Probabilistic modeling of fatigue life distribution and size effect of components with random defects

2019 ◽  
Vol 126 ◽  
pp. 165-173 ◽  
Author(s):  
Y. Ai ◽  
S.P. Zhu ◽  
D. Liao ◽  
J.A.F.O. Correia ◽  
C. Souto ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Size Effect ◽  
Probabilistic Modeling ◽  
Life Distribution ◽  
Random Defects

Fatigue Reliability Functions in Semilogarithmic Coordinates

1991 ◽  
Author(s):  
Vladimir A. Avakov
Keyword(s):  
Fatigue Life ◽  
Coordinate System ◽  
Strength Distribution ◽  
Fatigue Reliability ◽  
Life Distribution ◽  
Similar Transformation ◽  
Asymptotic Type ◽  
Life Distributions ◽  
Strength Distributions

Abstract In the previous publication [2], the transformation between fatigue life and strength distribution was established using double-logarithmic coordinate system (lnN-lnS). Here, a similar transformation is established using a semi logarithmic (lnN-S) coordinate system. With the aid of the developed orthogonal relations, lognormal, Weibull and three-parameter logweibull life distributions have been transformed into normal, asymptotic type 1 of smallest value, and three-parameter Weibull strength distributions, respectively. This procedure may be applied to other types of fatigue life distribution.

Concrete Fatigue Life Characteristics of the Different Survival Rates in the Lateral Pressure Conditions

2012 ◽  
Vol 600 ◽  
pp. 250-255
Author(s):  
Qiang Cai ◽  
Ji Ming Kong ◽  
Ze Fu Chen
Keyword(s):  
Fatigue Life ◽  
Life Stress ◽  
Failure Modes ◽  
Survival Curve ◽  
Survival Rates ◽  
Life Distribution ◽  
Fatigue Design ◽  
Set Up ◽  
Fatigue Equation ◽  
Two Parameter

Under cyclic loading of concrete structures, fatigue failure is the main failure modes of fatigue, which has become the fatigue design of concrete structure must be considered, then the concrete fatigue studies must clarify the fatigue life of concrete under different survival curve S-N curve. Based on the statistics of the two parameter Weibull distribution theory, obtain the concrete under different survival rates of fatigue life distribution, namely to improve survival, reduce the fatigue life; stress level is reduced, the fatigue life is increased; and has set up more than 50% under different survival rates of concrete fatigue equation.

The Montecarlo Method in Application of Fatigue Life Reliability Analysis

2013 ◽  
Vol 395-396 ◽  
pp. 822-825 ◽  
Author(s):  
Yue Yang ◽  
Jia Ping Yao ◽  
Xiu Jin Yang ◽  
Zhi Bo Yang
Keyword(s):  
Fatigue Life ◽  
Integration Method ◽  
Simulation Method ◽  
Crack Size ◽  
Numerical Integration Method ◽  
Life Distribution ◽  
Deterministic Method ◽  
Montecarlo Simulation ◽  
Montecarlo Method ◽  
Fatigue Crack Propagation Life

Based on the probability theory, combined with the deterministic method for estimating the fatigue fracture mechanics, the formula was deduced to calculate the fatigue crack propagation life of examples components. The uncertainty and randomness of main assessment parameters were considered:initial crack size, practical working load,fracture toughness, mechanical intensity and coefficients. Since there are not many data, Weibull distribution was adopted to denote the life distribution of equipment approximately. A computer program was developed by using numerical integration method, and the fatigue life under given reliability and credit degree was solved. Analysis result shows that MonteCarlo simulation method can reflect objectively the uncertainty of assessment parameters and overcome the shortcomings of certainty assessment methods.

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