Hmmmm ... isn't the phrase 'unrelieved stress' tautological? Surely all stress is unrelieved? Otherwise it wouldn't be stress?
So, surely we are simply talking about creating curves through creating stress? In which case the phrase 'dry tension' is also one word too long. 'Tension' does the job nicely all by itself. Wet-folding does not, I think, create stress. I may be wrong here since I am not a chemist but it seems to me that wetting the paper temporarily destroys the chemical bonds between the fibres in an area of the paper which then reform in a different position once the paper has been curved and is allowed to dry? Similarly with foil the paper stays curved because it is forced to by being bonded to the metal foil which does not get stressed when bent? You can also create curves by inflating a shape ... like the waterbomb, of course. I'm not sure what category these curves fall into? I am also not quite sure how curling a flap of a strip of paper works. Something within the structure of the paper must change to allow it to hold the curve ... but I'm not sure what. What's left are what I have in the past called induced curves ... but perhaps tension curves is better ... where the other parts of the paper ... or in the case of a modular design sometimes the other modules ... induce tension in the paper in response to which it curves. You can usually get rid of this tension by introducing extra creases ... and conversely its often possible to create it by taking creases away from the design. Dave
