealing. Annealing can be completed through a batch process or a continuous process. Steel sheets with a thickness less than 0.13 mm are produced using a second reduction. Taking into account the considerably different strength and plastic properties of the sheets produced with simple rolling and the sheets produced with a second reduction, two types of materials are evaluated and analyzed in this contribution. Examined materials have been produced with different methods: The first material was continuously annealed after being rolled; the second was deformed using a second reduction without any subsequent annealing. Both used materials possess different final properties. The research focused on evaluation of the strength and plastic properties of the packaging sheets during various stress-strain states (uniaxial tensile test and biaxial tensile test-bulge test). The analysis also focused on the factors that led to a lack of inhomogeneity in the plastic deformation, mainly during the uniaxial tensile test causing the localization of the plastic deformation.

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Analysis of Plastic Deformation of Double Reduced Sheets

Cited by 6 publications

References 15 publications

Experimental and Numerical Thickness Analysis of TRIP Steel under Various Degrees of Deformation in Bulge Test

Experimental and Numerical Thickness Analysis of TRIP Steel under Various Degrees of Deformation in Bulge Test

The Springback Prediction of Deep - Drawing Quality Steel used in V - Bending Process

Research into Plastic Deformation of Double Reduced Sheets

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