scholarly journals Probabilistic Estimation of Fatigue Strength for Axial and Bending Loading in High-Cycle Fatigue

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1148 ◽  
Author(s):  
Tomasz Tomaszewski ◽  
Przemysław Strzelecki ◽  
Adam Mazurkiewicz ◽  
Janusz Musiał
Keyword(s):  
High Cycle Fatigue ◽  
Construction Materials ◽  
Cumulative Distribution ◽  
Cycle Fatigue ◽  
Specific Test ◽  
Stressed Volume ◽  
Model Based ◽  
Weakest Link ◽  
Link Theory ◽  
Bending Loading

In this paper, the sensitivity to the type of loads (axial and bending loading) of selected construction materials (AW6063 T6 aluminum alloy, S355J2+C structural steel, and 1.4301 acid-resistant steel) in high-cycle fatigue was verified. The obtained S-N fatigue characteristics were described by a probabilistic model of the 3-parameters Weibull cumulative distribution function. The main area of research concerned the correct implementation of the weakest link theory model. The theory is based on a highly-stressed surface area and a highly-stressed volume in the region of the highest stresses. For this purpose, an analytical model and a numerical model based on the finite element method were used. The model that gives the lowest error implemented in specific test conditions was determined on the basis of high-cycle fatigue analysis. For the analyzed materials, it was a highly-stressed volume model based on the weakest link theory.

Multiaxial fatigue life estimation of defective aluminum alloy considering the microstructural heterogeneities effect

2018 ◽  
Vol 233 (9) ◽  
pp. 1830-1842
Author(s):  
Amal Ben Ahmed ◽  
Ahmad Bahloul ◽  
Mohamed Iben Houria ◽  
Anouar Nasr ◽  
Raouf Fathallah
Keyword(s):  
Aluminum Alloy ◽  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Multiaxial Fatigue ◽  
Cycle Fatigue ◽  
Post Heat Treatment ◽  
Stressed Volume ◽  
Good Ability ◽  
Fatigue Life Estimation ◽  
Chaboche Model

The Al–Si–Mg high-cycle fatigue behavior is mainly affected by the microstructural heterogeneities and the presence of casting defects. This attempt aims to develop an analytical approach based on the evaluation of the highly stressed volume caused by local porosities and defined as the affected area methodology. The proposed approach is able to predict the aluminum alloy fatigue response by considering the effect of microstructure described by the secondary dendrite arm spacing and its correlation with the defect size effect. A representative elementary volume model is implemented to evaluate the stress distribution in the vicinity of the defect and to determine its impact on the high-cycle fatigue resistance. Work hardening due to cyclic loading is considered by applying the Lemaitre–Chaboche model. The Kitagawa–Takahashi diagrams corresponding to different microstructures and for two loading ratios: R σ = 0 and R σ = −1 were simulated based on the AA method. Simulations were compared to the experimental results carried out on cast aluminium alloy A356 with T6 post heat-treatment. The results show clearly that the proposed approach provides a good estimation of the A356-T6 fatigue limit and exhibits good ability in simulating the Kitagawa–Takahashi diagrams for fine and coarse microstructures.

High Cycle Fatigue and Fatigue Crack Propagation Behaviors of Modified A7075-T73 Alloy

2014 ◽  
Vol 52 (4) ◽  
pp. 283-291 ◽  
Author(s):  
Gwan Yeong Kim ◽  
Kyu Sik Kim ◽  
Joong Cheol Park ◽  
Shae Kwang Kim ◽  
Young Ok Yoon ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
High Cycle Fatigue ◽  
Cycle Fatigue
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