Corrosion Damage Residual Strength Research of Shot Peening Aluminum Alloy

2011 ◽  
Vol 121-126 ◽  
pp. 2587-2591
Author(s):  
Sheng Li Lv ◽  
You Cui ◽  
Wei Zhang ◽  
Xiao Yan Tong
Keyword(s):  
Aluminum Alloy ◽  
Surface Treatment ◽  
Residual Strength ◽  
Shot Peening ◽  
Corrosion Damage ◽  
Solid Model ◽  
Element Analysis ◽  
Engineering Technique ◽  
Relationship Of ◽  
The Relationship

The pre-corrosion damage tests of LC4 aluminum alloy with the shot peening surface treatment and un-shot peening surface treatment are performed under different time levels. The residual strength has been studied by test after corrosion damage. An analysis procedure is developed using 3D reconstruction solid model and finite element analysis to predict residual strength, The relationship of static intensity and the corrosion damage are founded. An effective engineering technique for predicting residual strength of corroded structure is established on the base of this studying work.

The Safety Study on Corrosion Damage of LC4 Aluminum Alloys by Finite Element Method

2010 ◽  
Vol 118-120 ◽  
pp. 176-180 ◽  
Author(s):  
Zhen Guo Wang ◽  
Sheng Li Lv ◽  
Cheng Long Xu ◽  
Wei Zhang
Keyword(s):  
Finite Element ◽  
Residual Strength ◽  
Corrosion Damage ◽  
Analysis Procedure ◽  
Solid Model ◽  
Three Dimension ◽  
Safety Study ◽  
Element Analysis ◽  
Damage Data ◽  
3D Solid

. The corrosion damage data are obtained through the pre-corrosion accelerated experiment which is performed under three different time levels: 24h, 48h and 72h. Based on the corrosion damage data, a three-dimension (3D) solid model is created by CAD. An analysis procedure is developed using CAD and finite element analysis to predict stresses and residual strength due to corroded pits. The residual strength results of specimens are obtained from the model based on the corrosion damage data. The simulation results are compared with the true testing static intensity results and the method is proved that it is reliable and effective in engineering.

The Relationship of High Strength Aluminum Alloy Corrosion Behavior and Corrosion Environment

2014 ◽  
Vol 904 ◽  
pp. 86-89
Author(s):  
Song Zhou ◽  
Li Hui ◽  
Liang Xu ◽  
Yu Tong Guo ◽  
Shao Hua Ma
Keyword(s):  
Aluminum Alloy ◽  
High Strength ◽  
Corrosion Damage ◽  
Fuel Tank ◽  
Nacl Solution ◽  
Surface Corrosion ◽  
Corrosion Pit ◽  
Corrosion Pits ◽  
Relationship Of ◽  
The Relationship

The aim of this article is to research the characteristics of corrosion pit on 2xxx aluminum alloys in different environments (3.5wt% NaCl solution, water in fuel tank and wet air). Measure the area of corrosion pit, the depth of corrosion pit in different environments. The results show that in 3.5wt% NaCl solution: the initiation of surface corrosion pits mainly occur in 24h, with time increasing ,the depth of corrosion pit rises indistinctively; in water in fuel tank : during 24h-120h, with the extension of corrosion time, the maximum depth of corrosion pits changed a little, the maximum corrosion area became a little smaller than that in 3.5wt% NaCl solution; in wet air: the corrosion damage was smaller than that in 3.5wt% NaCl solution and water in fuel tank, the depth of the corrosion pit was about 20μm, the biggest size of corrosion pit area was about 0.5 x104μm2.

Corrosion Damage Research of Shot Peening Aluminum Alloy

2011 ◽  
Vol 80-81 ◽  
pp. 113-118 ◽  
Author(s):  
Song Lin ◽  
Sheng Li Lv ◽  
Wei Zhang ◽  
Xiao Yan Tong
Keyword(s):  
Aluminum Alloy ◽  
Surface Treatment ◽  
Pitting Corrosion ◽  
Shot Peening ◽  
Intergranular Corrosion ◽  
Corrosion Damage ◽  
Damage Mechanism ◽  
Time Increase ◽  
Corrosion Morphology ◽  
Three Stages

