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Patterns and Singularities in Elastic Shells.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Patterns and Singularities in Elastic Shells./
作者:	Niu, Lauren.
面頁冊數:	1 online resource (155 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-09, Section: B.
Contained By:	Dissertations Abstracts International84-09B.
標題:	Materials science. -
電子資源:	click for full text (PQDT)
ISBN:	9798377621416

Patterns and Singularities in Elastic Shells.
Niu, Lauren.

Patterns and Singularities in Elastic Shells. - 1 online resource (155 pages)

Source: Dissertations Abstracts International, Volume: 84-09, Section: B.

Thesis (Ph.D.)--Harvard University, 2023.

Includes bibliographical references

We describe how thin elastic shells may be patterned with generic creases, cuts, edge curvatures, and growth patterns to alter their mechanical and geometric properties. We suggest simple scaling laws for these behaviors over a wide range of geometric parameters as the shells deform in two and three dimensions, which can be used to create robust shaping mechanisms for the design of functional materials. We detail the geometry and mechanics of a thin sheet with a single cut, then describe how the behavior of sheet with a generic pattern of cuts may be approximated with a geodesic construction and present a theorem for the flat-foldability of extended cut sheets in the inextensible limit. We then discuss force scalings for idealized creases in one and two dimensions, and a curious instability that leads to twisting in straight, finite creases. Turning to the question of patterning by simple growth laws, we study the localized singularities that form on the boundaries of flat sheets subject to curvature growth, like the cusps that form at the edges of rose petals and other natural bilayer structures, and their umbilic structure. Aside from out-of-plane curvature growth, we also present results of in-plane metric growth for small patches and stripes, which lead to curious patterns of Gauss curvature and geometric features on length scales much larger than the local patterning. We conclude with a brief introduction to convex integration, where deformations generated by in-plane growth may be parameterized over different choices of surface corrugation; this suggests an outlook on elastic shell patterning as a selection problem over corrugation parameters.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798377621416Subjects--Topical Terms:

557839
Materials science.
Subjects--Index Terms:

Elastic shellsIndex Terms--Genre/Form:

554714
Electronic books.

Patterns and Singularities in Elastic Shells.
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504 $a Includes bibliographical references
520 $a We describe how thin elastic shells may be patterned with generic creases, cuts, edge curvatures, and growth patterns to alter their mechanical and geometric properties. We suggest simple scaling laws for these behaviors over a wide range of geometric parameters as the shells deform in two and three dimensions, which can be used to create robust shaping mechanisms for the design of functional materials. We detail the geometry and mechanics of a thin sheet with a single cut, then describe how the behavior of sheet with a generic pattern of cuts may be approximated with a geodesic construction and present a theorem for the flat-foldability of extended cut sheets in the inextensible limit. We then discuss force scalings for idealized creases in one and two dimensions, and a curious instability that leads to twisting in straight, finite creases. Turning to the question of patterning by simple growth laws, we study the localized singularities that form on the boundaries of flat sheets subject to curvature growth, like the cusps that form at the edges of rose petals and other natural bilayer structures, and their umbilic structure. Aside from out-of-plane curvature growth, we also present results of in-plane metric growth for small patches and stripes, which lead to curious patterns of Gauss curvature and geometric features on length scales much larger than the local patterning. We conclude with a brief introduction to convex integration, where deformations generated by in-plane growth may be parameterized over different choices of surface corrugation; this suggests an outlook on elastic shell patterning as a selection problem over corrugation parameters.
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