scholarly journals An Integrated Approach to the Determination and Consequences of Residual Stress on the Fatigue Performance of Welded Aircraft Structures

2009 ◽  
pp. 116-116-17 ◽  
Author(s):  
L. Edwards ◽  
M. E. Fitzpatrick ◽  
P. E. Irving ◽  
I. Sinclair ◽  
X. Zhang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Integrated Approach ◽  
Fatigue Performance ◽  
Aircraft Structures

scholarly journals An Integrated Approach to the Determination and Consequences of Residual Stress on the Fatigue Performance of Welded Aircraft Structures

2006 ◽  
Vol 3 (2) ◽  
pp. 12547 ◽  
Author(s):  
SW Dean ◽  
L Edwards ◽  
ME Fitzpatrick ◽  
PE Irving ◽  
I Sinclair ◽  
...  
Keyword(s):  
Residual Stress ◽  
Integrated Approach ◽  
Fatigue Performance ◽  
Aircraft Structures

Analysis of the Fatigue Performance of Thick T-Joint Samples Considering Residual Stresses

2016 ◽  
Author(s):  
J. A. Esnaola ◽  
I. Ulacia ◽  
D. Ugarte ◽  
A. Lopez-Jauregi ◽  
I. Torca ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Life Prediction ◽  
Fatigue Performance ◽  
T Joints ◽  
Thick Plates ◽  
Stress Load ◽  
Real Value ◽  
Number Of Passes ◽  
Different Thickness

Residual stress (RS) pattern of thick T-joint welds, which directly affects fatigue life, varies considerably depending on the thickness and number of passes. Nowadays, most approaches to predict fatigue life do not consider RS real value due to the difficulty of estimating them, hence, they tend to be conservatives. However, recent works have demonstrated that considering RS the conservative error in life prediction can be reduced down to around 15%. In the present work, the fatigue performance of multipass T-joints of S275JR plates for a thickness range from 20 to 60mm is evaluated considering RS. It is observed that maximum RS value for thick plates decreases progressively (down to 66% of yield stress). Consequently, fatigue performance of different thickness T-joint samples subjected to the same stress load cycles varies considerably in the HCF regime.

Mechanism of Fatigue Performance Enhancement in a Superhard Nanoparticles Integrated Nanocomposites by a Hybrid Manufacturing Technique

2013 ◽  
Author(s):  
Dong Lin ◽  
Chang Ye ◽  
Sergey Suslov ◽  
Yiliang Liao ◽  
C. Richard Liu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Performance Enhancement ◽  
Fatigue Performance ◽  
Hybrid Manufacturing ◽  
Laser Shock ◽  
Iron Matrix ◽  
Iron Powders ◽  
Tin Nanoparticles ◽  
Dislocation Movement ◽  
Shock Peening

A hybrid manufacturing process, which contains Laser Sintering (LS) and Laser shock peening (LSP), is introduced to generate iron-TiN nanoparticle nanocomposites. It is a two-step process including LS followed with LSP. Before LS, TiN nanoparticles mixed with iron powders are coated on samples surface. After LS, TiN nanoparticles are embedded into iron matrix to strengthen materials. Then LSP is performed to introduce work hardening and compressive residual stress. The existed nanoparticles increase the dislocation density and also help to pin the dislocation movement. Better residual stress stability under thermal annealing can be obtained by better dislocation movement stabilization, which is beneficial for fatigue performance.

scholarly journals Effect of Machined Surface Integrity on Fatigue Performance of Metal Workpiece: A Review

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Guoliang Liu ◽  
Chuanzhen Huang ◽  
Bin Zhao ◽  
Wei Wang ◽  
Shufeng Sun
Keyword(s):  
Residual Stress ◽  
Surface Topography ◽  
Surface Integrity ◽  
Work Hardening ◽  
Fatigue Cracks ◽  
Fatigue Performance ◽  
Effective Control ◽  
Published Data ◽  
Machined Surface ◽  
Machined Surface Integrity

AbstractFatigue performance is a serious concern for mechanical components subject to cyclical stresses, particularly where safety is paramount. The fatigue performance of components relies closely on their surface integrity because the fatigue cracks generally initiate from free surfaces. This paper reviewed the published data, which addressed the effects of machined surface integrity on the fatigue performance of metal workpieces. Limitations in existing studies and the future directions in anti-fatigue manufacturing field were proposed. The remarkable surface topography (e.g., low roughness and few local defects and inclusions) and large compressive residual stress are beneficial to fatigue performance. However, the indicators that describe the effects of surface topography and residual stress accurately need further study and exploration. The effect of residual stress relaxation under cycle loadings needs to be precisely modeled precisely. The effect of work hardening on fatigue performance had two aspects. Work hardening could increase the material yield strength, thereby delaying crack nucleation. However, increased brittleness could accelerate crack propagation. Thus, finding the effective control mechanism and method of work hardening is urgently needed to enhance the fatigue performance of machined components. The machining-induced metallurgical structure changes, such as white layer, grain refinement, dislocation, and martensitic transformation affect the fatigue performance of a workpiece significantly. However, the unified and exact conclusion needs to be investigated deeply. Finally, different surface integrity factors had complicated reciprocal effects on fatigue performance. As such, studying the comprehensive influence of surface integrity further and establishing the reliable prediction model of workpiece fatigue performance are meaningful for improving reliability of components and reducing test cost.

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