Abstract
In this Institute devoted to the reliability of electronic systems it is appropriate that we should spend a little time on mechanical systems because from time to time we hear comparisons drawn between the advances that have been made in understanding the reliability of electronic equipment and the relative stagnation which surrounds the reliability of mechanical equipment. Yet the fundamental basis of reliability is the same for both areas, and the differences in approach, in outlook, and in level of achievement is not always accepted. This lecture sets out to bridge the gap between these two distinctive areas and at the same time to draw attention to some special aspects of mechanical reliability. At the outset we should note that advances in the electronic field have really been made in electronic reliability and that the same factors which beset mechanical equipment also beset the mechanical reliability of electronic equipment. There would therefore seem to be some valid a priori evidence that mechanical and electronic reliability are controlled by fundamentally different factors, and not related to the approach of their respective practitioners.
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Abbreviations
- d:
-
damage in fatigue
- Ad:
-
an increment of damage in fatigue
- F(s):
-
probability density function of fatigue limit strength
- F :
-
mean fatigue limit stress
- L:
-
load
- L :
-
mean load
- L(s):
-
probability density function of load
- Ls :
-
load causing failure in single application
- m:
-
number of components
- N:
-
number of applications of load to cause fatigue failure
- Nf :
-
value of N for item of fatigue limit strength sf
- No :
-
constant in s - N equation
- Ns :
-
cycles causing fatigue failure at load Ls
- N(s - sf):
-
function giving cycles to failure at stress s
- n:
-
number of load applications
- P:
-
probability
- R:
-
reliability
- R(m):
-
reliability of a series system of m components
- R(n):
-
reliability after n repetitions of load
- S:
-
strength
- S :
-
mean strength
- S(s):
-
probability density function of strength
- s:
-
stress
- sf :
-
fatigue limit strength of an individual item
- σL :
-
standard deviation of load distribution
- σS :
-
standard deviation of strength distribution
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© 1983 Springer-Verlag Berlin Heidelberg
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Carter, A.D.S. (1983). Some Special Aspects of Mechanical Reliability. In: Skwirzynski, J.K. (eds) Electronic Systems Effectiveness and Life Cycle Costing. NATO ASI Series, vol 3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82014-4_20
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DOI: https://doi.org/10.1007/978-3-642-82014-4_20
Publisher Name: Springer, Berlin, Heidelberg
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