Prediction on Residual Stress and Fatigue Life of Magnesium Alloy Treated by Laser Shot Peening

2009 ◽  
Vol 626-627 ◽  
pp. 393-398 ◽  
Author(s):  
Su Qing Jiang ◽  
Jian Zhong Zhou ◽  
Yu Jie Fan ◽  
Shu Huang ◽  
J.F. Zhao
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Magnesium Alloy ◽  
Shot Peening ◽  
Numerical Study ◽  
Processing Parameters ◽  
Laser Shot ◽  
Residual Stress Field ◽  
Alloy Plate ◽  
Fea Model

Numerical study on fatigue life of ZK60 magnesium alloy plate before and after laser shot peening (LSP) was carried out in this paper. Based on the FEA model, residual stress field induced by LSP was analyzed, the fatigue life and position of weak area were predicted with ABAQUS software and MSC.Fatigue code, respectively, and the processing parameters were optimized. The results show that the fatigue life of ZK60 sheet metal by single LSP with one side and both sides increased by 72.9% and 78.5% compared with the untreated sample respectively. The size and depth of compressive residual stress increase with the increment of peening number, but when the peening number gets to a certain value, the residual stress reaches saturation and the fatigue life increase no longer significantly.

Numerical Study on Strengthening Effect of Laser Shot Peening for Wrought Magnesium Alloy

2012 ◽  
Vol 217-219 ◽  
pp. 2234-2237 ◽  
Author(s):  
Su Qin Jiang ◽  
Hong Guang Xu
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Numerical Study ◽  
Back Analysis ◽  
Laser Shot ◽  
Fatigue Properties ◽  
Strengthening Effect ◽  
Fea Model

Based on finite element method, the FEA model used for analyzing fatigue properties of sample treated by laser shot peening (LSP) was established. In order to research the influence of material intensity on LSP effect, two kinds of wrought magnesium alloys AZ31B and ZK60 with different intensity were chosen as object, the compressive residual stress and fatigue life after LSP were analyzed. After spring back analysis the elastic strain is released in material inner, the value of compressive residual stress was reduced; after LSP with 3 times, the fatigue life gains of AZ31B and ZK60 were 105% and 163%, respectively. The results show that strengthening effect of high intensity material treated by LSP is better than that of low intensity material.

Study on the Improvement of Fatigue Crack Growth Performance of 6061-T6 Aluminum Alloy Subject to Laser Shot Peening

2011 ◽  
Vol 464 ◽  
pp. 391-394 ◽  
Author(s):  
Cheng Dong Wang ◽  
Jian Zhong Zhou ◽  
Shu Huang ◽  
X.D. Yang ◽  
Z.C. Xu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Crack Growth ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Compact Tension ◽  
Crack Size ◽  
Laser Shot ◽  
Material Surface ◽  
Residual Stress Field

In order to enhance mechanical property and restrain crack growth of 6061-T6 aluminum alloy, laser shot peening (LSP) was employed to induce compressive residual stress and plastic deformation on the surface of metal. The FEA code ABAQUS and MSC. Fatigue were used to simulate crack growth of Compact tension (CT) specimens treated by LSP. The numerical simulation results showed that LSP can effectively inhibit the crack growth, decrease the crack growth rate as well as increase the final crack size, and as a consequence, fatigue life was extended. Adding peening times could get deeper compressive residual stress field which strengthen material surface and restrain crack growth, but the fatigue stress intensity factor threshold decreases.

scholarly journals Small–Scale Experimental Investigation of Fatigue Performance Improvement of Ship Hatch Corner with Shot Peening Treatments by Considering Residual Stress Relaxation

2021 ◽  
Vol 9 (4) ◽  
pp. 419
Author(s):  
Jin Gan ◽  
Zi’ang Gao ◽  
Yiwen Wang ◽  
Zhou Wang ◽  
Weiguo Wu
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Fatigue Life ◽  
Stress Relaxation ◽  
Stress Field ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Fatigue Performance ◽  
Residual Stress Field ◽  
Residual Stress Relaxation

Ship hatch corner is a common structure in a ship and its fatigue problem has always been one of the focuses in ship engineering due to the long–term high–stress concentration state during the ship’s life. For investigating the fatigue life improvement of the ship hatch corner under different shot peening (SP) treatments, a series of fatigue tests, residual stress and surface topography measurements were conducted for SP specimens. Furthermore, the distributions of the surface residual stress are measured with varying numbers of cyclic loads, investigating the residual stress relaxation during cyclic loading. The results show that no matter which SP process parameters are used, the fatigue lives of the shot–peened ship hatch corner specimens are longer than those at unpeened specimens. The relaxation rate of the residual stress mainly depends on the maximum compressive residual stress (σRSmax) and the depth of the maximum compressive residual stress (δmax). The larger the values of σRSmax and δmax, the slower the relaxation rates of the residual stress field. The results imply that the effect of residual stress field and surface roughness should be considered comprehensively to improve the fatigue life of the ship hatch corner with SP treatment. The increase in peening intensity (PI) within a certain range can increase the depth of the compressive residual stress field (CRSF), so the fatigue performance of the ship hatch corner is improved. Once the PI exceeds a certain value, the surface damage caused by the increase in surface roughness will not be offset by the CRSF and the fatigue life cannot be improved optimally. This research provides an approach of fatigue performance enhancement for ship hatch corners in engineering application.

