Butt Joining of Dissimilar Sheets by Shot Peening

2007 ◽  
Vol 561-565 ◽  
pp. 843-846 ◽  
Author(s):  
Yasunori Harada ◽  
Makoto Fukunaga ◽  
Kenzo Fukaura ◽  
Satoru Ujihashi ◽  
Yuji Kobayashi
Keyword(s):  
Plastic Deformation ◽  
Kinetic Energy ◽  
Plastic Flow ◽  
Shot Peening ◽  
Present Method ◽  
Joint Strength ◽  
Compressed Air ◽  
Processing Conditions ◽  
Large Plastic Deformation ◽  
Notch Geometry

The butt joining of dissimilar sheets using a shot peening process was investigated. Shot peening is a surface treatment and improves the performance of engineering components. In shot peening, the substrate undergoes a large plastic deformation near its surface due to a hit with many shots. Thus, plastic flow characterized by a shear droop occurs at the edge of the substrate due to shot peening. When the dissimilar sheets with the edge of the notch geometry are connected without level difference and shot-peened the connection, the sheets can be joined due to the plastic flow generated by the large plastic deformation during shot peening. In the experiment, a compressed-air-type shot peening machine was employed. The influences of processing conditions on the joining of the dissimilar sheets were examined. The joint strength increased with the kinetic energy of shots. It was found that the present method using shot peening process was effective in joining dissimilar sheets.

Plastic Flow Joining by Shot Peening

2007 ◽  
Vol 340-341 ◽  
pp. 865-870 ◽  
Author(s):  
Yasunori Harada ◽  
Kenzo Fukaura
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Shot Peening ◽  
Thin Sheet ◽  
Dissimilar Materials ◽  
Dissimilar Material ◽  
Processing Temperature ◽  
Processing Conditions ◽  
Large Plastic Deformation ◽  
Hollow Space

In this study, plastic flow joining using a shot peening process was investigated. Surface treatment is necessary to improve the surface properties. Shot peening is one of the surface treatments. Since the surface of substrate is hit repeatedly with a large number of shots, the substrate undergoes a large plastic deformation near its surface. Therefore, plastic flow characterized by a shear droop occurs at the edge of the substrate due to shot peening. If an implant made of a dissimilar material is set in a hollow space on the surface of the substrate and then shot-peened, it can be joined to the substrate due to the peening droop generated by the large plastic deformation during shot peening. In this method, the availability of the plastic flow, i.e., the peening droop makes the joining of the implant possible. In the experiment, a compressed-air-type shot peening machine was employed. To examine experimentally the influence of working temperature on bondability, equipment with a heating furnace was produced. The influence of processing conditions on the joining of the implant and the substrate was examined. The joint strength increased with the kinetic energy of shots and processing temperature. The improved implant with a step was effective in improving in bondability. The dissimilar material was also successfully joined to a thin sheet by using of the interaction of peening droops. It was found that the present method using the peening droop was effective for joining the dissimilar materials.

COLD BUTT JOINING OF LIGHT METAL SHEET BY SHOT PEENING

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6100-6105
Author(s):  
YASUNORI HARADA ◽  
YUJI KOBAYASHI
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Shot Peening ◽  
Light Metal ◽  
Substrate Material ◽  
Metal Sheet ◽  
Fusion Welding ◽  
Dissimilar Material ◽  
Large Plastic Deformation ◽  
Metal Sheets

Aluminum and magnesium materials are very attractive for light weight applications. However, their use is complicated by the fact that dissimilar metals are joined by fusion welding. In the present study, the cold butt joining of light metal sheet with dissimilar material sheet by shot peening was investigated. The shot peening process is widely used to improve the performance of engineering components. In this process the substrate undergoes a large plastic deformation near its surface when hit by many shots. The substrate material close to the surface flows during shot peening. When the dissimilar metal sheets with notched edges are connected without a level difference and then the connection is shot peened, the sheets can be joined by the plastic flow generated by the large plastic deformation during shot peening. In this experiment, an air-type shot peening machine was used. The influences of peening time and shot material on joinability were mainly examined. The joinability was evaluated by tensile test. The joint strength increased with the amount of plastic flow. It was found that the present method can be used to enhance the butt joining of the light metal sheets with the dissimilar material sheets.

