Improving weld class systems in assessing the fatigue life of different welded joint designs

2011 ◽  
pp. 139-167
Author(s):  
B. Jonsson
Keyword(s):  
Fatigue Life ◽  
Welded Joint

scholarly journals Rapid fatigue life prediction for spot-welded joint of SUS301 L-DLT stainless steel and Q235B carbon steel based on energy dissipation

2018 ◽  
Vol 10 (11) ◽  
pp. 168781401881101 ◽  
Author(s):  
Yaliang Liu ◽  
Yibo Sun ◽  
Yang Sun ◽  
Hongji Xu ◽  
Xinhua Yang
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Carbon Steel ◽  
Energy Dissipation ◽  
Life Prediction ◽  
Welded Joint ◽  
Fatigue Behavior ◽  
Dissimilar Materials ◽  
Fatigue Life Prediction ◽  
Spot Welded

Spot welding of dissimilar materials can utilize the respective advantage comprehensively, of which reliable prediction of fatigue life is the key issue in the structure design and service process. Taking into account almost all the complex factors that have effects on the fatigue behavior such as load level, thickness, welding nugget diameter, vibrational frequency, and material properties, this article proposed an energy dissipation-based method that is able to predict the fatigue life for spot-welded dissimilar materials rapidly. In order to obtain the temperature gradient, the temperature variations of four-group spot-welded joint of SUS301 L-DLT stainless steel and Q235 carbon steel during high-cycle fatigue tests were monitored by thermal infrared scanner. Specifically, temperature variation disciplines of specimen surface were divided into four stages: temperature increase, temperature decrease, continuous steady increase in temperature, and ultimate drop after the fracture. The material constant C that a spot-welded joint of dissimilar material needs to reach fracture is 0.05425°C·mm3. When the specimen was applied higher than the fatigue limit, the highest error between experimental values and predicted values is 18.90%, and others are lower than 10%. Therefore, a good agreement was achieved in fatigue life prediction between the new method and the validation test results.

Process Development to Obtain Cost Reduction and Fatigue Life for Cruciform Fillet Welded Joint of Load Carry Type

2019 ◽  
Vol 43 (5) ◽  
pp. 343-349
Author(s):  
Jung Hyun Park ◽  
Jae Gyu Byun ◽  
Chang Wook Wee ◽  
Jin Woo Kim ◽  
Sang Myung Cho
Keyword(s):  
Fatigue Life ◽  
Cost Reduction ◽  
Process Development ◽  
Welded Joint

Effect of Strain Rate Variation on Fatigue Life of Spot Welded Joint

2005 ◽  
pp. 2447-2452
Author(s):  
Joon Hyuk Song ◽  
Hyu Sun Yu ◽  
Hee Yong Kang ◽  
Sung Mo Yang
Keyword(s):  
Fatigue Life ◽  
Strain Rate ◽  
Welded Joint ◽  
Rate Variation ◽  
Spot Welded

Review on fatigue life prediction models of welded joint

2020 ◽  
Vol 36 (3) ◽  
pp. 701-726 ◽  
Author(s):  
Guozheng Kang ◽  
Huiliang Luo
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Prediction Models ◽  
Welded Joint ◽  
Fatigue Life Prediction

Nonlinear Cumulative Fatigue Damage Model

2011 ◽  
Vol 328-330 ◽  
pp. 1440-1444
Author(s):  
Hua Zou ◽  
Qiang Li ◽  
Shou Guang Sun
Keyword(s):  
Mathematical Model ◽  
Aluminum Alloy ◽  
Fatigue Life ◽  
Fatigue Damage ◽  
Welded Joint ◽  
Damage Model ◽  
Reasonable Explanation ◽  
Curve Method ◽  
Cumulative Fatigue Damage ◽  
Damage Rule

Cumulative fatigue damage is an important consideration in determining the fatigue life of structures. A cumulative linear damage rule cannot provide a reasonable explanation for cumulative fatigue damage, but a damage curve method based on nonlinear cumulative fatigue damage model can give a reasonable explanation. In this paper, a specific mathematical model is put forward, which is based on the damage curve method. In the model, miner formula is modified properly and an exponent formula is give out to fit the damage accumulate. According to a two-step fatigue test of aluminum–alloy welded joint, the comparison between the calculated results and the testing results is less than 5%. It shows that the model is reasonable and accuracy.

G0301104 Influence of Variation of Nugget Diameter and Spot Welding Location on Fatigue Life of Spot Welded Joint

2015 ◽  
Vol 2015 (0) ◽  
pp. _G0301104--_G0301104-
Author(s):  
Masaki WASHIO ◽  
Chihiro TAKATUSUKA ◽  
Noboru TOMIOKA ◽  
Akifumi OKABE
Keyword(s):  
Fatigue Life ◽  
Spot Welding ◽  
Welded Joint ◽  
Nugget Diameter ◽  
Spot Welded

Probabilistic corrosion fatigue life assessment of a suspension bridge instrumented with long-term structural health monitoring system

2017 ◽  
Vol 20 (5) ◽  
pp. 674-681 ◽  
Author(s):  
XW Ye ◽  
T Liu ◽  
YQ Ni
Keyword(s):  
Fatigue Life ◽  
Structural Health Monitoring ◽  
Monitoring System ◽  
Corrosion Fatigue ◽  
Health Monitoring ◽  
Welded Joint ◽  
Health Monitoring System ◽  
Structural Health ◽  
Structural Health Monitoring System

The long-term performance of engineering structures in a corrosive environment will be significantly affected by the coupled action of corrosion and fatigue. In this article, a probabilistic corrosion fatigue analytical model is proposed by taking into account the effects of corrosion-induced reduction of the cross-sectional area and deterioration of the fatigue strength of structural components. The proposed model is exemplified to evaluate the probabilistic corrosion fatigue life of a typical welded joint in the suspension Tsing Ma Bridge instrumented with a long-term structural health monitoring system. A genetic algorithm–based mixture parameter estimation method is developed to facilitate the multimodal modeling of stress spectrum derived from the long-term monitoring data of dynamic strain. The achieved results demonstrate that with the increase in the service life, the reliability index of the investigated typical welded joint is dramatically reduced under the combined effect of corrosion and fatigue.

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