Influence of Stress Concentration on Fatigue Property of Welded Joints of 5083 Aluminum Alloy

Fatigue test of the welded joint of 5083 aluminum alloy with smooth and height of specimen and the weld zone than the high test measurement and theoretical stress concentration coefficient calculation, the weld reinforcement effect of stress concentration on the fatigue performance of welded joints. The results show that: Smooth tensile strength of specimens for 264MPa, fatigue strength is 95MPa, the tensile strength of the 36%. Higher tensile strength of specimens for 320MPa, fatigue strength is 70MPa, the tensile strength of the 22%. Higher specimen stress concentration coefficient is 1.64, the stress concentration to the weld toe becomes fatigue initiation source, and reduces the fatigue strength and the fatigue life of welded joints.

Download Full-text

Tensile Strength and Fatigue Strength of 6061 Aluminum Alloy Friction Welded Joints

Materials Science Forum ◽

10.4028/www.scientific.net/msf.396-402.1685 ◽

2002 ◽

Vol 396-402 ◽

pp. 1685-1690

Author(s):

Hiizu Ochi ◽

Takeshi Sawai ◽

Yoshiaki Yamamoto ◽

Koichi Ogawa ◽

Yasuo Suga ◽

...

Keyword(s):

Tensile Strength ◽

Aluminum Alloy ◽

Fatigue Strength ◽

Welded Joints ◽

6061 Aluminum Alloy

Download Full-text

Calculation about the Effect of Stress Concentration Coefficient on the Fatigue Properties for Welded Cruciform Joints of 16MnR Steel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.189.350 ◽

2012 ◽

Vol 189 ◽

pp. 350-354

Author(s):

Ying Xia Yu ◽

Bo Lin He ◽

Xiao Dong Zhang

Keyword(s):

Mechanical Properties ◽

Fatigue Life ◽

Stress Concentration ◽

Welded Joints ◽

Fatigue Properties ◽

Concentration Coefficient ◽

Cruciform Joints ◽

Welded Structures ◽

Line Angle ◽

Stress Concentration Coefficient

Stress concentration coefficient of welded joints has a crucial influence on mechanical properties of welded structures. Geometrical parameters of welded joints seriously affect the stress concentration coefficient. In order to increase the mechanical properties and safety of welded structures, it has great significance for reducing stress concentration coefficient and improving the mechanical properties of welded structures by researching and improving the geometry of welded joints. In this paper, the effect of stress concentration coefficient on the fatigue properties for welded cruciform joints of 16MnR steel was analyzed by using ABAQUS finite element and MSC.Fatigue programe, and the change rule of stress concentration coefficient with the variation of the parameter was studied and the fatigue life changed with the stress concentration coefficient was also researched. The calculation results indicate that reducing the weld tangent line angle θ can effectively decrease the stress concentration coefficient of welded cruciform joints, and the fatigue life of welded cruciform joints can be improved succesfully. In order to obtain the safety welded structures, the true weld tangent line angle θ should be controlled in the angle smaller than 20o.

Download Full-text

Calculation about Stress Concentration Coefficient of Welded Cruciform Joints of Magnesium Alloy Based on FEM

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.931 ◽

2014 ◽

Vol 989-994 ◽

pp. 931-934 ◽

Cited By ~ 1

Author(s):

Bo Lin He ◽

Ying Xia Yu ◽

Xiao Dong Zhang ◽

Song Song Xia

Keyword(s):

Magnesium Alloy ◽

Stress Concentration ◽

Fatigue Property ◽

Tangent Line ◽

Concentration Coefficient ◽

Cruciform Joints ◽

Welded Structures ◽

Welded Structure ◽

Line Angle ◽

Stress Concentration Coefficient

Geometrical parameters of welded joint affect the stress concentration coefficient seriously. In order to increase the fatigue property of welded structure, it has great significance to reduce stress concentration coefficient of welded structures by researching and improving the geometry of welded joints. In this paper, the effects of weld tangent line angle θ on the stress concentration coefficient of welded cruciform joints of magnesium alloy were analyzed by using ABAQUS finite element program, and the change rule of stress concentration coefficient with the variation of the parameter was also researched. The calculation results indicate that reducing the weld tangent line angle θ can effectively decrease the stress concentration coefficient of welded cruciform joints, so as to improve the fatigue property of welded structures. In order to have high reliability and safety of welded structures of magnesium alloy, the true weld tangent line angle θ should be controlled less than 25°.

