Analysis considers statistical variation of material strength and interactions between catastrophic and failure fatigue modes. Procedure employs concepts of fracture mechanics and extreme point processes associated with stationary narrow-band random vibrations

Heer, E.

Yang, J.-N.

English

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June 1971	 Brief 71-10189 
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Analytical Procedure for Estimating Reliability of Randomly Excited Structures 
An analytical procedure for predicting the re-
liability of structures under stationary random ex-
citations has been developed. The analysis takes into 
account the statistical variation of the material 
strength, and the interactions between the catas-
trophic and fatigue failure modes, which have not 
previously been considered in random vibration 
analyses. 
The analysis employs the concepts of fracture 
mechanics and extreme point processes associated 
with stationary narrow-band random vibrations. 
Since the statistical variation of material strength 
is an important factor in determining the structural 
safety, disregarding this factor and the failure modes 
interactions yields a nonconservative estimate of 
reliability. This estimate tends to become more 
critical with increasing flaw propagation factor or 
statistical dispersion of the material strength.
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Pasadena, California 91103 
Reference: B71-10189 
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Source: Jann-Nann Yang and Ewald Heer of

Caltech/JPL
under contract to

NASA Pasadena Office

(N PO- 1 1618) 
Category 06 
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Analytical procedure for estimating reliability of randomly excited structures

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