scholarly journals DFM Synthesis Approach Based on Product-Process Interface Modelling: Application to the Peen Forming Process

2011 ◽  
pp. 265-277
Author(s):  
J. Elgueder ◽  
L. Roucoules ◽  
E. Rouhaud ◽  
F. Cochennec
Keyword(s):  
Forming Process ◽  
Peen Forming ◽  
Modelling Application ◽  
Synthesis Approach

Deformation Rule of 7150 Aluminum Alloy Thick Plate by Pre-Stress Shot Peen Forming

2014 ◽  
Vol 1052 ◽  
pp. 477-481 ◽  
Author(s):  
Ming Tao Wang ◽  
Yuan Song Zeng ◽  
Xue Piao Bai ◽  
Xia Huang
Keyword(s):  
Aluminum Alloy ◽  
Metal Forming ◽  
Thick Plate ◽  
Radius Of Curvature ◽  
Al Alloy ◽  
Forming Process ◽  
Peen Forming ◽  
Metal Forming Process ◽  
Aeronautical Industry ◽  
Different Thickness

Pre-stress shot peen forming is a metal forming process widely used in aeronautical industry. The test parts of 7150 Al alloy of different thickness were pre-stress shot peen formed. The deformation rule of those parts was investigated by means of changing the peening coverage. The results show that the radius of curvature of the parts will enhance gradually with increasing of the plate’s thickness. In addition, enhancing peening coverage could raise the deformation in the case of that the thickness and peening parameters are unchanged. Furthermore, the minimum radius of curvature of the 8mm plate after saturation pre-stress shot peen forming could reach 499mm.

Three-Dimensional Numerical Simulation and Experimental Study of Sheet Metal Bending by Laser Peen Forming

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Yongxiang Hu ◽  
Yefei Han ◽  
Zhenqiang Yao ◽  
Jun Hu
Keyword(s):  
Numerical Model ◽  
Sheet Metal ◽  
Laser Energy ◽  
Three Dimensional ◽  
Target Surface ◽  
Thick Sheet ◽  
Specimen Thickness ◽  
Forming Process ◽  
Form Complex ◽  
Peen Forming

Laser peen forming (LPF) is a purely mechanical forming method achieved through the use of laser energy to form complex shapes or to modify curvatures. It is flexible and independent of tool inaccuracies that result from wear and deflection. Its nonthermal process makes it possible to form without material degradation or even improve them by inducing compressive stress over the target surface. In the present study, a fully three-dimensional numerical model is developed to simulate the forming process of laser peen forming. The simulation procedure is composed of several steps mainly including the shock pressure prediction, the modal analysis, and the forming process calculation. System critical damping is introduced to prevent unnecessary long post-shock residual oscillations and to greatly decrease the solution time for simulation. The bending profiles and angles with different thicknesses are experimentally measured at different scanning lines and scanning velocities to understand the process and validate the numerical model. The calculated bending profiles and angles agree well with the trend of the measured results. But it is found that simulations with the Johnson–Cook model are more consistent, matching the experimental results for the thick sheet metal with a convex bending, while the elastic-perfectly-plastic model produces a better agreement even though with underestimated values for the thinner sheet metal with a concave bending. The reason for this phenomenon is discussed, combining the effects of strain rate and feature size. Both the simulation and the experiments show that a continuous decrease in bending angle from concave to convex is observed with increasing specimen thickness in general. Large bending distortion is easier to induce by generating a concave curvature with LPF, and the angle of bending distortion depends on the number of laser shocks.

scholarly journals Optimization of shot peen forming patterns to achieve complex target shapes the inverse problem

2021 ◽  
Author(s):  
Hong Yan Miao ◽  
Martin levesque ◽  
Frederick Gosselin
Keyword(s):  
Inverse Problem ◽  
Optimization Procedure ◽  
Spherical Shape ◽  
Forming Process ◽  
Peen Forming ◽  
Out Of Plane ◽  
Order Of Magnitude ◽  
Complex Target ◽  
Wing Skin ◽  
Relative Differences

The inverse problem of determining how to shot peen a plate such that it deforms into a desired target shape is a challenge in the peen forming industry. While peening thick plates uniformly on one side results in a spherical shape, with the same curvature in all directions, complex peening patterns are required to form other shapes, such as cylinders and saddles found on fuselages and wing skin panels. In this study, we present an optimization procedure to automatically compute shot peening patterns. This procedure relies on an idealized model of the peen forming process, where the effect of the treatment is modeled by in-plane expansion of the peened areas, and on an off-the-shelf optimization algorithm. For validation purposes, we peen formed three 305 X 305 X 4.9 mm and two 762 X 762 X 4.9mm 2024--T3 aluminium alloy plates into cylindrical and saddle shapes using the same peening treatment. The obtained shapes qualitatively match simulations. For 305 X 305 X 4.9mm plates, the relative differences had the same distribution and were of the same order of magnitude as initial out-of-plane deviations measured on the as-received plates.