Download Full-text

21303 Fatigue Property of Friction Stir Welded 5083 Aluminum Alloy : Cutting Direction of Specimen and Fatigue Strength

The Proceedings of Conference of Kanto Branch ◽

10.1299/jsmekanto.2008.14.341 ◽

2008 ◽

Vol 2008.14 (0) ◽

pp. 341-342

Author(s):

Masumi YAHATA ◽

Hiroshi OKAMURA ◽

Takao UTSUNOMIYA ◽

Hiroshi KAJIYAMA ◽

Takeo YOKOTA

Keyword(s):

Aluminum Alloy ◽

Fatigue Strength ◽

Fatigue Property ◽

Friction Stir ◽

5083 Aluminum Alloy ◽

Cutting Direction

Download Full-text

Finite Element Calculation about Stress Concentration Coefficient of Welded Butt Joints of Magnesium Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.935 ◽

2014 ◽

Vol 989-994 ◽

pp. 935-938

Author(s):

Ying Xia Yu ◽

Bo Lin He ◽

Xiao Dong Zhang ◽

Si Yong Lei

Keyword(s):

Finite Element ◽

Stress Concentration ◽

Inclination Angle ◽

Fatigue Property ◽

Concentration Coefficient ◽

Butt Joints ◽

Welded Structures ◽

Weld Toe ◽

Weld Edge ◽

Stress Concentration Coefficient

Geometrical parameters of welded joint affect the stress concentration coefficient seriously. In order to increase the fatigue property of welded structure, it has great significance to reduce stress concentration coefficient of welded structures by researching and improving the geometry of welded joints. In this paper, the effects of weld toe inclination angle θ and weld edge transition arc radius r on the stress concentration coefficient of welded butt joints of magnesium alloy were analyzed by using ABAQUS finite element program, and the change rule of stress concentration coefficient with the variation of the two parameters was also researched. The calculation results indicate that reducing weld toe inclination angle or increasing transition arc radius can effectively decrease the stress concentration coefficient of welded butt joints, so as to improve the fatigue property of welded structures. For the safe use of welded structures, the true weld edge transition arc radius r should be greater than 3mm, and weld toe inclination angle θ should be smaller than 30°.

Download Full-text

Finite Element Calculation about Stress Concentration Coefficient of Welded Butt Joints Based on the ABAQUS

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.80-81.807 ◽

2011 ◽

Vol 80-81 ◽

pp. 807-811 ◽

Cited By ~ 4

Author(s):

Bo Lin He ◽

Xiao Dong Zhang

Keyword(s):

Mechanical Properties ◽

Stress Concentration ◽

Inclination Angle ◽

Welded Joints ◽

Concentration Coefficient ◽

Butt Joints ◽

Welded Structures ◽

Weld Toe ◽

Weld Edge ◽

Stress Concentration Coefficient

Stress concentration coefficient of welded joints has a crucial influence on mechanical properties of welded structures. Geometrical parameters of welded joints seriously affect the stress concentration coefficient. In order to increase the mechanical properties and using safety of welded structures, it has great significance for reducing stress concentration coefficient and improving the mechanical properties of welded structures by researching and improving the geometry of welded joints . In this paper, the effect of weld toe inclination angle θ and weld edge transition arc radius r on the stress concentration coefficient of welded butt joints were analyzed by using ABAQUS finite element program, and the change rule of stress concentration coefficient with the variation of the two parameters was also researched. The calculation results indicate that reducing weld toe inclination angle or increasing transition arc radius can effectively decrease the stress concentration coefficient of welded butt joints, so as to improve the mechanical properties of welded structures. For the safe use of welded structures, the true weld edge transition arc radius r should be greater than 3mm, and weld toe inclination angle θ should be smaller than 30°.

Download Full-text

Effect of inclusion on performance of A6N01 aluminum alloy joints

Materials Express ◽

10.1166/mex.2020.1767 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1395-1403

Author(s):

Mengyu Ding ◽

Min Yu ◽

JunWei Hua ◽

Hui Chen

Keyword(s):

Tensile Strength ◽

Aluminum Alloy ◽

Fatigue Strength ◽

Stress Concentration ◽

Aluminum Alloys ◽

Base Metal ◽

Tensile Loading ◽

Loading Process ◽

Tensile Fatigue

In order to study the effect of inclusion on performance of A6N01 aluminum alloy joints, the N-A6N01 and C-A6N01 aluminum alloys with different inclusion in amount and size were compared. Results show that the larger inclusions in amount and size in the N-A6N01 joint cause more pronounced degradation in the tensile strength than the C-A6N01 joint. However, the N-A6N01 joint shows a superior fatigue strength to the C-A6N01 under the tensile fatigue, this probably because the degradation in the tensile strength contributes a uniform performance mating between the base metal and WM, which reduces the stress concentration during the tensile loading process, and thus improving the fatigue strength.

