scholarly journals Development of a Multiaxial Tube Expansion Testing Machine That Enables the Continuous Measurement of Large-Strain Biaxial Stress-Strain Curves of Sheet Metals

2013 ◽  
Vol 54 (624) ◽  
pp. 57-63 ◽  
Author(s):  
Fuminori SUGAWARA ◽  
Toshihiko KUWABARA
Keyword(s):  
Continuous Measurement ◽  
Large Strain ◽  
Testing Machine ◽  
Biaxial Stress ◽  
Sheet Metals ◽  
Stress Strain ◽  
Tube Expansion

The Biaxial Stress-Strain Curves of Sheet Metals

2010 ◽  
Vol 44-47 ◽  
pp. 2519-2523
Author(s):  
Hai Bo Wang ◽  
Min Wan ◽  
Yu Yan ◽  
Xiang Dong Wu
Keyword(s):  
Transverse Direction ◽  
Biaxial Loading ◽  
Testing Machine ◽  
Rolling Direction ◽  
Biaxial Stress ◽  
Loading Path ◽  
Sheet Metals ◽  
Stress Strain ◽  
Loading Paths ◽  
Loading Ratio

Biaxial tensile tests of 5754O aluminum alloy sheet and B170P1 steel sheet were performed under linear loading paths with cruciform specimens and a biaxial loading testing machine. The stress-strain curves under different loading paths were obtained. It is found that the loading path has a significant influence on the stress-strain curves, i.e., the stress-strain curves vary with the loading path. The stress-strain curves in the rolling direction become higher with the decrease of the loading ratio (the ratio of the load along the rolling direction to that along the transverse direction) from 4:0 to 4:4. Meanwhile the stress-strain curves in the transverse direction become lower with the decrease of the loading ratio from 4:4 to 0:4. Based on Yld2000-2d yield criterion, the experimental phenomena of the two kinds of sheet metals under biaxial tension were explained theoretically.

Integrated Hydraulic Bulge and Forming Limit Testing Method and Apparatus for Sheet Metals

2014 ◽  
Vol 626 ◽  
pp. 171-177 ◽  
Author(s):  
Yan Yo Chen ◽  
Yu Chung Tsai ◽  
Ching Hua Huang
Keyword(s):  
Forming Limit Diagram ◽  
Close Correlation ◽  
Biaxial Stress ◽  
Forming Limit ◽  
Hydraulic Pressure ◽  
Sheet Metals ◽  
Stress Strain ◽  
Testing Method ◽  
Hydraulic Bulge ◽  
Strain Relationship

This paper proposes an integrated hydraulic bulge and forming limit testing method and apparatus for sheet metals. By placing a PU (Polyurethane) plate between molds and uniformly applying hydraulic pressure to sheet metals, a biaxial stress-strain relationship and forming limit diagram (FLD) displaying both left and right sides were acquired using the same apparatus. An uniaxial tension test and traditional drawing test were conducted to compare the results obtained from the proposed hydraulic bulge and forming limit testing methods, respectively. A close correlation between the results of the stress-strain relationship and FLD in both comparisons verified the feasibility and capability of this integrated hydraulic testing method and apparatus for use with sheet metals.

Determination of the Anisotropic Hardening of Sheet Metals at Large Strain from Stretch Bending Test

2016 ◽  
Vol 725 ◽  
pp. 677-682
Author(s):  
Gustavo Capilla ◽  
Hiroshi Hamasaki ◽  
Fusahito Yoshida ◽  
Toshiya Suzuki ◽  
Kazuo Okamura
Keyword(s):  
Large Strain ◽  
Rolling Direction ◽  
High Strength ◽  
Uniaxial Stress ◽  
Bending Test ◽  
Weighting Coefficient ◽  
Large Strains ◽  
Sheet Metals ◽  
Stress Strain ◽  
Stretch Bending

The present study aims to determine stress-strain curves at large strains of sheet metals under the uniaxial stress state by using the in-plane stretch-bending test. The combined Swift-Voce model, which describes the large-strain work-hardening of materials by means of a weighting coefficient μ, was used for FE simulation of the stretch-bending. The coefficient μ was determined by minimizing the difference in punch stroke vs. bending strain responses between the experimental data and the corresponding experimental results. By using this inverse approach, stress-strain curves of two levels of high-strength steel sheets of a precipitation hardening type, 590R and 780R, in three sheet directions (0, 45 and 90o from rolling direction), were determined.

