On the optimization and accuracy of stress-strain curve determination using hydraulic bulge test

2014 ◽  
pp. 769-773
Author(s):  
H Campos ◽  
B Martins ◽  
A Santos ◽  
F Barlat
Keyword(s):  
Strain Curve ◽  
Bulge Test ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Hydraulic Bulge Test ◽  
Hydraulic Bulge ◽  
Curve Determination

Further Investigation of the Hydrostatic Bulge Test in a Plasticity Laboratory

2009 ◽  
Vol 37 (2) ◽  
pp. 159-174
Author(s):  
O. Ifedi ◽  
Q. M. Li ◽  
Y. B. Lu
Keyword(s):  
Tensile Test ◽  
Effective Stress ◽  
Strain Curve ◽  
Plasticity Theory ◽  
Loading Path ◽  
Uniaxial Tensile ◽  
Bulge Test ◽  
Uniaxial Tensile Test ◽  
Stress Strain Curve ◽  
Stress Strain

In plasticity theory, the effective stress–strain curve of a metal is independent of the loading path. The simplest loading path to obtain the effective stress–strain curve is a uniaxial tensile test. In order to demonstrate in a plasticity laboratory that the stress–strain curve is independent of the loading path, the hydrostatic bulge test has been used to provide a balanced biaxial tensile stress state. In our plasticity laboratory we compared several different theories for the hydrostatic bulge test for the determination of the effective stress–strain curve for two representative metals, brass and aluminium alloy. Finite element analysis (FEA) was performed based on the uniaxial tension test data. It was shown that the effective stress–strain curve obtained from the biaxial tensile test (hydrostatic bulge test) had a good correlation with that obtained in the uniaxial tensile test and agreed well with the analytical and FEA results. This paper may be used to support an experimental and numerical laboratory in teaching the concepts of effective stress and strain in plasticity theory.

A Study of Thickness Change of Spherical Cup Made from TRIP Steel after Hydraulic Bulge Test

2014 ◽  
Vol 635 ◽  
pp. 157-160 ◽  
Author(s):  
Emil Spišák ◽  
Janka Majerníková
Keyword(s):  
Trip Steel ◽  
Bulge Test ◽  
Stress Strain ◽  
Thickness Change ◽  
Material Thickness ◽  
Hydraulic Bulge Test ◽  
Hydraulic Bulge

The article deals with the comparison of thickness change of spherical cup made from TRIP steel RAK40/70 after hydraulic bulge test. The thickness has been measured by timing gauge and by apparatus Argus. Experimental material thickness has been 0.75 mm. From measured values of thickness of experimental material has been calculated the dependence stress-strain by models of several authors.

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