The pre-corrosion damage tests of LC4 aluminum alloy with the shot peening surface treatment and un-shot peening surface treatment are performed under two different time levels: 12h and 24h. Based on the observation of the corrosion morphology of aluminum alloy, the corrosion damage mechanism of shot peening aluminum alloy can be divided into three stages: intergranular corrosion occurs first, and then denudation generates, at last pitting corrosion occurs as denudation depth reaches a certain degree. For shot peening aluminum alloy, the denudation depth, mass loss and the total depth of corrosion damage are used to represent the corrosion characteristics. With the corrosion time increase, the three parameters all increase correspondingly.

scholarly journals Fatigue Strength Enhancement of Butt Welds by Means of Shot Peening and Clean Blasting

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 744 ◽  
Author(s):  
Jonas Hensel ◽  
Hamdollah Eslami ◽  
Thomas Nitschke-Pagel ◽  
Klaus Dilger
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Surface Treatment ◽  
Shot Peening ◽  
Surface Preparation ◽  
High Strength ◽  
Butt Welds ◽  
Strength Enhancement ◽  
Lack Of Control ◽  
Mechanical Surface

Shot peening is a mechanical surface treatment to improve the fatigue strength of metallic components. Similarities exist between regular shot peening and conventional industrial clean blasting. However, the main difference between these two processes is the peening media used and the lack of control and documentation of peening parameters. The clean blasting process is not yet qualified to optimize fatigue enhancement, although it holds a similar potential to regular shot peening. Clean blasting is frequently applied to welded components, with the purpose of surface preparation for application of corrosion protection. This article presents the results of regular shot peened double V-groove (DV) butt welds made from construction steels S355N and S960QL, as well as the high strength aluminum alloy Al-6082. The peening parameters are varied widely. Furthermore, the effect of coverage and intensity is investigated to test the robustness of the peening processes. The data is completed with industrially clean blasted welds, representing typical workshop conditions. The overall objective of this work is to derive minimum peening parameters that still allow significant fatigue strength benefits. The presented data show a high robustness of the fatigue results to peening parameters.

Effect of Split-Sleeve Cold Expansion on the Fatigue Life of 7050-T7451 Aluminum Alloy

2014 ◽  
Vol 1082 ◽  
pp. 403-407 ◽  
Author(s):  
Hong Huang ◽  
Qing Yun Zhao ◽  
Feng Lei Liu
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Residual Stresses ◽  
Transgranular Fracture ◽  
Alloy Plate ◽  
Cold Expansion ◽  
Compressive Stresses ◽  
Aluminum Alloy Plate ◽  
Relationship Of ◽  
The Relationship

Split-sleeve cold expansion processing was employed on the 7050-T7451 aluminum alloy plate. Fatigue lives were compared according different expansion, then the relationship of fatigue life and expansion was analyzed. Residual stresses were measured with different expansion, and the fatigue fractograph was analyzed by SEM. The results show that the split-sleeve cold expansion can obtain longer life compared with the non-strengthen hole. When over the optimum expansion, fatigue life began to decrease. The maximum fatigue life increased to 2.92 times with 4.1% expansion. The maximum values of radial residual stresses grew with expansion. The depths of residual compressive stresses were more than 6mm with 2.6% and 4.1% expansion. The fatigue fractograph shows mixed transgranular fracture.

Experimental Research on Concrete Filled Thin-Walled Steel Tube Long Columns

2008 ◽  
Vol 400-402 ◽  
pp. 551-557 ◽  
Author(s):  
Bao Zhu Cao ◽  
Yao Chun Zhang ◽  
Yue Ming Zhao
Keyword(s):  
Experimental Research ◽  
Local Buckling ◽  
Steel Tube ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Global Buckling ◽  
Thin Walled ◽  
Relationship Of ◽  
The Relationship ◽  
Theoretical Results

Experimental research on square and octagonal concrete filled thin-walled steel tube long columns of 6 specimens in axial compression and 8 specimens in eccentric compression is undertaken. The relationship of global buckling bearing capacity of the columns and local buckling of the steel tubes is obtained. The test indicates that local buckling occurs in steel tube of each column before it reaches ultimate capacity, and has little effect on global buckling performance. The ultimate load decreases obviously with the increase of slender ratio and eccentricity. The ductility of columns increases with the increase of steel ratio in composite sections. Composite beam element of ANSYS is adopted in the finite element analysis. The theoretical results are agreed well with test..

