Predicting Fatigue Life Under Spectrum Loading in 2024-T3 Aluminum Using a Measured Initial Flaw Size Distribution

2008 ◽  
pp. 75-75-12
Author(s):  
EA DeBartolo ◽  
BM Hillberry
Keyword(s):  
Fatigue Life ◽  
Size Distribution ◽  
Flaw Size ◽  
Spectrum Loading

THEORY OF NON-DESTRUCTIVE INSPECTION OF CERAMICS BASED ON FLAW-SIZE DISTRIBUTION

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1489-1495
Author(s):  
YOHTARO MATSUO
Keyword(s):  
Stress State ◽  
Size Distribution ◽  
Flaw Size ◽  
Sufficient Condition ◽  
Necessary And Sufficient Condition ◽  
Surface Strengthening ◽  
One To One ◽  
Necessary And Sufficient ◽  
Non Destructive ◽  
Machining Damage

Two kinds of theory for non-destructive inspection of ceramics were reviewed, which were derived by the authors using flaw-size distribution. In the sufficient condition theory (Realistic NDI), we had discussed about the screening flaw-size and a screening region. In the necessary and sufficient condition theory (Ideal NDI), we found that the screening flaw-size should be changed depending on stress state and specimen configuration. It was proved that there is one-to-one correspondence between Ideal NDI and a proof test. Applications to machining damage problems and surface strengthening of ceramics were also presented.

scholarly journals Effect of Mean Stress on the Fatigue Life Prediction of Notched Fiber-Reinforced 2060 Al-Li Alloy Laminates under Spectrum Loading

2018 ◽  
Vol 2018 ◽  
pp. 1-16
Author(s):  
Weiying Meng ◽  
Liyang Xie ◽  
Yu Zhang ◽  
Yawen Wang ◽  
Xiaofang Sun ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Linear Model ◽  
Life Prediction ◽  
Piecewise Linear ◽  
Forecast Accuracy ◽  
Cyclic Stress ◽  
Fatigue Life Prediction ◽  
Fiber Reinforced ◽  
Piecewise Linear Model ◽  
Spectrum Loading

This paper presents a study on the fatigue life prediction of notched fiber-reinforced 2060 Al-Li alloy laminates under spectrum loading by applying the constant life diagram. Firstly, a review on the state of the art of constant life diagram models for the life prediction of composite materials is given, which highlights the effect on the forecast accuracy. Then, the fatigue life of notched fiber-reinforced Al-Li alloy laminates (2/1 laminates and 3/2 laminates) is tested under cyclic stress, which has different stress cycle characteristics (constant amplitude loading and Mini-Twist spectrum loading). The introduced models are successfully realized based on the available experimental data of examined laminates. In the case of Mini-Twist spectrum loading, the effect of the constant life diagram on the life prediction accuracy of examined laminates is studied based on the rainflow-counting method and Miner damage criteria. The results show that the simple Goodman model and piecewise linear model have certain advantages compared to other complex models for the life prediction of notched fiber metal laminates with different structures under Mini-Twist loading. From the engineering perspective, the S-N curve prediction based on the piecewise linear model is most applicable and accurate among all the models.

STATIC AND FATIGUE STRENGTH AND THEIR RELATIONS TO FLAW SIZE DISTRIBUTION IN CERAMICS

1992 ◽  
pp. 697-702
Author(s):  
JUNICHI KITAZUMI ◽  
YOSHIFUMI TANIGUCHI ◽  
TOSHIHIKO HOSHIDE ◽  
TOSHIRO YAMADA
Keyword(s):  
Fatigue Strength ◽  
Size Distribution ◽  
Flaw Size
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