<mods:mods xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-7.xsd"><mods:titleInfo><mods:title>Elastic Foam Characterization for Rate-Dependent Nonlinear Material Model Development</mods:title></mods:titleInfo><mods:name type="personal"><mods:namePart>Landauer, Alexander Kafka</mods:namePart><mods:role><mods:roleTerm type="text">creator</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart>Franck, Christian</mods:namePart><mods:role><mods:roleTerm type="text">Advisor</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart>Kim, Kyung-Suk</mods:namePart><mods:role><mods:roleTerm type="text">Reader</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart>Henann, David</mods:namePart><mods:role><mods:roleTerm type="text">Reader</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart>Wong, Ian</mods:namePart><mods:role><mods:roleTerm type="text">Reader</mods:roleTerm></mods:role></mods:name><mods:name type="corporate"><mods:namePart>Brown University. Engineering: Mechanics of Solids</mods:namePart><mods:role><mods:roleTerm type="text">sponsor</mods:roleTerm></mods:role></mods:name><mods:originInfo><mods:copyrightDate>2019</mods:copyrightDate></mods:originInfo><mods:physicalDescription><mods:extent>xviii, 143 p.</mods:extent><mods:digitalOrigin>born digital</mods:digitalOrigin></mods:physicalDescription><mods:note type="thesis">Thesis (Ph. D.)--Brown University, 2019</mods:note><mods:genre authority="aat">theses</mods:genre><mods:abstract>Elastic polymer foams are ubiquitous in cushioning, impact protection, and similar applications. Consisting of solid elastic polymer matrix and gaseous phases, elastomeric foams are classified into two major categories: open-cell and closed-cell. These structures elicit a behavior typified by tension-compression nonlinearity and asymmetry, shear-coupling, and a nonlinear Poisson's function. The compressive response characteristically displays a linear-plateau-densification stress-strain profile. Many foams are anisotropic, locally non-affine, and rate- and temperature-sensitive due to microstructural and material effects.&#13;
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A suite of experiments and tools were designed to evaluate foam behavior and inform model development. This was accomplished in three phases: first, setup and instrumentation; second, quasistatic experiments with a non-localizing, isotropic foam; and third, multi-rate experiments for viscoelasticity. The experimental platform consisted of custom load frames instrumented for digital image correlation (DIC). A new DIC algorithm, using the iterative deformation method and quality factors for cross-correlation, overcame challenges of measuring full-field strain on foam. Stress-stain and axial-transverse strain from tension and compression experiments were used to calibrate a novel continuum model co-developed with collaborators. This model was validated using shear without and with pre-compression, indentation, and inhomogeneous tension. Higher strain-rate experiments were used to calibrate time-dependency in an extended model.&#13;
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The total corpus of work includes new experimental and analysis tools and results to investigate the mechanics of elastic polymer foams, namely: a new DIC algorithm; an experimental and analytical platform for model development; and, experiments and tools for strain rates ranging from quasistatic to impact-like. These advances yield an improved workflow for characterizing, and thus utilizing, elastomeric foam in engineering applications.</mods:abstract><mods:subject authority="fast" authorityURI="http://id.worldcat.org/fast" valueURI="http://id.worldcat.org/fast/00910312"><mods:topic>Engineering</mods:topic></mods:subject><mods:subject authority="fast" authorityURI="http://id.worldcat.org/fast" valueURI="http://id.worldcat.org/fast/01013446"><mods:topic>Mechanics</mods:topic></mods:subject><mods:subject authority="fast" authorityURI="http://id.worldcat.org/fast" valueURI="http://id.worldcat.org/fast/00928480"><mods:topic>Foam</mods:topic></mods:subject><mods:subject authority="fast" authorityURI="http://id.worldcat.org/fast" valueURI="http://id.worldcat.org/fast/01011853"><mods:topic>Materials--Mechanical properties</mods:topic></mods:subject><mods:subject authority="fast" authorityURI="http://id.worldcat.org/fast" valueURI="http://id.worldcat.org/fast/01167809"><mods:topic>Viscoelastic materials</mods:topic></mods:subject><mods:subject authority="fast" authorityURI="http://id.worldcat.org/fast" valueURI="http://id.worldcat.org/fast/01013375"><mods:topic>Mechanical engineering</mods:topic></mods:subject><mods:subject authority="fast" authorityURI="http://id.worldcat.org/fast" valueURI="http://id.worldcat.org/fast/01740902"><mods:topic>Polyurethane elastomers</mods:topic></mods:subject><mods:language><mods:languageTerm authority="iso639-2b">English</mods:languageTerm></mods:language><mods:recordInfo><mods:recordContentSource authority="marcorg">RPB</mods:recordContentSource><mods:recordCreationDate encoding="iso8601">20200227</mods:recordCreationDate></mods:recordInfo><mods:identifier type="doi">10.26300/jqnk-6m25</mods:identifier><mods:accessCondition type="rights statement" xlink:href="http://rightsstatements.org/vocab/InC/1.0/">In Copyright</mods:accessCondition><mods:accessCondition type="restriction on access">Collection is open for research.</mods:accessCondition><mods:typeOfResource authority="primo">dissertations</mods:typeOfResource></mods:mods>