Sheet Metal Forming Limits

Marciniak, Z.

doi:10.1007/978-1-4613-2880-3_9

Cited by 33 publications

(25 citation statements)

References 8 publications

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“…The methods of calculating and measuring the deformation and the stress were described in several publications by other authors [2][3][4][15][16][17][18][19][20][21][22][23][24][25][26]. Test specimens with dimensions of 130 × 130 mm 2 and with diameter of 80 mm were used for the bulge test.…”

Section: Materials and Methods For Experimental Researchmentioning

confidence: 99%

“…Several authors have tried to clarify the reasons for this localization in their scientific publications (Figure 2). Marciniak [4] defined inner mechanical failures of material as a fundamental reason for the localization of plastic deformation and the subsequent break of the material. which is why there are certain requirements concerning strength and plastic properties imposed on these sheets.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Materials and Methods For Experimental Researchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Research into Plastic Deformation of Double Reduced Sheets

Spišák

Majerníková

Spišáková

et al. 2018

Metals

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“…Historically, effective models to solve the above problem were based on empirical experience combined with elementary qualitative analytical models [3], [4]. With the development of FEM and increased computer power which enables to solve nonlinear problems effectively, more complicated models were formulated and many phenomena of the leveling process could be investigated computationally.…”

Section: Introductionmentioning

confidence: 99%

A New Model for Fast Analysis of Leveling Process

Petruška

Návrat

Šebek

2012

AMR

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Abstract. The paper deals with numerical analysis of the process of roller leveling of long products. The problem of multiple elastic plastic bending is solved by a program in Matlab, which is based on the Finite Element Method. The aim is to provide a simple, user friendly tool, capable of quick and reliable analysis of the process without the necessity to work with large multipurpose FEM packages. Direct solution of the problem is formulated, starting from the roll intermeshing and product geometry. Roller loading, product deflection, curvature and plastification are the output parameters of the program. With fast and reliable solution of the direct problem, optimal setting of the leveling process will be sought in an iterative process.

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“…If pressure pN rises by value Δp, pN´ rises also by Δp. The increment of pressure is spreading evenly in all directions, because both considered points do not have to be on a common perpendicular [4,5]. …”

mentioning

confidence: 99%

Extrusion in Hydroenvironment in Laboratory Conditions

Moravec

2018

MATEC Web Conf.

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Abstract. The application of liquid environment in forward extrusion is described in this paper. Theoretical part states findings from fluidic mechanics applied in the experimental part. Design solution of the tool is also presented. The experiments were done in laboratory conditions. The findings are stated with their limitations. Theoretical findingsAccording to Figure 1 points N and N´ define the axis of vertical cylinder. Vertical height difference between points N, N´ is h. All pressures perpendicular to the surface, here vertical, form a neutral resultant. The weight ρdSh contained in the cylinder operates in vertical direction, then pressures pN´dS and pN dS. First two forces operate down, the third operates up [1,2,3].Liquid in the cylinder is in balance according to: ρdSh + pN´dS -pN dS = 0. When divided by surface element dS, we get: pN = pN´ + ρh. (1) The difference of the specific pressures of two different points inside the liquid equals to the weight of vertical column of liquid, which has a unit of surface as a base and a difference of height contour of both points. The basic law of hydrostatics applies in any values of pressure pN´ a pN in equation (1). If pressure pN rises by value Δp, pN´ rises also by Δp. The increment of pressure is spreading evenly in all directions, because both considered points do not have to be on a common perpendicular [4,5].

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Sheet Metal Forming Limits

Cited by 33 publications

References 8 publications

Research into Plastic Deformation of Double Reduced Sheets

Research into Plastic Deformation of Double Reduced Sheets

A New Model for Fast Analysis of Leveling Process

Extrusion in Hydroenvironment in Laboratory Conditions

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