Peen forming and stress peen forming of rectangular 2024–T3 aluminium sheets: Curvatures, natural curvatures and residual stresses

Strain ◽  
2021 ◽  
Author(s):  
Pierre A. Faucheux ◽  
Hong Yan Miao ◽  
Martin Lévesque ◽  
Frédérick P. Gosselin
Keyword(s):  
Residual Stresses ◽  
Peen Forming ◽  
Aluminium Sheets

Theoretical Calculation and Numerical Analysis of Residual Stress in Laser Peen Forming of Metal Plate

2011 ◽  
Vol 464 ◽  
pp. 588-591
Author(s):  
Jian Zhong Zhou ◽  
Shu Huang ◽  
J. Sheng ◽  
J.R. Fan ◽  
Z.C. Xu
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Processing Parameters ◽  
Metal Plate ◽  
Plate Bending ◽  
Residual Stress Field ◽  
Bending Deformation ◽  
Peen Forming ◽  
Shock Wave Pressure ◽  
The Moment

Laser peen forming is an emerging novel process of metal plate bending, which uses laser-induced shock wave pressure to generate an unbalanced residual stress field in the target, the moment of the residual stress causes metal plate to develop plastic bending deformation. The mechanism of laser shock induced residual stress was introduced firstly, then the deforming process of metal plate induced by residual stresses was discussed and the depth of the residual compressive stress was proposed. Effects of processing parameters on the residual stress distribution and plate bending deformation were numerical analyzed. The results indicated that the bending deformation of sheet was relative to laser peening numbers, peening coverage and thickness of plate, the magnitude and distribution of residual stresses could be precisely controlled by adjusting laser processing parameters.

Effect of Shot Strip Interval and Shot Times on Laser Shot Peen-Forming with Repetition Laser Pulse

2007 ◽  
Vol 353-358 ◽  
pp. 199-202
Author(s):  
Chao Jun Yang ◽  
Yong Kang Zhang ◽  
Jian Zhong Zhou ◽  
Ming Yong Ni ◽  
Jian Jun Du ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Residual Stresses ◽  
Sheet Metal ◽  
Laser Energy ◽  
Pulse Repetition Frequency ◽  
Laser Shot ◽  
Beam Diameter ◽  
Narrow Strip ◽  
Peen Forming ◽  
Surface Residual Stresses

Laser shot peen-forming of sheet metal(or LasershotSM Peening) is a new plastic forming technique for metallic materials, which uses high-power pulsed laser replacing the tiny balls to peen the surface of sheet metal. When the pressure of shock waves induced by laser impresses an inhomogeneous residual stresses distribution in a given depth on the surface of sheet, it responds to the stress by elongating at the peened surface and effectively bending the sheet. In order to investigate the mechanism of laser shot peen-forming, the narrow strip peen-forming experimental of aluminum alloy 6061-T6 was carried out by using a pulsed Nd:glass laser with 0.5Hz repetition-rate. Here, under some given laser energy, laser pulse width, laser beam diameter and pulse repetition frequency and so on, the influence of shot strip interval and shot times on surface residual stresses and the deformation of the sheet is analyzed. The results show that the bending forming of the sheet metal can be found, and the peened surface of sheet metal becomes convex. That the bending increases with shot strip interval increase is not obvious, but it increases with the shot times increase in a proper range of shot times. Besides, because laser shot peen-forming generates compressive residual stresses on the surface, it offers many desirable characteristics in shaped metals and is a valuable technique for producing components for a range of industries.

Investigation on the Effect of Thickness to Sheet Metal Treated by Laser Peen Forming

2011 ◽  
Vol 464 ◽  
pp. 33-37
Author(s):  
Shu Huang ◽  
Jian Zhong Zhou ◽  
X.D. Yang ◽  
Hong Yan Ruan ◽  
Deng Hui Wei ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Sheet Metal ◽  
Bending Moments ◽  
Wave Loading ◽  
Analysis Model ◽  
Theory Analysis ◽  
Peen Forming ◽  
Sheet Bending ◽  
Laser Shock Wave ◽  
The Relationship

After the mechanisms of laser peen forming (LPF) were analyzed, the effect of sheet metal’s thickness on LPF was discussed in theory. The analysis model that residual stresses brought sheet bending was established, and the relationship between thickness and arc height of sheet metal was obtained. The process of laser shock wave loading during LPF was modeled, and then the residual stresses and deformation of the peened sheet were simulated by ABAQUS software. The results indicated that LPF use bending moments caused by residual stress to induce deformation, which was agreed with the theory analysis. The curvature of sheet metal induced by LPF decreased as the thickness increased, the arc height formed by bending was inversely proportional to thickness square of sheet metal on the whole. This research also has significance for the control of LPF and the investigation of further experiment

