scholarly journals Fatigue Strength Evaluation of Welded Structure on Aluminum Alloy Car Body Based on Multi-Axial Stress

2021 ◽  
Author(s):  
Yiming Shangguan ◽  
Wenjing Wang ◽  
Chao Yang ◽  
Anrui He
Keyword(s):  
Shear Stress ◽  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Normal Stress ◽  
Welded Joint ◽  
Axial Stress ◽  
Stress Component ◽  
Local Coordinate System ◽  
Strength Evaluation ◽  
Welded Structure

Abstract With the continuous development of the subway, the demand for its safety and stability is getting higher and higher. It is of great significance to accurately evaluate the fatigue life of the carbody to ensure the subway's safe operation. In this paper, the finite element model of a subway head carbody was established, and the fatigue strength of the welded structure on the carbody was evaluated based on Multi-axial stress. The local coordinate system was defined according to the geometrical characteristics of the welds. Local stresses perpendicular and parallel to the weld seam were obtained to calculate the stress ratio, stress range, and allowable stress value corresponding to the stress component. According to the joint fatigue resistance, the components of the degree of utilization and comprehensive degree of utilization are calculated to evaluate the structural fatigue strength under the survival rate of 97.5% and load cycles of 10 7 . The evaluation of the fatigue strength of the pivotal weld joints shows that the fatigue strength of the aluminum alloy carbody meets the design requirements, the weld of the carbody has a strong ability to resist fatigue damage. The fatigue strength of the weld is mainly affected by the normal stress component, while the shear stress has little effect on the fatigue strength of the structure. In addition, compared with the filleted weld joint and the butt-welded joint, the normal stress parallels to and perpendicular to the weld direction and shear stress have the greatest effect on the lap-welded joint. Meanwhile, the comprehensive degree of utilization of the lap-welded joint is the largest at 0.49. The introduction of multi-axial stress for the fatigue strength evaluation is beneficial when considering the material utilization degree in multiple structural directions. This research results provide a reference for fatigue strength evaluation of subway carbody's welded structure.

scholarly journals Evaluation of Tensile Strength and Fatigue Strength of 6061 Aluminum Alloy Friction Welded Joint

2002 ◽  
Vol 51 (9Appendix) ◽  
pp. 156-161
Author(s):  
Hiizu OCHI ◽  
Takeshi SAWAI ◽  
Yoshiaki YAMAMOTO ◽  
Masayuki KURITA ◽  
Koichi OGAWA ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Welded Joint ◽  
6061 Aluminum Alloy

scholarly journals Fatigue Strength Evaluation of Welded Joint in Pressure Vessel by Probabilistic Fracture Mechanics.

1997 ◽  
Vol 46 (7) ◽  
pp. 795-800
Author(s):  
Shuichi TANI ◽  
Akemi HIJIKATA ◽  
Yuujirou MATSUSIMA ◽  
Akio INOUE ◽  
Sumio YOSHIOKA
Keyword(s):  
Fatigue Strength ◽  
Fracture Mechanics ◽  
Pressure Vessel ◽  
Welded Joint ◽  
Strength Evaluation ◽  
Probabilistic Fracture Mechanics

Mechanical properties of a dissimilar aluminum alloy joint welded by hybrid laser–MIG welding

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744037 ◽  
Author(s):  
Qiuying Wang ◽  
Hui Chen ◽  
Zongtao Zhu ◽  
Yunlong Cui
Keyword(s):  
Mechanical Properties ◽  
Fatigue Strength ◽  
Welded Joint ◽  
Probability Of Failure ◽  
Dissimilar Joint ◽  
Mig Welding ◽  
Welded Structure ◽  
Fatigue Data ◽  
Service Conditions ◽  
The Mean

Two dissimilar Al alloys, 5083-H111 and 6005A-T6, were joined by hybrid laser–MIG welding method. Mechanical properties of the welded joint were investigated and compared. The results show that the tensile strength of the dissimilar joint is 219.8 MPa, 11.7% higher than that of 6005A-T5 joint. After statistical analysis of the fatigue data, the [Formula: see text]–[Formula: see text]–[Formula: see text] curves of the dissimilar joint were obtained. The mean fatigue strength at [Formula: see text] of the dissimilar joint is 112.5 MPa. The fatigue strength at [Formula: see text] of the dissimilar joint for a given 10% probability of failure, at a confidence level of 95%, is 101.4 MPa. The fatigue strength at [Formula: see text] of the dissimilar joint is almost same as that of the 6005A-T6 joint. In welded structure designing, different [Formula: see text]–[Formula: see text]–[Formula: see text] curves should be chosen according to the different service conditions and reliability requirements.

scholarly journals An Experimental Study of Initial and Subsequent Yield Surfaces in Plasticity

1958 ◽  
Vol 25 (2) ◽  
pp. 201-209
Author(s):  
P. M. Naghdi ◽  
F. Essenburg ◽  
W. Koff
Keyword(s):  
Experimental Study ◽  
Shear Stress ◽  
Aluminum Alloy ◽  
Shear Modulus ◽  
Axial Stress ◽  
Fourth Quadrant ◽  
Stress Plane ◽  
Yield Surfaces ◽  
Elastic Shear ◽  
Tubular Specimens

Abstract Experimental results for twenty-five tubular specimens of a 24S-T-4 aluminum alloy, subjected to combined torsion-tension-reversed torsion, are reported in a study of the initial and two subsequent yield surfaces covering the first and the fourth quadrant of the axial stress-shear stress plane. Results are also given for two additional specimens subjected to tension followed by torsion, in order to compare the values of the initial shear modulus at the initiation of twist with the elastic shear modulus.

scholarly journals Fatigue strength evaluation and fracture behavior of joined dual phase steel/AA6061-T6 aluminum alloy

2019 ◽  
Vol 13 (48) ◽  
pp. 530-544
Author(s):  
Ruben Perez Mora ◽  
Celso Eduardo Cruz Gonzalez ◽  
Saul Daniel Santillan Gutierrez ◽  
Jose Jaime Taha Tijerina ◽  
Benjamin Vargas Arista ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Fracture Behavior ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Strength Evaluation
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