scholarly journals Deep neural network approach to estimate biaxial stress-strain curves of sheet metals

2020 ◽  
Vol 195 ◽  
pp. 108970 ◽  
Author(s):  
Akinori Yamanaka ◽  
Ryunosuke Kamijyo ◽  
Kohta Koenuma ◽  
Ikumu Watanabe ◽  
Toshihiko Kuwabara
Keyword(s):  
Neural Network ◽  
Deep Neural Network ◽  
Biaxial Stress ◽  
Network Approach ◽  
Sheet Metals ◽  
Stress Strain ◽  
Neural Network Approach

Effects of anisotropy and diaphragm size on biaxial stress—strain curves for sheet metals

1981 ◽  
Vol 16 (1) ◽  
pp. 53-57 ◽  
Author(s):  
M Fazli Ilahi
Keyword(s):  
Biaxial Tension ◽  
Diameter Ratio ◽  
Tension Test ◽  
Biaxial Stress ◽  
Sheet Metals ◽  
Stress Strain ◽  
Normal Anisotropy ◽  
Strain Characteristic ◽  
Bending Stresses ◽  
Theoretical Stress

When a circular diaphragm clamped at the edge is deformed by unilateral hydrostatic pressure the pole is under balanced biaxial tension if the absence of edge effects is assumed. The diaphragm test is an excellent way of obtaining the work-hardening characteristics of sheet metals to fairly high strains. Some previous investigators have tried to correlate the experimental and theoretical stress-strain characteristics of the pole of a diaphragm. In this present work 10 in. and 4 in. diameter dies and sheet metals with an average thickness of 0·040 in. have been used. Previous investigators used diaphragms of smaller sizes; but if the thickness—diameter ratio can be kept small the bending stresses will be negligible. All sheet metals are anisotropic and for simplicity anisotropy in the plane is neglected, so that an average R value can be adopted. Hill's theory of yielding and plastic flow for anisotropic materials has been used together with the uniaxial tension test values to predict the stress—strain characteristic at pole. The effects of the diameter of the die and the normal anisotropy of the sheet metals on the stress—strain characteristics at pole are discussed.

scholarly journals 101 Determination of stress-strain curves at large strain of sheet metals

2014 ◽  
Vol 2014.52 (0) ◽  
pp. _101-1_-_101-2_
Author(s):  
Daisuke KANBARA ◽  
Fusahito YOSHIDA ◽  
Hiroki HASEGAWA ◽  
Yuya ISHIMARU ◽  
Hiroshi HAMASAKI
Keyword(s):  
Large Strain ◽  
Sheet Metals ◽  
Stress Strain

Analytical and Experimental Evaluation of the Stress-Strain Curves of Sheet Metals by Hydraulic Bulge Tests

2011 ◽  
Vol 473 ◽  
pp. 352-359 ◽  
Author(s):  
Lucian Lazarescu ◽  
Dan Sorin Comsa ◽  
Dorel Banabic
Keyword(s):  
Experimental Evaluation ◽  
Deformation Process ◽  
Biaxial Stress ◽  
Curvature Radius ◽  
Sheet Metals ◽  
Stress Strain ◽  
Hydraulic Bulge ◽  
Hydraulic Bulging

This paper presents a new methodology for the determination of the biaxial stress – strain curves by hydraulic bulging tests with circular die. In order to validate the methodology, the authors have performed both stepwise and continuous bulging experiments. The pressure, polar height and curvature radius have been measured in different stages of the deformation process or continuously recorded during the test.

Biaxial Stress‐strain Relations for Brick Masonry

1985 ◽  
Vol 111 (5) ◽  
pp. 1085-1100 ◽  
Author(s):  
M. Dhanasekar ◽  
Peter W. Kleeman ◽  
Adrian W. Page
Keyword(s):  
Brick Masonry ◽  
Biaxial Stress ◽  
Stress Strain
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