Towards Peen Forming Process Automation

Shot Peening ◽  
2006 ◽  
pp. 44-52 ◽  
Author(s):  
Frank Wüstefeld ◽  
Wolfgang Linnemann ◽  
Stefan Kittel
Keyword(s):  
Process Automation ◽  
Forming Process ◽  
Peen Forming

Experimental Investigations of Different Tool Concepts for Rotary Peen Forming

2013 ◽  
Vol 549 ◽  
pp. 53-60 ◽  
Author(s):  
Christoph Russig ◽  
Markus Bambach ◽  
Gerhard Hirt
Keyword(s):  
Surface Quality ◽  
Machine Design ◽  
Experimental Investigations ◽  
Plastic Layer ◽  
Circular Trajectory ◽  
Forming Process ◽  
The Third ◽  
Peen Forming ◽  
Structural Parts ◽  
Localized Plastic Deformation

Rotary Peen Forming (RPF) is a new peen forming process, comparable to Shot Peen Forming (SPF), in which the shot is held by a flexible connection and moved on a circular trajectory. Hence, RPF uses less machine components and therefore offers a compact machine design and a more flexible use than SPF. Just as conventional Shot Peen Forming the RPF process causes localized plastic deformation but involves tangential components which can create shear deformation in the plastic layer. In this paper, three different RPF tool concepts are compared and the applicability of Rotary Peen Forming for the production of slightly curved parts is analyzed. The first design offers a stochastic impact distribution, the second design leads to deterministic impacts. The third one is a further enhancement of the previous designs and combines the advantages of both. In contrast to previous tests a new, stiffer testing setup was used which offers good comparability of the tool concepts. Particularly the forming potential in terms of the realization of high curvatures and the surface quality are investigated. Depending on the tool concept the surface quality differs significantly, but generally RPF allows the forming of curvatures that are commonly used for aerospace structural parts.

Numerical modeling of a wing skin peen forming process

1996 ◽  
Vol 5 (6) ◽  
pp. 753-760 ◽  
Author(s):  
R. D. VanLuchene ◽  
E. J. Cramer
Keyword(s):  
Numerical Modeling ◽  
Forming Process ◽  
Peen Forming ◽  
Wing Skin

S130 Finite Element Simulation of Residual Stress Profiles in Peen Forming Process

2008 ◽  
Vol 23 (2) ◽  
pp. 190-190
Author(s):  
H. Y. Miao ◽  
C. Perron ◽  
M. Lévesque
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Forming Process ◽  
Peen Forming ◽  
Element Simulation ◽  
Stress Profiles

Effect of Shot Peen Forming with Large Balls on Fatigue Resistance of 2024-T351 Aluminum Alloy

2013 ◽  
Vol 816-817 ◽  
pp. 266-270
Author(s):  
Ming Tao Wang ◽  
Yuan Song Zeng ◽  
Jian Qin Shang ◽  
Xia Huang ◽  
Xue Piao Bai
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Resistance ◽  
Shot Peening ◽  
Metal Forming ◽  
Forming Process ◽  
Surface Strengthening ◽  
Peen Forming ◽  
Different Types ◽  
Metal Forming Process ◽  
Aeronautical Industry

Shot peen forming different from shot peening is a metal forming process widely used in aeronautical industry. Different types of tension-tension fatigue specimens after peen forming were tested. The results show that the fatigue life of specimens peen formed with large balls except edges is 35.4% higher than that of unpeened specimens, while the life of the specimens with whole surface peen formed is 23.2% lower than that of the unpeened specimens. In addition, shot peening specimens which have been peen formed as a surface strengthening way can significantly improve the fatigue resistance. Moreover, when the specimen is peen formed except edges, the position of crack source is from the indentation region to subsurface.

A New Tool Concept for Rotary Peen Forming with Defined Impact Positions

2012 ◽  
Vol 504-506 ◽  
pp. 925-930 ◽  
Author(s):  
Christoph Russig ◽  
Markus Bambach ◽  
Gerhard Hirt
Keyword(s):  
Plastic Deformation ◽  
Machine Design ◽  
Plastic Layer ◽  
Circular Trajectory ◽  
Forming Process ◽  
Numerical Investigations ◽  
Process Characteristics ◽  
Peen Forming ◽  
Set Up ◽  
Localized Plastic Deformation

Rotary peen forming (RPF) has been developed as a new peen forming process in which the shot is held by a flexible connection and moved on a circular trajectory (see Fig. 1 below). The main advantage compared to a traditional shot peen forming (SPF) processes is that RPF does not need refeed of shot particles. Hence, RPF offers a compact machine design and a flexible use. The RPF process causes localized plastic deformation just as in traditional shot peen forming but involves tangential components which can create shear deformation in the plastic layer. These tangential components depend on the connection used for the setup. Compared to traditional shot peen forming, RPF shows different process characteristics in terms of coverage and the shape of indentations created on the surface of the workpiece. In this paper, a new tool concept for rotary peen forming is evaluated using experiments and numerical investigations of the process. The set-up uses a spring-attenuator system, which leads to more deterministic impact positions than previously used wire-based impactor concepts.

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