stretching lines (was Rev II stack problem solved and another question)

Everything creeps :-) Long long ago, I used to work in
the Creep Lab at the NEL (one of the most boring times 
in my career). If you put a load on something it will 
deform through an elastic stage, then through a plastic stage, 
finally to catastrophic failure. To pre-stretch I assume you
have to eliminate the elasticity. The plastic deformation will always
be there. Put a small load onto something, and leave it for some time,
and it creeps.

Patrick I-am-creeping Prosser

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