Download Full-text

Effect of Welding Wires Containing ZrB2 Particles on Microstructure and Mechanical Properties of Spray-Formed 7055 Aluminum Alloy TIG Welded Joints

Advances in Materials Science and Engineering ◽

10.1155/2021/6953756 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Ting Huang ◽

Junhua Xu ◽

Lihua Yu ◽

Yunxuan Hu ◽

Yun Cheng ◽

...

Keyword(s):

Tensile Strength ◽

Aluminum Alloy ◽

Welded Joints ◽

Welded Joint ◽

Testing Machine ◽

Weld Zone ◽

Tensile Testing Machine ◽

Hardness Tester ◽

7055 Aluminum Alloy

In this paper, a series of welding wires with ZrB2 particles were developed by the in situ reaction, and the ZrB2 particles were successfully introduced into the spray-formed 7055 aluminum alloy welded joints by TIG welding. The microstructure, hardness, and tensile strength of the welded joints were tested by metallographic microscope, SEM, EDS, Vickers hardness tester, and tensile testing machine. The results show that the microstructure of ZrB2/7055 welded joints is fine dendrites. The hardness of the weld zone of the ZrB2/7055 welded joint is higher than that of the 7055 welded joint. With the increase of ZrB2 particles’ content, the tensile strength of welded joints increases first and then decreases. When the content of ZrB2 particles is 1.5 wt.%, the tensile strength reaches the maximum value of 280 MPa. The tensile strength of the welded joint containing 1.5 wt.% ZrB2 particles is 14% higher than that of the pure 7055 aluminum alloy welded joint.

Download Full-text

Improving the Properties of Laser-Welded Al–Zn–Mg–Cu Alloy Joints by Aging and Double-Sided Ultrasonic Impact Compound Treatment

Materials ◽

10.3390/ma14112742 ◽

2021 ◽

Vol 14 (11) ◽

pp. 2742

Author(s):

Furong Chen ◽

Chenghao Liu

Keyword(s):

Plastic Deformation ◽

Tensile Strength ◽

Tensile Properties ◽

Welded Joints ◽

Welded Joint ◽

Weld Zone ◽

Aging Treatment ◽

Residual Tensile Stress ◽

Impact Surface ◽

Deformation Layer

To improve the loose structure and serious porosity of (Al–Zn–Mg–Cu) 7075 aluminum alloy laser-welded joints, aging treatment, double-sided ultrasonic impact treatment (DSUIT), and a combination of aging and DSUIT (A–DSUIT) were used to treat joints. In this experiment, the mechanism of A–DSUIT on the microstructure and properties of welded joints was analyzed. The microstructure of the welded joints was observed using optical microscopy, scanning electron microscopy, and electron backscatter diffraction (EBSD). The hardness and tensile properties of the welded components under the different processes were examined via Vickers hardness test and a universal tensile testing machine. The results showed that, after the aging treatment, the dendritic structure of the welded joints transformed into an equiaxed crystal structure. Moreover, the residual tensile stress generated in the welding process was weakened, and the hardness and tensile strength were significantly improved. After DSUIT, a plastic deformation layer of a certain thickness was generated from the surface downward, and the residual compressive stress was introduced to a certain depth of the joint. However, the weld zone unaffected by DSUIT still exhibited residual tensile stress. The inner microhardness of the joint surface improved; the impact surface hardness was the largest and gradually decreased inward to the weld zone base metal hardness, with a small improvement in the tensile strength. Compared with the single treatment process, the microstructural and mechanical properties of the welded joint after A–DSUIT were comprehensively improved. The microhardness and tensile strength of the welded joint reached 200 HV and 615 MPa, respectively, for an increase of 45.8% and 61.8%, respectively. Observation of the fractures of the tensile specimens under the different treatment processes showed that the fractures before the aging treatment were mainly ductile fractures while those after were mainly brittle fractures. After DSUIT of the welded joints, a clear and dense plastic deformation layer was observed in the fracture of the tensile specimens and effectively improved the tensile properties of the welded joints. Under the EBSD characterization, the larger the residual compressive stress near the ultrasonic impact surface, the smaller the grain diameter and misorientation angle, and the lower the texture strength. Finally, after A–DSUIT, the hardness and tensile properties improved the most.

Download Full-text