Development of Partial One-Sided Rubber Bulging Test for Measurement of Forming Limit Strains of Metal Tube

2020 ◽  
Vol 61 (718) ◽  
pp. 219-225
Author(s):  
Hidenori YOSHIMURA ◽  
Kana NAKAHARA ◽  
Masaaki OTSU
Keyword(s):  
Forming Limit ◽  
Metal Tube ◽  
Bulging Test

Prediction of Forming Limit of Dual-Phase 500 Steel Sheets Using the GTN Ductile Damage Model in an Innovative Hydraulic Bulging Test

JOM ◽  
2018 ◽  
Vol 70 (8) ◽  
pp. 1542-1547 ◽  
Author(s):  
Xiao-Lei Cui ◽  
W. W. Zhang ◽  
Zhi-Chao Zhang ◽  
Yi-Zhe Chen ◽  
Peng Lin ◽  
...  
Keyword(s):  
Damage Model ◽  
Ductile Damage ◽  
Forming Limit ◽  
Dual Phase ◽  
Steel Sheets ◽  
Bulging Test ◽  
Hydraulic Bulging

Superplastic Forming Limit and Instability of AZ31B Sheet

2011 ◽  
Vol 686 ◽  
pp. 343-347
Author(s):  
Mei Juan Song ◽  
Ling Yun Wang ◽  
Rao Chuan Liu
Keyword(s):  
Superplastic Deformation ◽  
Tensile Deformation ◽  
Forming Limit Diagram ◽  
Superplastic Forming ◽  
Alloy Sheet ◽  
Forming Limit ◽  
Local Necking ◽  
Bulging Test ◽  
First Time ◽  
Az31b Magnesium Alloy Sheet

The superplastic bulging test of AZ31B magnesium alloy sheet of 0.6mm thick was carried out on Alliance RT/50 tensile machine at 573K and 3.3×10-4S-1. It is found that either in tensile-compressive deformation or in bi-axis tensile deformation, the judgment criterion for local necking of superplastic deformation is dε2=0. The superplastic forming limit diagram(FLD) at 573K and 3.3×10-4S-1 was established for the first time.

scholarly journals Development of Measurement Equipment and Experimental and Numerical Simulation Studies for Warm Forming Limits of High-Strength Steel

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2373
Author(s):  
Qiang Yu ◽  
Jin Liang ◽  
Qiu Li ◽  
Chengyao Li
Keyword(s):  
Test Temperature ◽  
High Strength Steel ◽  
Digital Simulation ◽  
High Strength ◽  
Warm Forming ◽  
Test Method ◽  
Forming Limit ◽  
Measurement Equipment ◽  
Forming Limits ◽  
Bulging Test

This paper describes the research and development of a set of measurement equipment for the warm forming limits of high-strength steel based on the Nakazima bulging test method and the digital image correlation method. The equipment could provide an argon shield and a water-cooling atmosphere, as well as two heating options: heating the specimen, dies, and environment to the test temperature simultaneously or heating the specimen to the test temperature at a higher speed than that for the dies and environment. The equipment was applied to measure the forming limit curves for high-strength DP600 steel at room temperature and at the temperature of 300 °C to verify its performance. The DYNAFORM software was then applied for the digital simulation of the bulging test method. A new limit-strain-fitting method was proposed to eliminate the impact of the distorted grid on the digital simulation process. The change trend of the forming limit curve acquired in the test had sound consistency with the test results.

Superplastic Forming Limit and Instability of AZ31B Sheet

2007 ◽  
Vol 546-549 ◽  
pp. 387-390
Author(s):  
Ling Yun Wang ◽  
Mei Juan Song ◽  
Rao Chuan Liu
Keyword(s):  
Magnesium Alloy ◽  
Superplastic Deformation ◽  
Tensile Deformation ◽  
Superplastic Forming ◽  
Alloy Sheet ◽  
Forming Limit ◽  
Local Necking ◽  
Bulging Test ◽  
First Time ◽  
Az31b Magnesium Alloy Sheet

The superplastic bulging test of AZ31B magnesium alloy sheet of 0.6mm thick was carried out on Alliance RT/50 tensile machine at 573K and 3.3×10 −4 −1 s . It is found that either in tensile-compressive deformation or in bi-axis tensile deformation, the judgment criterion for local necking of superplastic deformation is 0 2 dε = . The superplastic forming limit diagramFLDat 573K and 3.3×10 −4 −1 s was established for the first time.

scholarly journals Local One-Sided Rubber Bulging Test to Measure Various Strain Paths of Metal Tube

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 751
Author(s):  
Hidenori Yoshimura ◽  
Kana Nakahara ◽  
Masaaki Otsu
Keyword(s):  
Strain Path ◽  
Biaxial Tension ◽  
Forming Limit ◽  
Hydraulic Pressure ◽  
Test Machine ◽  
Biaxial Deformation ◽  
Universal Compression ◽  
Simple Tension ◽  
Strain Paths ◽  
Bulging Test

We proposed a local one-sided rubber bulging method of metal tubes to evaluate various strain paths at an aimed portion and measured the forming limit strains of metal tubes at the place of the occurrence of necking under biaxial deformation. Using this method, since rubber is used to give pressure from the inner side of the tube, no sealing mechanisms were necessary unlike during hydraulic pressure bulging. An opening was prepared in front of the die to locally bulge a tube at only the evaluation portion. To change the restriction conditions of the bulged region for biaxial deformation at the opening, a round or square cutout, or a slit was introduced. The test was conducted using a universal compression test machine and simple dies rather than a dedicated machine. Considering the experimental results, it was confirmed that the strain path was varied by changing the position and size of slits and cutouts. Using either a cutout or a slit, the strain path in the side of the metal tubes can be either equi-biaxial tension or simple tension, respectively. Additionally, by changing the size of the cuts or slits, the strain path can be varied.

scholarly journals A numerical approach for the modelling of forming limits in hot incremental forming of AZ31 magnesium alloy

2021 ◽  
Author(s):  
Davide Campanella ◽  
Gianluca Buffa ◽  
Ernesto Lo Valvo ◽  
Livan Fratini
Keyword(s):  
Room Temperature ◽  
Incremental Forming ◽  
Material Model ◽  
Numerical Approach ◽  
Forming Limit ◽  
Material Strength ◽  
Wall Angle ◽  
Analytical Expression ◽  
The Poor ◽  
Specific Material

AbstractMagnesium alloys, because of their good specific material strength, can be considered attractive by different industry fields, as the aerospace and the automotive one. However, their use is limited by the poor formability at room temperature. In this research, a numerical approach is proposed in order to determine an analytical expression of material formability in hot incremental forming processes. The numerical model was developed using the commercial software ABAQUS/Explicit. The Johnson-Cook material model was used, and the model was validated through experimental measurements carried out using the ARAMIS system. Different geometries were considered with temperature varying in a range of 25–400 °C and wall angle in a range of 35–60°. An analytical expression of the fracture forming limit, as a function of temperature, was established and finally tested with a different geometry in order to assess the validity.

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