Evaluation of Pneumatic Bulge Test Experiments and Corresponding Numerical Forming Simulations

Due to new material concepts (e.g. boron-manganese steels), hot stamping of sheet metal parts has emerged in order to produce high strength components. Thereby, the design of hot stamping processes by means of finite element simulations requires information about the thermo-mechanical material behaviour up to high strain levels at various temperatures as simulation input. It is known that hot tensile tests are only evaluable until low strain levels. Therefore, a hot gas bulge test for temperatures in the range of 600 °C to 900 °C and strain rates up to 1/s is being developed. In order to design such a hot gas bulge test, the requirements (e.g. forming pressure) are estimated by finite element simulations. The result is a test bench, which already enables a pneumatic forming of specimens at room temperature and pressures up to 200 bar without any unexpected side effects.

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Characterisation of the mechanical behaviour and the forming limits of metal foils using a pneumatic bulge test

International Journal of Material Forming ◽

10.1007/s12289-009-0608-4 ◽

2009 ◽

Vol 2 (S1) ◽

pp. 605-608 ◽

Cited By ~ 4

Author(s):

A. Diehl ◽

U. Vierzigmann ◽

U. Engel

Keyword(s):

Mechanical Behaviour ◽

Bulge Test ◽

Forming Limits ◽

Metal Foils ◽

Pneumatic Bulge Test

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Entwicklung eines Hochtemperatur-Bulgetests*/Development of a high-temperature bulge test – Enhanced material testing for hot sheet metal forming

wt Werkstattstechnik online ◽

10.37544/1436-4980-2019-01-02-102 ◽

2019 ◽

Vol 109 (01-02) ◽

pp. 100-104

Author(s):

A. Braun ◽

G. Matthiesen ◽

G. Hirt

Keyword(s):

Automotive Industry ◽

Metal Forming ◽

Hot Stamping ◽

High Strength ◽

Material Testing ◽

Bulge Test ◽

Complex Geometries ◽

Efficient Design ◽

Forming Simulations ◽

Cost Efficient

Das Presshärten von Stahl ermöglicht der Automobilindustrie die Herstellung von hochfesten Bauteilen mit vergleichsweise komplexen Geometrien. Vor allem crashrelevante Bauteile werden häufig pressgehärtet. Durch Umformsimulationen können Presshärteprozesse schnell und kostengünstig ausgelegt werden, wenn genaue Materialdaten vorliegen. Daher wurde im Rahmen des IGF-Projekts 19229 N ein Bulgetest entwickelt, welcher eine Materialprüfung unter den Bedingungen des Presshärtens ermöglicht.   Hot-stamping of steel enables the automotive industry to produce high-strength components featuring complex geometries. Especially crash relevant components are often hot-stamped. While forming simulations enable the exact and cost-efficient design of hot-stamping processes, they require exact material data. Therefore, a bulge test has been developed within the IGF project 19229 N, which enables material testing under hot-stamping conditions.

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Design of a semi-physical dynamic model for a pneumatic bulge test using local model networks trained with FEM data

2018 Global Fluid Power Society PhD Symposium (GFPS) ◽

10.1109/gfps.2018.8472362 ◽

2018 ◽

Author(s):

Gunnar Matthiesen ◽

Alexander Braun ◽

Olivier Reinertz ◽

Katharina Schmitz

Keyword(s):

Dynamic Model ◽

Local Model ◽

Bulge Test ◽

Local Model Networks ◽

Pneumatic Bulge Test ◽

Model Networks

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THE FACTORS AFFECTING THE PROFILE OF MIDDLE BULGE REGION DURING TUBE BULGE TEST

ACTA METALLURGICA SINICA ◽

10.3724/sp.j.1037.2010.00729 ◽

2010 ◽

Vol 46 (6) ◽

pp. 729-735 ◽

Cited By ~ 5

Author(s):

Yanli LIN ◽

Zhubin HE ◽

Shijian YUAN

Keyword(s):

Bulge Test ◽

Factors Affecting ◽

Bulge Region

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Estimation of Fracture Toughness JIC by Miniature Specimen Hydraulic Bulge Test

Materials Science Forum ◽

10.4028/www.scientific.net/msf.898.753 ◽

2017 ◽

Vol 898 ◽

pp. 753-757

Author(s):

Le Le Gui ◽

Tong Xu ◽

Bin An Shou ◽

Han Kui Wang ◽

Jing Xiang

Keyword(s):

Fracture Toughness ◽

Fracture Energy ◽

Fracture Strain ◽

Bulge Test ◽

Miniature Specimen ◽

Hydraulic Bulge Test ◽

Hydraulic Bulge ◽

Resistance Curves ◽

Miniature Specimens ◽

Load Deflection Curve

The fracture toughness tests and a new miniature specimen technology named hydraulic bulge test (HBT) of 3Cr1Mo1/4V at four service time were carried out. Four J-R resistance curves by single-specimen method with one inch CT specimens were obtained to compute the JIC. Different definitions of equivalent fracture strain according to the section morphologies of HBT testing specimens were compared, and fracture energy of miniature specimens with three different thicknesses (0.4mm, 0.5mm and 0.6mm) were also calculated. Results showed that the typical HBT load-deflection curve can be divided into four sections like SPT curve. Equivalent fracture strain and fracture energy EHB can be chosen as two fracture parameters for the HBT specimen. Ductile fracture toughness JIC can be related approximately linearly to both the equivalent fracture strain and fracture energy EHB.

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