Dynamic Control of Fiber Orientation for Additive Manufacturing via a Soft-Actuating Nozzle

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dc.contributor.advisorBigio, David Ien_US
dc.contributor.advisorSochol, Ryan Den_US
dc.contributor.authorArmstrong, Connoren_US
dc.contributor.departmentMechanical Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2019-06-20T05:45:40Z
dc.date.available2019-06-20T05:45:40Z
dc.date.issued2019en_US
dc.description.abstractRecently, additive manufacturing of fiber-reinforced composite hydrogels has been used to create self-assembling and self-folding structures through hydration-triggered shape change. Additive manufacturing of shape-changing structures has applications in spatially-limited environments such as in-vivo biological implants and components for space travel. Fiber orientation in composite hydrogels dictates the degree of anisotropic swelling deformation of hydrated structures. This thesis explores the impact of extrusion channel geometry on fiber orientation as well as the relationship between fiber orientation and swelling deformation of composite hydrogels. To study the impact of fiber orientation on swelling deformation, fiber orientation in composite hydrogels was varied using diverging extrusion dies of increasing divergence angles. It was found that increasing channel divergence angle reduced the number of fibers oriented in the direction of flow, which led to increasingly isotropic swelling deformations. To create a gradient of fiber orientations in extruded structures, an extrusion nozzle utilizing soft actuators to alter its divergence angle in real-time was developed. Hydrogels extruded through the soft-actuated dynamic nozzle exhibited similar fiber orientation and swelling behavior to those extruded through the fixed divergence angles. Spatially-varied swelling deformation characteristics promise to improve additive manufacturing of self-assembling and self-folding structures by increasing the complexity of controllable shape change geometries achievable in extruded composite polymer structures.en_US
dc.identifierhttps://doi.org/10.13016/hbxc-j7hm
dc.identifier.urihttp://hdl.handle.net/1903/22071
dc.language.isoenen_US
dc.subject.pqcontrolledMechanical engineeringen_US
dc.subject.pquncontrolled4D Printingen_US
dc.subject.pquncontrolledAdditive Manufacturingen_US
dc.subject.pquncontrolledCompositesen_US
dc.subject.pquncontrolledDirect Ink Writingen_US
dc.subject.pquncontrolledHydrogelen_US
dc.titleDynamic Control of Fiber Orientation for Additive Manufacturing via a Soft-Actuating Nozzleen_US
dc.typeThesisen_US

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