Theoretical Study on the Bending Deformation of Metal Plate Induced by Repetitive Laser Shot Peening

2008 ◽  
Vol 375-376 ◽  
pp. 57-61 ◽  
Author(s):  
Jian Zhong Zhou ◽  
Shu Huang ◽  
Xia Ji ◽  
Jian Jun Du ◽  
Chao Jun Yang ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Residual Stress ◽  
Residual Stresses ◽  
Theoretical Study ◽  
Pulsed Laser ◽  
Metal Plate ◽  
Analysis Model ◽  
Peen Forming ◽  
Bending Mechanism ◽  
Pulsed Laser Beam

The laser peen forming (LPF) uses high-power pulsed laser beam replacing the tiny medium balls to peen the surface of plate and generate compressive stress near the surface, the metals respond to this residual stresses by elongating at the peened surface and effectively bend the overall shape. In this paper, the deforming process of metal plate induced by repetitive pulsed laser was discussed from theory firstly, and the bending mechanism of LPF was investigated. Then a mathematical model of bending curvature concerning the depth of residual stress was presented, the influence of residual stresses on the deformation of plate was analyzed. Lastly, the line-track-peening experiment for SUS 304 plate was carried out to evaluate the reasonability of the theoretical analysis model.

scholarly journals The influence of residual stresses on laser beam welding processes of aluminium sheets

Procedia CIRP ◽  
2020 ◽  
Vol 94 ◽  
pp. 713-717
Author(s):  
Christian Hagenlocher ◽  
Jonas Wagner ◽  
Johannes Michel ◽  
Rudolf Weber ◽  
Maximilian Bachmann ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Laser Beam ◽  
Laser Beam Welding ◽  
Aluminium Sheets ◽  
Welding Processes

Method to evaluate residual stresses in the laser cutting process

2002 ◽  
Vol 12 (1) ◽  
pp. 27-41 ◽  
Author(s):  
Y. Zamachtchikov ◽  
F. Breaban ◽  
P. Vantomme ◽  
A. Deffontaine
Keyword(s):  
Residual Stresses ◽  
Laser Cutting ◽  
Cutting Process

Prediction of residual stresses and springback after bending of a textured aluminium plate

2003 ◽  
Vol 105 ◽  
pp. 175-182 ◽  
Author(s):  
L. Delannay ◽  
R. E. Logé ◽  
Y. Chastel ◽  
P. Van Houtte
Keyword(s):  
Residual Stresses

Theoretical study of the prestressing strand's stress by computer modeling methods

2020 ◽  
Vol 76 (11) ◽  
pp. 1139-1148
Author(s):  
A. G. Korchunov ◽  
E. M. Medvedeva ◽  
E. M. Golubchik
Keyword(s):  
Residual Stresses ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Steel Microstructure ◽  
Compressive Stresses ◽  
Wide Range ◽  
Prestressing Strands ◽  
Increasing Temperature ◽  
Wire Strand

The modern construction industry widely uses reinforced concrete structures, where high-strength prestressing strands are used. Key parameters determining strength and relaxation resistance are a steel microstructure and internal stresses. The aim of the work was a computer research of a stage-by-stage formation of internal stresses during production of prestressing strands of structure 1х7(1+6), 12.5 mm diameter, 1770 MPa strength grade, made of pearlitic steel, as well as study of various modes of mechanical and thermal treatment (MTT) influence on their distribution. To study the effect of every strand manufacturing operation on internal stresses of its wires, the authors developed three models: stranding and reducing a 7-wire strand; straightening of a laid strand, stranding and MTT of a 7-wire strand. It was shown that absolute values of residual stresses and their distribution in a wire used for strands of a specified structure significantly influence performance properties of strands. The use of MTT makes it possible to control in a wide range a redistribution of residual stresses in steel resulting from drawing and strand laying processes. It was established that during drawing of up to 80% degree, compressive stresses of 1100-1200 MPa degree are generated in the central layers of wire. The residual stresses on the wire surface accounted for 450-500 MPa and were tension in nature. The tension within a range of 70 kN to 82 kN combined with a temperature range of 360-380°С contributes to a two-fold decrease in residual stresses both in the central and surface layers of wire. When increasing temperature up to 400°С and maintaining the tension, it is possible to achieve maximum balance of residual stresses. Stranding stresses, whose high values entail failure of lay length and geometry of the studied strand may be fully eliminated only at tension of 82 kN and temperature of 400°С. Otherwise, stranding stresses result in opening of strands.

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