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    Effect of in-plane voiding on the fracture behavior of laser sintered polyamide

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    LEIGH-THESIS.pdf (22.34Mb)
    Date
    2011-12
    Author
    Leigh, David Keith
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    Abstract
    Laser Sintering, a method of additive manufacturing, is used in the production of concept models, functional prototypes, and end-use production parts. As the technology has transitioned from a product development tool to an accepted production technique, functional qualities have become increasingly important. Tension properties reported for popular polyamide sintering materials are comparable to the molded properties with the exception of elongation. Reported strains for laser sintered polyamide are in the 15-30% range with 200-400% strains reported for molding. (CES Edupack n.d.) The primary contributors to poor mechanical properties in polyamide materials used during Selective Laser Sintering® are studied. Methods to quantify decreased mechanical properties are compared against each other and against mechanical properties of components fabricated using multiple process parameters. Of primary interest are Ultimate Tensile Strength (UTS) and Elongation at Break (EOB) of tensile specimens fabricated under conditions that produce varying degrees of ductile and brittle fracture.
    Department
    Mechanical Engineering
    Description
    text
    Subject
    Laser sintering
    Fracture
    Additive manufacturing
    Polyamide
    SFF
    Solid freeform fabrication
    URI
    http://hdl.handle.net/2152/ETD-UT-2011-12-4609
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