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Published online by Cambridge University Press: 28 July 2016
Reading the paper by Tye and Cundall in the June issue of the journal, I was started on a train of thought on the same lines.
I agree with the paper but feel that the argument has not been taken far enough. The main conclusion is:–
So long as a random failure is no more expensive and troublesome than a controlled replacement, it is always cheaper to wait until an item fails before replacing it. This is quite independent of the law of failure with time.