Butt Joining of High Strength Steel Sheet and Dissimilar Metal Sheet by Shot Peening

2010 ◽  
Vol 638-642 ◽  
pp. 3667-3672 ◽  
Author(s):  
Yasunori Harada ◽  
Takeshi Uemori
Keyword(s):  
Plastic Deformation ◽  
Shot Peening ◽  
High Strength Steel ◽  
Cast Steel ◽  
High Strength ◽  
Average Diameter ◽  
Large Plastic Deformation ◽  
Dissimilar Metal ◽  
Metal Sheets ◽  
Notch Geometry

In the shot peening process, the substrate undergoes large plastic deformation near the surface due to the hit with many shots. A large plastic deformation characterized by a shear droop occurs at the edge of the substrate. When the dissimilar sheets with the edge of the notch geometry are connected without level difference and then the contact area are shot-peened, the sheets can be joined due to the plastic flow generated by a large plastic deformation during shot peening. This method is similar to joining by caulking. The aim of this paper is to investigate the butt joining of high strength steel and dissimilar metal sheets using a shot peening process. The shot velocity and the coverage were controlled in the experiment. The shots used were made of high carbon cast steel and cemented carbide with an average diameter of 0.1 mm. The sheets were high strength steel and aluminum alloys. The influences of processing conditions on the joinability were mainly examined. The joint strength increased with the kinetic energy of shots. Tensile test was also examined to evaluate bond strength. It was found that the present method can be used to enhance the butt joining of high strength steel and dissimilar metal sheets.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 13. DETERMINATION OF DEFORMED STATE UNDER STRAITENED EXTRUSION IN FOURTH CENTRAL AREA OF PLASTIC DEFORMATION

2020 ◽  
Vol 0 (4) ◽  
pp. 43-51
Author(s):  
A. L. Vorontsov ◽  
◽  
I. A. Nikiforov ◽  
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Central Area ◽  
Direct Extrusion ◽  
Deformed State ◽  
Cumulative Deformation ◽  
The Given ◽  
General Method

Formulae have been obtained that are necessary to calculate cumulative deformation in the process of straitened extrusion in the central area closed to the working end of the counterpunch. The general method of plastic flow proposed by A. L. Vorontsov was used. The obtained formulae allow one to determine the deformed state of a billet in any point of the given area. The formulae should be used to take into account the strengthening of the extruded material.

scholarly journals Understanding large plastic deformation of SiC nanowires at room temperature

2011 ◽  
Vol 95 (6) ◽  
pp. 63003 ◽  
Author(s):  
J. Wang ◽  
C. Lu ◽  
Q. Wang ◽  
P. Xiao ◽  
F. J. Ke ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Room Temperature ◽  
Large Plastic Deformation ◽  
Sic Nanowires

The Force in a Die Forging Hammer

1983 ◽  
Vol 105 (4) ◽  
pp. 270-275 ◽  
Author(s):  
Hans W. Haller
Keyword(s):  
Plastic Deformation ◽  
Energy Balance ◽  
Kinetic Energy ◽  
Theoretical Prediction ◽  
Die Forging ◽  
Upper Limits ◽  
Hammer Forging

The blow of a die forging hammer in its nature and quantity is influenced by the behavior of the forging and its deformation status. In forging, the hammer supplies the energy necessary for plastic deformation as well as the force necessary to coin the forging. The main purpose of this paper is to determine, in hammer forging, how the forces are generated and how the hammer energy is transformed into energies (a) useful for deformation and (b) lost in vibration and noise. Theoretical prediction of the forces is possible by considering the energy balance between the kinetic energy of the ram and the energies used for deformation and lost in rebounding of the ram and the acceleration of the anvil. The results given in this paper show that it is possible to predict at least the upper limits of the generated forces for a given size of an anvil hammer.

Study of the Titanium Alloy Deformation Behavior in Equal Channel Angular Extrusion

2007 ◽  
Vol 345-346 ◽  
pp. 177-180 ◽  
Author(s):  
Dyi Cheng Chen ◽  
Yi Ju Li ◽  
Gow Yi Tzou
Keyword(s):  
Plastic Deformation ◽  
Titanium Alloy ◽  
Deformation Behavior ◽  
Equal Channel Angular Extrusion ◽  
Effective Strain ◽  
Processing Conditions ◽  
Rigid Plastic ◽  
Die Geometry ◽  
Extrusion Processing ◽  
Plastic Deformation Behavior

The shear plastic deformation behavior of a material during equal channel angular (ECA) extrusion is governed primarily by the die geometry, the material properties, and the processing conditions. Using commercial DEFORMTM 2D rigid-plastic finite element code, this study investigates the plastic deformation behavior of Ti-6Al-4V titanium alloy during 1- and 2-turn ECA extrusion processing in dies containing right-angle turns. The simulations investigate the distributions of the billet mesh, effective stress and effective strain under various processing conditions. The respective influences of the channel curvatures in the inner and outer regions of the channel corner are systematically examined. The numerical results provide valuable insights into the shear plastic deformation behavior of Ti-6Al-4V titanium alloy during ECA extrusion.

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