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Old 09-03-2009, 09:56 AM
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tdoty tdoty is offline
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Originally Posted by tdoty View Post
even though it is actually thinning the metal where the wheels meet and pushing the resulting excess metal out from the point of contact into the surrounding area.
The tucks are cause by the excess being pushed out into the rest of the panel. That is really thinning, and not stretching per se. However, it is close enough for this example.

Now, if we narrow it down into terms of stretching is an increase of the surface area combined with thinning of the base thickness of the stock, then, yeah, I concede the point.

However, I tend not to narrow things down so much.

To my mind, stretching would be moving the metal's molecules further apart while drawing as little as possible into the area of the "stretch" and not pushing them out into the rest of the sheet either.

Maybe I'm just thinking too much?

Tim D.
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