scholarly journals Determination of Frictional Resistances of Deep Drawing Quality Steel Sheets in Bending Under Tension Test

2019 ◽  
Vol 22 (4) ◽  
pp. 12-17
Author(s):  
Tomasz Trzepiecinski ◽  
Hirpa G. Lemu
Keyword(s):  
Deep Drawing ◽  
Tension Test ◽  
Quality Steel ◽  
Steel Sheets ◽  
Bending Under Tension

scholarly journals Influencia de la anisotropia en la formabilidad de acero inoxidable 439

2019 ◽  
pp. 1-8
Author(s):  
Juan Manuel Salgado-Lopez ◽  
José Luis Ojeda-Elizarrarás ◽  
José Trinidad Pérez-Quiroz ◽  
Hector Javier Vergara-Hernández
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Deep Drawing ◽  
Metallographic Analysis ◽  
Quantitative Chemical Analysis ◽  
Normal Anisotropy ◽  
Automotive Components ◽  
Steel Sheets ◽  
R Value

This work shows the influence of the normal anisotropy (“r” value) in the deep drawing of AISI 439 ferritic stainless steel sheets. In order to do so, quantitative chemical analysis, metallographic analysis, tensile mechanical properties, and the determination of the “r” value and the “n” value were carried out in two different AISI 439 steel sheets of two different suppliers. In recent years, this ferritic stainless steel has been applied in a deep drawing process of automotive components. In this way, it must be said that one of these ferritic stainless steel sheets cracked due to exhaustion of formability during deep drawing after few steps. On the other hand, the second ferritic stainless steel sheet showed neither cracking nor other type of defects. The results of the tests, which were carried out in this work, probed that the“r” value has a strong influence on the forming behaviour of ferritic steel during deep drawing. This information is very relevant because the AISI 439 standard does not consider the planar anisotropy or the strain hardening coefficient as relevant for designation, but this type of steel is being applied in many forming operations of different components.

Experimental Determination of Heat Transfer Coefficients for Forming of Stainless Steel Sheets Considering Process Conditions and Deep-Drawing Film

2013 ◽  
Vol 554-557 ◽  
pp. 1501-1508 ◽  
Author(s):  
Philipp Schmid ◽  
Mathias Liewald
Keyword(s):  
Heat Transfer ◽  
Stainless Steel ◽  
Deep Drawing ◽  
Basic Knowledge ◽  
Process Conditions ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Steel Sheets ◽  
Forming Tools

Heat transfer coefficients are playing an important role in forming of metastable stainless steel sheets. Metastable austenitic stainless steels are highly influenced by heating of forming tools due to generation of latent heat during forming process. Strain-induced martensite formation and hence the TRIP-effect is directly coupled with the temperature development within forming tools as well as the temperature induced by heat controlled tools. Measurements of heat development in serial deep drawing processes are showing the need for an accurate determination of heat transfer coefficients considering actual process conditions. Heat transfer coefficients were determined with a simple and easy applicable measurement device for tool materials AMPCO 25 and cold work tool steel EN 1.2379 in combination with aluminum, austenitic EN 1.4301 and ferritic EN 1.4016 stainless steel grades. Special attention was paid to production-related individual influences such as surface conditions, lubrication and deep drawing film. Experiments were accomplished between 1-15 N/mm² showing high influence of intermediate media on heat transfer between forming tool and part and serve as boundary conditions for fully thermo-mechanical coupled forming simulations. A strong influence of deep drawing film, lubrication and surface pressure on heat exchange could be determined and this basic knowledge is seen as mandatory for dimensioning of heat controlled metal forming tools. Finally the experimental determined results are discussed and compared to common heat transfer models and similar experiments from literature.

Tensile Testing of Ultra-Fine Grained Extra Deep Drawing Steel Sheets

2017 ◽  
Vol 4 (2) ◽  
pp. 590-595 ◽  
Author(s):  
R. Pratoori ◽  
T.S. Maddukuri ◽  
A.K. Sannidhi ◽  
Y.P. Singh ◽  
B. Gundepudi ◽  
...  
Keyword(s):  
Deep Drawing ◽  
Tensile Testing ◽  
Fine Grained ◽  
Steel Sheets

scholarly journals Determination of tension strength in the longitudinal and circumferentional direction in glass-polyester composite pipes

2009 ◽  
pp. 155-163 ◽  
Author(s):  
Slavisa Putic ◽  
Marina Stamenovic ◽  
Branislav Bajceta ◽  
Dragana Vitkovic
Keyword(s):  
Mechanical Test ◽  
Glass Fibers ◽  
Tension Test ◽  
Filament Winding ◽  
Test Machine ◽  
Process Industries ◽  
Polyester Composite ◽  
Glass Fiber Reinforcement ◽  
Composite Pipes

Polymer composite pipes with glass fiber reinforcement have today a wide usage in the chemical and process industries. The basic subject of this paper is the determination and distribution of stresses and strains in longitudinal and circumferentional directions of glass-polyester pipes under tension test. Also, the tension strengths in both directions are determined out. Tension test was performed on an electro-mechanical test machine on flat samples and rings obtained by cutting of pipes produced by the method 'Filament winding' with glass fibers reinforcement ?55?. Also, the micromechanical analysis on fracture surfaces was done by SEM, which provided the knowledge about models and mechanisms of fracture on applyed loading.

CHARACTERIZATION OF FLOW CURVES FOR ULTRA-THIN STEEL SHEETS WITH THE IN-PLANE TORSION TEST

2021 ◽  
pp. 1-25
Author(s):  
Fabian Stiebert ◽  
Heinrich Traphöner ◽  
Rickmer Meya ◽  
A. Erman Tekkaya
Keyword(s):  
Sheet Thickness ◽  
High Strength ◽  
Torsion Test ◽  
New Method ◽  
Bulge Test ◽  
Thin Sheets ◽  
Flow Curves ◽  
Steel Sheets

Abstract The in-plane torsion test is a shear test that has already been successfully used to determine flow curves up to high strains for thin sheets with thicknesses between 0.5 mm and 3.0 mm. In the same way as with other shear tests, the formation of wrinkles is a major challenge in determining flow curves with the in-plane torsion test, especially when testing ultra-thin sheets with a thickness between 0.1 mm and 0.5 mm. A new method for suppressing wrinkling is introduced, in which the formation of wrinkles is avoided by arranging and gluing single sheets to multi-layered specimens. The influence of the used adhesive on the determination of flow curves is negligible. The proposed method is used to identify flow curves for two materials, the high strength steel TH620 and the soft steel TS230, used in the packaging industry. The Materials are tested in sheet thicknesses between 0.17 mm and 0.6 mm. The determined equivalent plastic strains for the TH620 with a sheet thickness of 0.20 mm, could be increased from 0.38 (bulge-test) to over 0.8 with the new method by using four-layered specimens.

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