Abstract

Polymer thin membranes are used in a variety of deployable structures that require large areas and compact stowage. Packaging membrane structures often involves creasing the membrane along predefined fold lines to enforce the desired kinematics under folding action. Inducing permanent deformation by folding to a high curvature is a common method to create creases, particularly in the design of solar sails. The distinct mechanical characteristics at the crease regions have a profound effect on the subsequent deployment and tensioning of the membrane structures. The mechanical and geometric properties at the crease are related to the crease formation process, but the relationship is not well understood due to the presence of viscoelasticity and plasticity. This thesis seeks to investigate the relation between permanent material deformation and creasing behavior. In particular, creasing experiments are performed on polyimide thin films to identify the conditions for creasing onset. Uniaxial tension yield tests are conducted to relate material yielding with creasing onset.

Notes

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Graduation Date

2021

Semester

Fall

Advisor

Kwok, Kawai

Degree

Master of Science in Aerospace Engineering (M.S.A.E.)

College

College of Engineering and Computer Science

Department

Mechanical and Aerospace Engineering

Degree Program

Aerospace Engineering; Space System Design and Engineering

Format

application/pdf

Identifier

CFE0008795

Language

English

Release Date

December 2021

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

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