scholarly journals Fatigue life evaluation model for high-strength steel wire considering different levels of corrosion

2020 ◽  
Author(s):  
Nani Bai ◽  
Hui Li ◽  
Junming Ma ◽  
Chengming Lan ◽  
B.F. Spencer, Jr
Keyword(s):  
Fatigue Life ◽  
High Strength Steel ◽  
Evaluation Model ◽  
Steel Wire ◽  
High Strength ◽  
Life Evaluation ◽  
Fatigue Life Evaluation ◽  
Different Levels

Fatigue Analysis of Multi-Lap Spot Welding of High Strength Steel by Quasi Static Tensile- Shear Test

2007 ◽  
Vol 345-346 ◽  
pp. 251-254
Author(s):  
Su Rok Sin ◽  
Sung Mo Yang ◽  
Hyo Sun Yu ◽  
Chai Won Kim ◽  
Hee Yong Kang
Keyword(s):  
Fatigue Life ◽  
High Strength Steel ◽  
Shear Test ◽  
Welding Current ◽  
High Strength ◽  
Tensile Shear ◽  
Life Evaluation ◽  
Static Tensile ◽  
Fatigue Life Evaluation

The welding quality of spot weldment is an important factor that significantly affects the strength, stiffness, safety, and other performance characteristics of vehicles. Therefore, quality control and fatigue life evaluation of spot weldment are necessary processes. This paper presents a method for determining the fatigue life of multi-lap spot weldment of a high strength steel sheet. In this method, the fatigue life is estimated by using the lethargy coefficient, which is the total defect coefficient according to rupture stress and time obtained by the quasi static tensile-shear test. Also, in this study, we modified the lethargy coefficient by using the welding current. And, we define a specific lapping constant, which is a characteristic constant of 2 or 3 lap weldments. The fatigue life obtained by the fatigue estimate equation, which contains a specific lapping constant was compared and verified with an experimental value. And we analyzed the relation of lap number, welding current and fatigue life. This method can save processing time and cost for predicting the life cycle of a structure.

scholarly journals Fatigue Life Evaluation Considering Fatigue Reliability and Fatigue Crack for FV520B-I in VHCF Regime Based on Fracture Mechanics

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 371 ◽  
Author(s):  
Jinlong Wang ◽  
Yuxing Yang ◽  
Jing Yu ◽  
Jingsi Wang ◽  
Fengming Du ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Fracture Mechanics ◽  
Evaluation Method ◽  
Evaluation Model ◽  
Fatigue Cracking ◽  
High Strength ◽  
Fatigue Reliability ◽  
Life Evaluation ◽  
Fatigue Life Evaluation ◽  
Very High

This paper focuses on the fatigue reliability analysis and the development of a new life model of reliability and crack growth mechanisms in FV520B-I (high strength martensitic-type stainless steels) in the very-high cycle fatigue (VHCF) regime, which haven’t been studied well. First, the fatigue test was carried out to clarify the fatigue failure mechanism in the very-high cycle regime. Based on the test results and fatigue reliability theory, the fatigue life distribution and P-S-N curves were modeled. A new fatigue life evaluation model for FV520B-I is proposed according to the fracture mechanics and classic life evaluation method. With the comprehensive application of P-S-N curves and a new proposed fatigue life evaluation model, a new assumption of a P-Sc-N curve is developed and verified, to quantitatively express the relationship between fatigue life, reliability and fatigue cracking. This is novel and valuable for further fatigue study of FV520B-I.

scholarly journals Corrosion-Fatigue Analysis of High-Strength Steel Wire by Experiment and the Numerical Simulation

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 734
Author(s):  
Songling Xue ◽  
Ruili Shen
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Prediction Model ◽  
Corrosion Fatigue ◽  
High Strength Steel ◽  
Life Prediction ◽  
Steel Wire ◽  
High Strength ◽  
Starting Point ◽  
Life Prediction Model

The paper takes the corrosion fatigue damage of cable or sling in the actual bridge as a starting point. The high-strength steel wire is chosen as the basic component to study the corrosion fatigue failure mode. The service life prediction model is put forward, which provides a basis for future research. In this paper, the S-N curves of the steel wire with the different corrosion degrees are given through fatigue tests of six groups of steel wire under different corrosion conditions. The results show that the higher the corrosion degree, the steeper the S-N curve, and the fatigue life considering corrosion are much lower than that without considering corrosion. Finally, a fatigue life prediction model considering the coupling effect of corrosion fatigue is proposed and embedded into Abaqus v6.14 (Dassault, Paris, French). The calculation results show that the fatigue model considering the corrosion can predict the service life to some extent.

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