Accurate Evaluation Method for the Hydraulic Bulge Test

J. Mulder; Henk Vegter; Holger Aretz; Ton van den Boogaard

doi:10.4028/www.scientific.net/KEM.554-557.33

Paper Titles

Transient Negative Strain Hardening during Severe Plastic Deformation of Al-30wt%Zn Alloys
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Correlation of Tensile Test Parameters and Bendability of High-Strength Steels
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Formability of Hybrid Aluminum-Magnesium Compounds
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Analysis of the Deformation Behavior of Ti-6Al-4V at Elevated Temperatures
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Accurate Evaluation Method for the Hydraulic Bulge Test
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A Cruciform Shape to Study the Influence of Strain Paths on Forming Limit Curves
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Ductile Failure Modelling in AA5182 Aluminium Alloy Sheet Forming
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Hot Tensile Behavior of Superplastic and Commercial AA5083 Sheets at High Temperature and Strain Rate
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Crystal Plasticity Finite-Element Simulation of Deformation Behavior during Unloading under Compression in Magnesium Alloy Sheet
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 554-557Accurate Evaluation Method for the Hydraulic Bulge...

Accurate Evaluation Method for the Hydraulic Bulge Test

Abstract:

Optical measuring systems provide much more detail on the deformation of the blank in the bulge test than conventional contact height measuring systems. A significant increase in accuracy of the stress-strain curve can be achieved by fitting the surface to more complicated equations than the traditional spherical surface and by considering the local strain data to approximate the curvature for the midplane. In particular an ellipsoid shape is shown to be very accurate in describing the surface of the blank. Contact height measuring systems provide insufficient data to fit a surface to an ellipsoid shape and to establish local strain data. Pragmatic equations are proposed using the work hardening coefficient from the tensile test to approximate the same accuracy in stress-strain curves as obtained by optical measuring systems using the before mentioned evaluation method.

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Periodical:

Key Engineering Materials (Volumes 554-557)

Pages:

33-40

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.554-557.33

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Cite this paper

Online since:

June 2013

Authors:

J. Mulder, Henk Vegter, Holger Aretz, Ton van den Boogaard

Keywords:

Hydraulic Bulge Test, Stress-Strain Curve

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