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.

Flow Stress Determination of Steel Tube for Hydroformability Evaluation

2012 ◽  
Vol 622-623 ◽  
pp. 656-660
Author(s):  
P. Boonpuek ◽  
S. Jirathearanat ◽  
N. Depaiwa
Keyword(s):  
Flow Stress ◽  
Analytical Model ◽  
Effective Stress ◽  
Steel Tube ◽  
Bulge Test ◽  
Stress Strain ◽  
Contact Points ◽  
Hydraulic Bulge Test ◽  
Hydraulic Bulge ◽  
Internal Pressures

This study aims to determine flow stress of a steel tube by using hydraulic bulge test. A new proposed analytical model for analyzing bulge shapes of hydroformed tubes is postulated. Bulge test apparatus designed using FEA simulation of hydroforming and STKM 11A steel tubes are used in the hydraulic bulge test. Bulge heights and internal pressures are measured during bulge testing. Tube thicknesses at vertex of a bulge shape are measured by a dial caliper gauge. Bulge curvatures and contact points are measured by taking digital photos of bulge shapes combined with measurement methods in CAD software. Effective stress - strain relationships are obtained from the newly developed analytical model using those measured values. Flow stress curves obtained from the effective stress – strain relationships are compared with those by other researchers and tensile test. Finite element analysis methods are used to conduct simulation of tube hydroforming using the flow stress curves. Predicted internal pressures versus bulge heights and tube thicknesses are compared with experimental results. Verification of the developed analytical model is presented. The flow stress at neck point of formed tube is determined.

Estimation of Fracture Toughness JIC by Miniature Specimen Hydraulic Bulge Test

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.

Hydraulic Bulge Test of Electrodeposited Copper Foil

1999 ◽  
Vol 77 (2) ◽  
pp. 55-59 ◽  
Author(s):  
H. D. Merchant ◽  
M. G. Rozboril
Keyword(s):  
Copper Foil ◽  
Bulge Test ◽  
Hydraulic Bulge Test ◽  
Hydraulic Bulge

scholarly journals Study of the Hydraulic Bulge Test in T-shape Hydroforming Die

2015 ◽  
Vol 19 ◽  
pp. 70-76 ◽  
Author(s):  
Amir Ashrafi ◽  
Khalil Khalili
Keyword(s):  
Bulge Test ◽  
Hydraulic Bulge Test ◽  
Hydraulic Bulge
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