3D Computational Simulation of Multi-Impact Shot Peening

2012 ◽  
Vol 1485 ◽  
pp. 35-40
Author(s):  
Juan Solórzano-López ◽  
Francisco Alfredo García-Pastor
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Stress Field ◽  
Surface Treatment ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Fatigue Testing ◽  
Computational Simulation ◽  
Target Material ◽  
Residual Stress Field

ABSTRACTShot peening is a widely applied surface treatment in a number of manufacturing processes in several industries including automotive, mechanical and aeronautical. This surface treatment is used with the aim of increasing surface toughness and extending fatigue life. The increased performance during fatigue testing of the peened components is mainly the result of the sub-surface compressive residual stress field resulting from the plastic deformation of the surface layers of the target material, caused by the high-velocity impact of the shot. This compressive residual stress field hinders the propagation and coalescence of cracks during the second stage of fatigue testing, effectively increasing the fatigue life well beyond the expected life of a non-peened component.This paper describes a 3D computational model of spherical projectiles impacting simultaneously upon a flat surface. The multi-impact model was developed in ABAQUS/Explicit using finite element method (FEM) and taking into account controlling parameters such as the velocity of the projectiles, their incidence angle and different impact locations in the target surface. Additionally, a parametric study of the physical properties of the target material was carried out in order to assess the effect of temperature on the residual stress field.The simulation has been able to successfully represent a multi-impact processing scenario, showing the indentation caused by each individual shot, as well as the residual stress field for each impact and the interaction between each one of them. It has been found that there is a beneficial effect on the residual stress field magnitude when shot peening is carried out at a relatively high temperature. The results are discussed in terms of the current shot-peening practice in the local industry and the leading edge developments of new peening technologies. Finally, an improved and affordable processing route to increase the fatigue life of automotive components is suggested.

Numerical Analysis on Fatigue Life of Wrought Magnesium Alloy Treated by Laser Shot Peening

Applied laser ◽  
2012 ◽  
Vol 32 (5) ◽  
pp. 379-383
Author(s):  
蒋素琴 Jiang Suqin ◽  
徐红光 Xu Hongguang ◽  
吴建华 Wu Jianhua ◽  
裴旭 Pei Xu
Keyword(s):  
Fatigue Life ◽  
Numerical Analysis ◽  
Magnesium Alloy ◽  
Shot Peening ◽  
Laser Shot ◽  
Wrought Magnesium Alloy

Residual Stress Field of ZK60 Specimen with Central Hole Induced by Both-Side Laser Shot Peening

2010 ◽  
Vol 37 (7) ◽  
pp. 1850-1855 ◽  
Author(s):  
周建忠 Zhou Jianzhong ◽  
杨小东 Yang Xiaodong ◽  
黄舒 Huang Shu ◽  
胡玲玲 Hu Lingling ◽  
黄娟 Huang Juan ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Shot Peening ◽  
Central Hole ◽  
Laser Shot ◽  
Residual Stress Field

NUMERICAL SIMULATION ON FATIGUE CRACK GROWTH OF METAL SHEET INDUCED BY LASER SHOT PEENING

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1646-1651 ◽  
Author(s):  
JIANFEI ZHAO ◽  
JIANZHONG ZHOU ◽  
SHU HUANG ◽  
SUQIN JIANG ◽  
YUJIE FAN
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Stress Field ◽  
Crack Growth ◽  
Shot Peening ◽  
Laser Shot ◽  
Finite Element Software

Based on theoretical analysis, finite element software ABAQUS and MSC.Fatigue were used to establish the forecasting model of fatigue life for laser shot peening (LSP) process. By using a standard stretch test sample of 6061-T6 aluminium alloy, the residual stress field induced by LSP was analyzed with ABAQUS code firstly, and then the stress field model was imported into MSC.Fatigue code for the crack growth analysis. The residual stress distribution and its effect on crack propagation life induced by LSP are numerical studied, and the fatigue life is predicted. The results show that numerical simulation approach is valuable for analyzing the fatigue crack growth and influence of process parameters on fatigue life.

Numerical Analysis on Fatigue Life of Wrought Magnesium Alloy Treated by Laser Shot Peening

Applied laser ◽  
2012 ◽  
Vol 32 (5) ◽  
pp. 379-383
Author(s):  
蒋素琴 Jiang Suqin ◽  
徐红光 Xu Hongguang ◽  
吴建华 Wu Jianhua ◽  
裴旭 Pei Xu
Keyword(s):  
Fatigue Life ◽  
Numerical Analysis ◽  
Magnesium Alloy ◽  
Shot Peening ◽  
Laser Shot ◽  
Wrought Magnesium Alloy
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