Further Development of Reliability Analysis Application to Structural Fatigue Evaluation

Three parameter symmetric distributions have been investigated for application as a fatigue life distribution model. Maximum likelihood (ML) estimator, and simulation procedures for maximum variance unbiased estimates and confidence bounds have been developed for analysis of censored data. A techniq...

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Bibliographic Details
Main Authors: Whittaker, I C, Saunders, S C
Format: Report
Language:English
Subjects:
Aircraft
AIRFRAMES
COMPUTERIZED SIMULATION
DISTRIBUTION FUNCTIONS
FATIGUE LIFE
FATIGUE(MECHANICS)
MATHEMATICAL MODELS
Mechanics
METAL FATIGUE
RELIABILITY
RESIDUALS
SIMULATION
STRENGTH(GENERAL)
STRUCTURAL ANALYSIS
STRUCTURAL PROPERTIES
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Summary:Three parameter symmetric distributions have been investigated for application as a fatigue life distribution model. Maximum likelihood (ML) estimator, and simulation procedures for maximum variance unbiased estimates and confidence bounds have been developed for analysis of censored data. A technique for testing the hypothesis of two censored samples having a common parent population is also presented. The effect on airplane structural reliability resulting from differing levels of fatigue performance from nominally identical structures is discussed, and a preflaw model was developed and incorporated in a reliability analysis method. Parametric studies were conducted using the reliability method to obtain qualitative information on the impact and interaction in terms of structural reliabliity, of several variables such as preflaws, loads environment, material, structural configuration, and designed residual strength.