The CP are elastic (springs, if you will). Since they are springs, they spring back to the original shape. If you want to bend them, you have to overcome the spring point and deform them. (technical terms are elastic limits, modulus of elasticity and deformation point)ROTFLOL for real!
Hmmm. I don't understand physics so I'm confused. (No surprise there.) So if it was difficult to bend does that mean it is stronger when flatter? Or is a tall bend stronger?
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Keep in mind what we are doing. We don't want the hogs to break or snap the panels, so the panels have to give (spring back = harder to break). Depending on composition and treating, you can make iron (steel) someplace between brittle or elastic. Most applications are a give and take between the 2. Brittle springs break, but springy support structure doesn't stay plumb.
Another way to visualize this. A tree sways in the wind. A tree is elastic or springy. If the tree was rigid, it would be brittle and snap off. When the tree gets to it's breaking point (past the point of spring), it does snap.
To your question, So if it was difficult to bend does that mean it is stronger when flatter?, stronger in which direction? It was made to bend. If laid flat, will sag in the middle from it's own weight. To counter the sag, you spring it upwards. Hope this helps.