Sheet Metal Forming Research in Japan

1966 ◽  
Vol 88 (1) ◽  
pp. 101-110 ◽  
Author(s):  
S. Fukui ◽  
K. Yoshida ◽  
S. Kobayashi
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
High Strain ◽  
High Energy ◽  
Stress And Strain ◽  
Strain Rates ◽  
High Strain Rates ◽  
Press Forming ◽  
Flange Forming

Research activities and their results on sheet metal forming in Japan are introduced with emphasis on the mechanics of sheet metal press-forming. Based on the governing deformation mechanisms and the characteristics of forming limits, sheet metal press-forming processes are classified into deep drawing, bulging, stretch flange forming, and bending. According to this classification, formability and its testing can systematically be evaluated with the aid of the analysis of process mechanics. For the stress and strain analyses, the method of calculation is well established and the use of a computer reveals the detail stress and strain distributions in the process. A basic problem in high energy rate processes is the mechanical behavior of materials at high strain rates, and the deformation of sheet metals in high-speed tension test is discussed. There are many problems still left for the future. A few of these are the conditions of instability and fracture, the effect of anisotropy, the analysis considering the stress and strain variations in the thickness direction, formabilities, the properties of materials at high strain rates, tool wear, and tool deformations.

scholarly journals Direct observation of the dynamic evolution of precipitates in aluminium alloy 7021 at high strain rates via high energy synchrotron X-rays

2021 ◽  
Vol 205 ◽  
pp. 116532
Author(s):  
W.U. Mirihanage ◽  
J.D. Robson ◽  
S. Mishra ◽  
P. Hidalgo-Manrique ◽  
J. Quinta da Fonseca ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Direct Observation ◽  
High Strain ◽  
High Energy ◽  
Dynamic Evolution ◽  
Strain Rates ◽  
X Rays ◽  
High Strain Rates ◽  
Evolution Of Precipitates

scholarly journals Examples of How Increased Formability through High Strain Rates Can Be Used in Electro-Hydraulic Forming and Electromagnetic Forming Industrial Applications

2021 ◽  
Vol 5 (3) ◽  
pp. 96
Author(s):  
Gilles Avrillaud ◽  
Gilles Mazars ◽  
Elisa Cantergiani ◽  
Fabrice Beguet ◽  
Jean-Paul Cuq-Lelandais ◽  
...  
Keyword(s):  
Metal Forming ◽  
High Strain ◽  
Industrial Applications ◽  
Electromagnetic Forming ◽  
Strain Rates ◽  
High Strain Rates ◽  
Strongly Coupled ◽  
Simulation Tools ◽  
Complex Shapes ◽  
Simulation Results

In order to take up some challenges in metal forming coming from the recent environmental stakes, Electromagnetic Forming and Electro-Hydraulic Forming processes have been developed at the industrial scale, using the advantages of high strain rates. Such progress has been possible in particular thanks to the emergence of strongly coupled simulation tools. In this article, some examples have been selected from some industrial applications in deep forming, postforming, embossing, and complex shapes forming. It shows how in particular, the increase in formability can bring benefits to solve customer issues in the automotive, luxury packaging, aeronautic, and particles accelerator sectors. Some simulation results are presented to explain how this highly dynamic forming occurs for each of these applications.

Development of Apparatus for Evaluation of Wrinkles in Sheet Metal Forming Using Angle Beam Technique

2018 ◽  
Vol 792 ◽  
pp. 185-189
Author(s):  
Yuji Segawa ◽  
Daichi Nishikubo ◽  
Yasuo Marumo ◽  
Tomohiro Nonaka ◽  
Yutaka Sakata
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Ultrasonic Measurement ◽  
Reflection Characteristic ◽  
Electro Discharge Machining ◽  
Press Forming ◽  
New Apparatus ◽  
The Relationship ◽  
Beam Technique

Ultrasonic measurement is used to evaluate wrinkles during sheet metal forming. The authors developed a new apparatus for investigating the relationship between the wrinkles in press forming and the ultrasonic reflection characteristic of an angle beam. The new evaluation apparatus was composed of probe-fixing parts, an upper die, a middle die, and a lower die. A specimen was sandwiched by a pair of dies in the evaluation apparatus. Angle beam probes for transmission and reception were set on the upper die. Specimens in the form of plates having periodic trapezoidal wrinkles were fabricated by electro-discharge machining. In the new evaluation apparatus, the specimen is placed in contact with the die. Wrinkling was found to change the ultrasonic reflection characteristic of an angle beam. The new apparatus can thus be used to evaluate wrinkles using the angle beam technique.

Rate-Dependent Material Parameters of the Combined Isotropic/Kinematic Hardening Model for the TRIP980 Steel Sheet

2016 ◽  
Vol 725 ◽  
pp. 132-137
Author(s):  
Geun Su Joo ◽  
Hoon Huh
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Sheet ◽  
Kinematic Hardening ◽  
Strain Rates ◽  
Rate Condition ◽  
Hardening Model ◽  
Material Parameters ◽  
Rate Dependent

This paper is concerned with rate-dependent hardening behaviors of the TRIP980 steel sheet. In sheet metal forming, sheet metals experiences complicated loading at various strain rates. In order to predict deformed shape in sheet metal forming, accurate material properties and an appropriate constitutive model in numerical simulation are important to consider reverse loading and various strain rates simultaneously.This paper deals with rate-dependent material parameters of the isotropic/kinematic hardening model. Tension/compression tests of the TRIP980 steel sheet are performed with a newly developed experimental technique at various strain rates ranging from 0.001 to 100 s−1. Tension/compression hardening curves of the TRIP980 steel sheet are approximated by the Chun et al model at each strain rate condition respectively. From acquired material parameters, rate dependencies of tension/compression hardening behaviors are investigated.

Research on the Forming Process of the Y-Shaped Tube Based on ABAQUS

2012 ◽  
Vol 602-604 ◽  
pp. 1942-1945
Author(s):  
Ling Yun Zhang ◽  
Ya Lin Pan ◽  
Zhen Jun Li
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Stress And Strain ◽  
Forming Process ◽  
Shaped Tube ◽  
Deformation Ability ◽  
Simulation Results ◽  
Distribution Of Stress ◽  
Abaqus Software

ABAQUS software is used to simulate the stamping process of the Y-shaped tube to study the feasibility of stamping forming. The simulation results are analyzed to study how fabrication holes affect the ability of sheet metal forming. The results show that it is possible to form the Y-shaped tube by stamping; fabrication holes with reasonable size and location can improve the distribution of stress and strain, and enhance the limit deformation ability of the sheet.

scholarly journals Study of extreme states of matter at high energy densities and high strain rates with powerful lasers

Laser Physics ◽  
2016 ◽  
Vol 26 (9) ◽  
pp. 094001 ◽  
Author(s):  
I K Krasyuk ◽  
P P Pashinin ◽  
A Yu Semenov ◽  
K V Khishchenko ◽  
V E Fortov
Keyword(s):  
High Strain ◽  
High Energy ◽  
Strain Rates ◽  
High Strain Rates
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