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I am creating a simulation and am interested in pulling stretchy things and when they break, like taffy. I imagine this is a bit tougher then a simple equation like gravity, but I have no idea.

Is there a general equation for an objects threshold and pulling it apart?

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IMO you'd need a stress-strain graph for taffy. A quick internet search reveals nothing. Would be something nice to investigate, worthy of an Ig Nobel prize. –  Manishearth Feb 25 '12 at 11:49
    
look into elasticity and plasticity en.wikipedia.org/wiki/Elasticity_%28physics%29 , en.wikipedia.org/wiki/Plasticity_%28physics%29 –  anna v Feb 25 '12 at 11:54
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@annav Elasticity won't help; taffy is nearly perfectly plastic. Plasticity has no fixed equation; only stress-strain curves. –  Manishearth Feb 25 '12 at 12:46
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