🚀 go-pugleaf

In article <00962AAE.508D1DE0@vms.csd.mu.edu>,
5916rahmank@vms.csd.mu.edu (K. M. A. Rahman) writes:

|>	I like to add one more question. I have seen that, time-dependent
|>	degradation in materials is termed as 'aging'. Since degradation
|>	lead to failure, is there any substantial difference between
|>	these two terms? Or just a matter of terminology?

Actually, there are many alloys which improve with age, to a limited
extent.  Alloys which are strengthened, for example, by fine
precipitates that aren't sized effectively after a typical heat
treatment.  Aging represents the whole spectrum of long-time phase
transformation and/or growth; it doesn't mean "degradation."

Would that this were true for humans as well....

[And I'd like to put a vote in for fatigue to be defined as Kekare's
"progressive crack growth under cyclic or fluctuating loads."  A good
clean definition, and one the ceramicists would agree with if their
materials didn't all start with a bunch of pre-critical length
cracks.  Static fatigue sounds like crack propagation to me.]


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Ken Meltsner                        | meltsner@crd.ge.com (518) 387-6391
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