Failure Rate Model of Materials under Uncertain Constant Amplitude Cyclic Load

Failure rate is an important reliability index of mechanical components. Failure rate is usually used to characterize the degradation rule of material performance under the cyclic load, which is critical to fatigue life prediction as well as reliability assessment of Ti–6Al–2Sn–4Zr–6Mo (Ti-6246) all...

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Bibliographic Details
Published in:Metals (Basel ) 2022-07, Vol.12 (7), p.1181
Main Authors: Bai, Xuezong, Wei, Xubing, Ma, Qiang, An, Zongwen
Format: Article
Language:English
Subjects:
Amplitudes
Analysis
Component reliability
Composite materials
Cyclic loads
Dynamic testing
failure rate
Failure rates
Fatigue
Fatigue failure
fatigue life
Fatigue life assessment
Fatigue testing machines
Fatigue tests
Life prediction
Load
Materials
Mechanical components
Mechanical properties
Metal fatigue
Methods
Probabilistic models
Probability
Probability density functions
Probability distribution
Random variables
Reliability (Engineering)
Reliability analysis
S N diagrams
Statistical analysis
Stress
stress distribution
Testing
Ti-6246 alloy
Titanium alloys
Titanium base alloys
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Summary:Failure rate is an important reliability index of mechanical components. Failure rate is usually used to characterize the degradation rule of material performance under the cyclic load, which is critical to fatigue life prediction as well as reliability assessment of Ti–6Al–2Sn–4Zr–6Mo (Ti-6246) alloy. In order to reveal the probability characteristics of failure rate of Ti-6246 alloy under uncertain cyclic load, the equation of P-S-N curve is studied in this paper. Firstly. The probability density function for fatigue life under uncertain cyclic loading is derived from the probability density function for external stresses. A probabilistic model for the failure rate is then presented based on the basic assumptions. It is assumed that the failure rate and fatigue life of the material depend on the same damage state. Finally, the validity of the proposed model is verified by the Ti-6246 alloy fatigue test. The results show that the fatigue life of Ti-6246 alloy is more affected by material parameters (internal factors) than stress (external factors) under uncertain constant amplitude cyclic loading.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12071181