Dataset Information

Programming curvilinear paths of flat inflatables.

ABSTRACT: Inflatable structures offer a path for light deployable structures in medicine, architecture, and aerospace. In this study, we address the challenge of programming the shape of thin sheets of high-stretching modulus cut and sealed along their edges. Internal pressure induces the inflation of the structure into a deployed shape that maximizes its volume. We focus on the shape and nonlinear mechanics of inflated rings and more generally, of any sealed curvilinear path. We rationalize the stress state of the sheet and infer the counterintuitive increase of curvature observed on inflation. In addition to the change of curvature, wrinkles patterns are observed in the region under compression in agreement with our minimal model. We finally develop a simple numerical tool to solve the inverse problem of programming any 2-dimensional (2D) curve on inflation and illustrate the application potential by moving an object along an intricate target path with a simple pressure input.

SUBMITTER: Siefert E

PROVIDER: S-EPMC6708383 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Publications

Programming curvilinear paths of flat inflatables.

Siéfert Emmanuel E Reyssat Etienne E Bico José J Roman Benoît B

Proceedings of the National Academy of Sciences of the United States of America 20190807 34

Inflatable structures offer a path for light deployable structures in medicine, architecture, and aerospace. In this study, we address the challenge of programming the shape of thin sheets of high-stretching modulus cut and sealed along their edges. Internal pressure induces the inflation of the structure into a deployed shape that maximizes its volume. We focus on the shape and nonlinear mechanics of inflated rings and more generally, of any sealed curvilinear path. We rationalize the stress st ...[more]

PMID: 31391311

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Project description:PurposeTo describe a practical, self-assembled continuous curvilinear capsulorhexis (CCC) self-training system to facilitate resident self-training and shorten the CCC learning curve.MethodsThis was a prospective experimental study that included a total of 600 capsulorhexis cases. A device for CCC practice was self-assembled and used for training and testing. Based on capsulorhexis manipulation experience, three main groups of residents (A, capsulorhexis experience with <50 cases; B, capsulorhexis experience with 400-500 cases; and C, capsulorhexis experience with >1000 cases) were created. Furthermore, based on different capsulorhexis conditions, each main group was divided into four subgroups (1, CCC without an anterior chamber cover and capsulorhexis marker; 2, CCC with an anterior chamber cover without a capsulorhexis marker; 3, CCC with an anterior chamber cover and a capsulorhexis marker; and 4, CCC with an anterior chamber cover and a capsulorhexis marker under 2.5 times magnification). Three CCC-related parameters, including acircularity index (AI), axis ratio (AR), and capsulorhexis time, were statistically evaluated.ResultsWe compared the differences in study parameters among 50 consecutively completed capsulorhexis cases by one trainee with different capsulorhexis experience in each subgroup. The CCC-related parameter values in subgroups 1 and 4 were significantly different among the three groups (P < 0.001). The capsulorhexis time in subgroup 2 was significantly different among the three groups (P < 0.001). The capsulorhexis time and AI in subgroup 3 were significantly different among the three groups (P < 0.001). Moreover, with increasing manipulation experience (from group A-C), the capsulorhexis time, the AI, and AR tended to decrease. With the help of the CCC marker, in subgroups 3 and 4, the AI and AR were closer to 1.0.ConclusionThis self-assembled CCC self-training system is practical. The CCC marker seems helpful for size specification and centration during self-training.

Dataset Information

Programming curvilinear paths of flat inflatables.

Publications

Programming curvilinear paths of flat inflatables.

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