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Pre-twisted beam (such as a plant stem)

Fig. 2. (A) Illustration of a pre-twisted beam with morphological gradient and two-piece pre-twisted beams with different combinations of twist angles. (B) Variations of the deflections u-sub-x and u-sub-y of a four-piece pre-twisted beam [ 30, 60, 90, 120] degrees along the z axis.

From the same paper as the previous image

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