A Procedure for the Evaluation of Flow Stress of Sheet Metal by Hydraulic Bulge Test Using Elliptical Dies

2012 ◽  
Vol 504-506 ◽  
pp. 107-112 ◽  
Author(s):  
Lucian Lazarescu ◽  
Ioan Pavel Nicodim ◽  
Dan Sorin Comsa ◽  
Dorel Banabic
Keyword(s):  
Flow Stress ◽  
Sheet Metal ◽  
Equivalent Stress ◽  
Equivalent Strain ◽  
Bulge Test ◽  
Sheet Metals ◽  
Experimental Procedure ◽  
Hydraulic Bulge ◽  
Two Parameters

The paper describes a new experimental procedure for the determination of the curves relating the equivalent stress and equivalent strain of sheet metals by means of the hydraulic bulge tests through elliptical dies. The procedure is based on an analytical model of the bulging process and involves the measurement of only two parameters (pressure acting on the surface of the specimen and polar deflection).

scholarly journals DETERMINATION OF MATERIAL PARAMETERS OF SHEET METALS USING THE HYDRAULIC BULGE TEST

2013 ◽  
Vol 19 (1) ◽  
Author(s):  
Lucian Lăzărescu ◽  
Ioan Nicodim ◽  
Ioan Ciobanu ◽  
Dan Sorin Comşa ◽  
Dorel Banabic
Keyword(s):  
Bulge Test ◽  
Sheet Metals ◽  
Material Parameters ◽  
Hydraulic Bulge Test ◽  
Hydraulic Bulge

A Comparative Study on Hydraulic Bulge Testing and Analysis Methods

2008 ◽  
Author(s):  
Eren Billur ◽  
Muammer Koc¸
Keyword(s):  
Flow Stress ◽  
Optical Measurement ◽  
Measurement Techniques ◽  
Material Behavior ◽  
Biaxial Stress ◽  
Dome Height ◽  
Bulge Test ◽  
Analysis Methods ◽  
Bulge Testing ◽  
Hydraulic Bulge

Hydraulic bulge testing is a material characterization method used as an alternative to tensile testing with the premise of accurately representing the material behavior to higher strain levels (∼70% as appeared to ∼30% in tensile test) in a biaxial stress mode. However, there are some major assumptions (such as continuous hemispherical bulge shape, thinnest point at apex) in hydraulic bulge analyses that lead to uncertainties in the resulting flow stress curves. In this paper, the effect of these assumptions on the accuracy and reliability of flow stress curves is investigated. The goal of this study is to determine the most accurate method for analyzing the data obtained from the bulge testing when continuous and in-line thickness measurement techniques are not available. Specifically, in this study the stress-strain relationships of two different materials (SS201 and Al5754) are obtained based on hydraulic bulge test data using various analysis methods for bulge radius and thickness predictions (e.g., Hill’s, Chakrabarty’s, Panknin’s theories, etc.). The flow stress curves are calculated using pressure and dome height measurements and compared to the actual 3-D strain measurement from a stereo optical and non-contact measurement system ARAMIS. In addition, the flow stress curves obtained from stepwise experiments are compared with the ones from above methods. Our findings indicate that Enikeev’s approach for thickness prediction and Panknin’s approach for bulge radius calculation result in the best agreement with both stepwise experiment results and 3D optical measurement results.

Determination of the flow stress and contact friction of sheet metal in a multi-layered upsetting test

2010 ◽  
Vol 210 (10) ◽  
pp. 1290-1296 ◽  
Author(s):  
S. Coppieters ◽  
P. Lava ◽  
H. Sol ◽  
A. Van Bael ◽  
P. Van Houtte ◽  
...  
Keyword(s):  
Flow Stress ◽  
Sheet Metal ◽  
Contact Friction ◽  
Upsetting Test

Determining the Anisotropy Coefficients of an Ultra Fine Grained Al6082 Alloy Subjected to ECAP

2007 ◽  
Vol 537-538 ◽  
pp. 215-222
Author(s):  
György Krállics ◽  
Arpad Fodor
Keyword(s):  
Constitutive Equation ◽  
Yield Stress ◽  
Continuum Mechanics ◽  
Equivalent Stress ◽  
Strain Curve ◽  
Equivalent Strain ◽  
Rigid Plastic ◽  
Fine Grained ◽  
Anisotropy Coefficients

Bulk Al6082 alloy is subjected to ECAP using route Bc. This paper focuses on the determination of the anisotropy coefficients and equivalent stress-equivalent strain curve using continuum mechanics equations. Assuming the material to be rigid-plastic, the parameters of the constitutive equation are determined with the aid of measuring the deformation and the uniaxial yield stress during upsetting tests in three perpendicular directions.

scholarly journals Determination of Material Strengths by Hydraulic Bulge Test

Materials ◽  
2016 ◽  
Vol 10 (1) ◽  
pp. 23 ◽  
Author(s):  
Hankui Wang ◽  
Tong Xu ◽  
Binan Shou
Keyword(s):  
Bulge Test ◽  
Hydraulic Bulge Test ◽  
Hydraulic Bulge
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