MFE 201 Lecture Notes - Lecture 27: Sheet Metal, Neutral Axis, Internal And External Angles
31 Mar 2016
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Document Summary
When a piece of sheet metal is bent there is a side that is in compression and one in tension. There is a line in between the two sections that is not under stress, and this is the neutral axis. If the bent part is seen sideways the top would look as the bottom gure, with the tension side slightly recessed at the center. This other method is also an approximation as the rst method shown. If the bend is made parallel to the direction of rolling, cracks are more likely to develop. Bending in other orientation prevents this. (c) cracks on the outer surface of an aluminum strip bent to an angle of 90o. Note the narrowing of the tope surface due to the poisson e ect. If bends need to be made at 90 degrees from each other, then the part should be o set at 45 degrees so no bend is parallel to the direction of rolling.
