Stochastic modeling of fatigue crack dynamics for risk analysis and remaining life prediction

1998 ◽  
Author(s):  
A. Ray
Keyword(s):  
Fatigue Crack ◽  
Risk Analysis ◽  
Stochastic Modeling ◽  
Life Prediction ◽  
Remaining Life ◽  
Crack Dynamics

Stochastic Modeling of Fatigue Crack Damage for Risk Analysis and Remaining Life Prediction

1999 ◽  
Vol 121 (3) ◽  
pp. 386-393 ◽  
Author(s):  
Asok Ray
Keyword(s):  
Fatigue Crack ◽  
Probability Distribution Function ◽  
Life Prediction ◽  
Power Plants ◽  
Damage Model ◽  
Metallic Materials ◽  
Remaining Life ◽  
Wiener Integral ◽  
Model Predictions ◽  
Complex Mechanical Systems

This paper presents a stochastic model of fatigue crack damage in metallic materials that are commonly encountered in structures and machinery components of complex mechanical systems (e.g., aircraft, spacecraft, and power plants). The constitutive equation of the damage model is based on the physics of fracture mechanics and is validated by Karhunen-Loe`ve analysis of test data. The (nonstationary) probability distribution function (PDF) of fatigue crack damage is generated in a closed form without numerically solving stochastic differential equations in the Wiener integral or Itoˆ integral setting. The crack damage model thus allows real-time execution of decision algorithms for risk assessment and life prediction on inexpensive platforms such as a Pentium processor. The model predictions are in close agreement with experimental data of fatigue crack growth statistics for 2024-T3 and 7075-T6 aluminum alloys.

Investigation of failure mechanisms and remaining life prediction of firewater pipelines used in industrial applications

2021 ◽  
Vol 124 ◽  
pp. 105301
Author(s):  
Benyamin Piri ◽  
Rasool Amini ◽  
Erfan Asadinia ◽  
Shirin Vardak ◽  
Reza Mehdilouee ◽  
...  
Keyword(s):  
Life Prediction ◽  
Failure Mechanisms ◽  
Industrial Applications ◽  
Remaining Life
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