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Static, highly nonlinear moment-rotation behavior of a long, shallow, free-edged, cylindrical shell sector (tape measure) being bent longitudinally in two opposite directions

From the same paper as the previous slide.

High-energy snapping occurs when, under the applied bending moment M, the mid-width of the tape measure with the curved cross section is under axial compression (upper two images, positive applied moment M and rotation theta).

Low-energy snapping occurs when the curved tape measure is bent in the opposite direction (bottom two images, negative applied moment M and rotation theta).

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