The Corrosion Fatigue Life Research of Shot Peening Aluminum Alloy

2011 ◽  
Vol 366 ◽  
pp. 19-23
Author(s):  
Song Li ◽  
You Cui ◽  
Sheng Li Lv ◽  
Wei Zhang ◽  
Xiao Yan Tong
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Mass Loss ◽  
Significant Influence ◽  
Shot Peening ◽  
Corrosion Damage ◽  
Residual Fatigue Life ◽  
Contrast Analysis ◽  
Life Tests ◽  
Residual Fatigue

The corrosion is one kind of major damage mechanisms of airplane structure and is also one of the primary causes resulting in flight failure and disaster .The aim of this paper is to analyze the effect of corrosion time on denudation depth, mass loss and the total depth of corrosion damage. Meanwhile, the three parameters have significant influence on residual fatigue life of aluminum alloy, the residual fatigue life of the aluminum alloy is of great difference between shot peening and without shot peening aluminum alloy. Then residual fatigue life tests are carried on Instron 8801 for the shot peening and without shot peening aluminum alloy. Based on contrast analysis of the experimental results, valuable conclusions are obtained: with the increase of the denudation depth, mass loss and the total depth of corrosion damage, fatigue life reduce continuously respectively; Fatigue life decreases rapidly when the denudation depth is in the range of 0.12～0.17mm.

Behavior of Localized Bottom Bulge in Aboveground Oil Storage Tanks Under Liquid Pressure

2001 ◽  
Vol 124 (1) ◽  
pp. 59-65
Author(s):  
Shoichi Yoshida
Keyword(s):  
Plastic Strain ◽  
Plate Thickness ◽  
Deformation Analysis ◽  
Bottom Plate ◽  
Storage Tanks ◽  
Liquid Pressure ◽  
Element Analysis ◽  
Oil Storage ◽  
Relationship Of ◽  
The Relationship

The bottom plate of aboveground oil storage tanks can bulge, separating from the foundation due to welding deformation. When such a bulge is subjected to liquid pressure, it deforms continuously to make contact with the foundation from the edge, and the remaining area of the bulge decreases with increasing liquid pressure. As a result, the deformation is extremely localized and plastic strain occurs at the bulge. This paper presents a plane strain finite element analysis for the evaluation of localized bottom bulges in aboveground oil storage tanks. Load-incremental, elastic-plastic large deformation analysis is carried out considering the bottom plate contact with the foundation. The relationship of the plastic strain at the bulged bottom plate to the liquid pressure is discussed together with the deformation of the bulge. As a result, the bottom plate thickness has a significant effect on the deformation, but the bulged height does not. After the bulged center makes contact with the foundation, the stress and strain do not increase with increasing liquid pressure. In addition, the permissible bulged profile specified by API Standard 653 elastically deforms to make contact with the foundation under low liquid pressure.

The Compressive Behavior of Horizontally Casted Concrete Filled Steel Tubular Members with Consideration of the Process of Concrete Casting

2011 ◽  
Vol 243-249 ◽  
pp. 45-50
Author(s):  
Wen Bo Sun ◽  
Yi Qun Luo ◽  
Wei Huang
Keyword(s):  
Bearing Capacity ◽  
Slenderness Ratio ◽  
Nonlinear Finite Element ◽  
Compressive Behavior ◽  
Element Analysis ◽  
Calculation Results ◽  
Strain Relationship ◽  
Concrete Casting ◽  
Relationship Of ◽  
The Relationship

Concrete casting effect and the hooping effect of concrete filled tubular members is considered in the study of this paper. Firstly, standard stress-strain relationship of concrete and steel is chosen to simulate others’ test, and meanwhile the calculation results by nonlinear finite element analysis are compared with the results of the test. Then the bearing capacity of horizontally casted concrete filled steel tubular members under axial compression is contrasted among different construction processes. Finally, the effect of slenderness ratio of concrete filled tubular members is studied so as to reveal the relationship between the bearing capacity and slenderness ratio.

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